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99610615704/2
Product Information
The engine coolant expansion reservoir - a pressure-compensating overflow reservoir that collects excess coolant as the engine warms up and coolant expands, then returns coolant to the system as it cools down. It acts as a buffer to maintain correct coolant volume, system pressure, and prevent overflow or air ingress.
Fits:
Porsche 996 3.6L C2 / C4 / C4S 2001 - 2005
Porsche 996 Turbo 2001 - 2005
Porsche 996 GT2 2001 - 2005
Porsche 996 GT3 MKII / GT3 RS 2001 - 2005
Porsche 997.1 2005 - 2008 all models
Porsche 997.2 2009 - 2012 all models
This product supersedes Porsche's old part numbers:
- 99610615700, 99610615701, 99610615702, 99610615703, 99610615704
Over time, coolant expansion tanks are prone to degradation due to heat cycles, coolant chemical exposure, and pressure stress.
This can lead to:
• Cracks or stress fractures in the plastic tank body
• Leaks that cause coolant loss and risk of overheating or engine damage
• Loss of system pressure regulation, leading to air ingress, coolant boiling, or inefficient cooling
• Difficulty reading coolant level due to opaque or discolored plastic
Replacing the reservoir with a correctly-spec’ed tank ensures:
• Leak-free coolant containment under all operating conditions
• Proper coolant volume management through expansion and contraction cycles
• Stable cooling-system pressure and reliable thermal regulation
• Long-term reliability and prevention of coolant-related engine issues
You should replace the coolant expansion tank if you see cracks, coolant leaks, or coolant residue around or under the tank, especially after long periods of heat. If the plastic has become brittle, discoloured, or feels soft/warped, or if coolant level fluctuate without obvious cause — the tank may no longer maintain pressure or hold coolant reliably, and replacement is warranted.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610615704
The product you are viewing cross references to these numbers
Product Information
Coolant bottle. Cap included.The engine coolant expansion reservoir - a pressure-compensating overflow reservoir that collects excess coolant as the engine warms up and coolant expands, then returns coolant to the system as it cools down. It acts as a buffer to maintain correct coolant volume, system pressure, and prevent overflow or air ingress.
Fits:
Porsche 996 3.6L C2 / C4 / C4S 2001 - 2005
Porsche 996 Turbo 2001 - 2005
Porsche 996 GT2 2001 - 2005
Porsche 996 GT3 MKII / GT3 RS 2001 - 2005
Porsche 997.1 2005 - 2008 all models
Porsche 997.2 2009 - 2012 all models
This product supersedes Porsche's old part numbers:
- 99610615700, 99610615701, 99610615702, 99610615703, 99610615704
Over time, coolant expansion tanks are prone to degradation due to heat cycles, coolant chemical exposure, and pressure stress.
This can lead to:
• Cracks or stress fractures in the plastic tank body
• Leaks that cause coolant loss and risk of overheating or engine damage
• Loss of system pressure regulation, leading to air ingress, coolant boiling, or inefficient cooling
• Difficulty reading coolant level due to opaque or discolored plastic
Replacing the reservoir with a correctly-spec’ed tank ensures:
• Leak-free coolant containment under all operating conditions
• Proper coolant volume management through expansion and contraction cycles
• Stable cooling-system pressure and reliable thermal regulation
• Long-term reliability and prevention of coolant-related engine issues
You should replace the coolant expansion tank if you see cracks, coolant leaks, or coolant residue around or under the tank, especially after long periods of heat. If the plastic has become brittle, discoloured, or feels soft/warped, or if coolant level fluctuate without obvious cause — the tank may no longer maintain pressure or hold coolant reliably, and replacement is warranted.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610615704
99610615703
99610615704
99610615700
99610615701
99610615702
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 2010-11
- Porsche 997 MKII Turbo 2010-13
£72.50 inc. VAT
Now £65.25 inc. VAT
In Stock - 24 Hour Dispatch
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12 Month Warranty
Worldwide Delivery
99610615704/1
Product Information
Fits:
Porsche 996 3.6L C2 / C4 / C4S 2001 - 2005
Porsche 996 Turbo 2001 - 2005
Porsche 996 GT2 2001 - 2005
Porsche 996 GT3 MKII / GT3 RS 2001 - 2005
Porsche 997.1 2005 - 2008 all models
Porsche 997.2 2009 - 2012 all models
This product supersedes Porsche's old part numbers:
- 99610615700, 99610615701, 99610615702, 99610615703, 99610615704
Every car has its weak points, and although the Boxster and 996 has very few, one of the items to keep an eye on is the coolant recovery tank. Over time it becomes brittle and has a tendency to crack and leak coolant into the rear trunk area in the Boxster. A simple preventative measure is to replace your tank with a genuine Porsche recovery tank.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610615704
The product you are viewing cross references to these numbers
Product Information
Coolant bottleFits:
Porsche 996 3.6L C2 / C4 / C4S 2001 - 2005
Porsche 996 Turbo 2001 - 2005
Porsche 996 GT2 2001 - 2005
Porsche 996 GT3 MKII / GT3 RS 2001 - 2005
Porsche 997.1 2005 - 2008 all models
Porsche 997.2 2009 - 2012 all models
This product supersedes Porsche's old part numbers:
- 99610615700, 99610615701, 99610615702, 99610615703, 99610615704
Every car has its weak points, and although the Boxster and 996 has very few, one of the items to keep an eye on is the coolant recovery tank. Over time it becomes brittle and has a tendency to crack and leak coolant into the rear trunk area in the Boxster. A simple preventative measure is to replace your tank with a genuine Porsche recovery tank.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610615704
99610615703
99610615704
99610615700
99610615701
99610615702
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 2010-11
- Porsche 997 MKII Turbo 2010-13
Price: £85.00 inc. VAT
In Stock - 24 Hour Dispatch
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12 Month Warranty
Worldwide Delivery
99610615704
Product Information
The Genuine Porsche coolant expansion tank is the factory-specified reservoir used in the cooling system of Porsche 911 (996) and 997 models. This tank provides the correct fluid volume, pressure stability, and thermal expansion control required to maintain safe and efficient engine cooling. Manufactured to Porsche’s exacting standards, it ensures perfect fitment, correct hose connection points, accurate coolant-level visibility, and long service life even under continuous heat cycling.
Fits:
Porsche 996 3.6L C2 / C4 / C4S 2001 - 2005
Porsche 996 Turbo 2001 - 2005
Porsche 996 GT2 2001 - 2005
Porsche 996 GT3 MKII / GT3 RS 2001 - 2005
Porsche 997.1 2005 - 2008 all models
Porsche 997.2 2009 - 2012 all models
Every car has its weak points, and although the Boxster and 996 has very few, one of the items to keep an eye on is the coolant recovery tank. Over time it becomes brittle and has a tendency to crack and leak coolant into the rear trunk area in the Boxster. A simple preventative measure is to replace your tank with a genuine Porsche recovery tank.
This product supersedes Porsche's old part numbers:
- 99610615700, 99610615701, 99610615702, 99610615703, 99610615704
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610615704
The product you are viewing cross references to these numbers
Product Information
Coolant bottle.The Genuine Porsche coolant expansion tank is the factory-specified reservoir used in the cooling system of Porsche 911 (996) and 997 models. This tank provides the correct fluid volume, pressure stability, and thermal expansion control required to maintain safe and efficient engine cooling. Manufactured to Porsche’s exacting standards, it ensures perfect fitment, correct hose connection points, accurate coolant-level visibility, and long service life even under continuous heat cycling.
Fits:
Porsche 996 3.6L C2 / C4 / C4S 2001 - 2005
Porsche 996 Turbo 2001 - 2005
Porsche 996 GT2 2001 - 2005
Porsche 996 GT3 MKII / GT3 RS 2001 - 2005
Porsche 997.1 2005 - 2008 all models
Porsche 997.2 2009 - 2012 all models
Every car has its weak points, and although the Boxster and 996 has very few, one of the items to keep an eye on is the coolant recovery tank. Over time it becomes brittle and has a tendency to crack and leak coolant into the rear trunk area in the Boxster. A simple preventative measure is to replace your tank with a genuine Porsche recovery tank.
This product supersedes Porsche's old part numbers:
- 99610615700, 99610615701, 99610615702, 99610615703, 99610615704
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610615704
99610615703
99610615704
99610615700
99610615701
99610615702
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 2010-11
- Porsche 997 MKII Turbo 2010-13
Price: £220.82 inc. VAT
In Stock - 24 Hour Dispatch
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12 Month Warranty
Worldwide Delivery
99610614756/1
Product Information
Also called a coolant reservoir bottle, that’s responsible for collecting excess engine coolant and maintaining proper fluid levels within the cooling system as temperatures change.
Fits:
Porsche 996 C2 / C4 1997 - 2000
Porsche 996 GT3 MKI 1997 - 2000
Diagram ref no 1
The expansion tank allows coolant to expand as it heats up and then returns it back to the cooling system once the engine cools, helping maintain correct pressure and fluid volume. It also provides a convenient point for coolant level checks and top-ups when needed.
Function:
• Pressure/regulation: Manages thermal expansion of coolant to prevent overheating or coolant loss.
• Containment: Acts as a buffer to capture overflow and maintain stable coolant levels as the engine cycles through temperature changes.
• Durability: Engineered from heat-resistant materials that withstand prolonged thermal and mechanical stresses.
Over time, factory coolant expansion tanks become brittle and can develop cracks, leaks, or deformation due to heat cycles and coolant chemicals. A compromised reservoir can lead to coolant loss, loss of system pressure, and overheating - which in turn can damage your engine if ignored. Replacing tank restores proper coolant containment and helps preserve engine reliability and longevity.
Replace your coolant expansion tank if you observe any of the following:
• Visible cracks, leaks or coolant seepage around the tank.
• Coolant levels that fluctuate unexpectedly.
• Plastic has become brittle, discoloured, warped or swollen.
• Pressure issues or frequent coolant top-ups are required.
• Any signs of coolant residue or stains around the engine bay.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610614756
The product you are viewing cross references to these numbers
Product Information
Coolant expansion tank bottle. Also called a coolant reservoir bottle, that’s responsible for collecting excess engine coolant and maintaining proper fluid levels within the cooling system as temperatures change.
Fits:
Porsche 996 C2 / C4 1997 - 2000
Porsche 996 GT3 MKI 1997 - 2000
Diagram ref no 1
The expansion tank allows coolant to expand as it heats up and then returns it back to the cooling system once the engine cools, helping maintain correct pressure and fluid volume. It also provides a convenient point for coolant level checks and top-ups when needed.
Function:
• Pressure/regulation: Manages thermal expansion of coolant to prevent overheating or coolant loss.
• Containment: Acts as a buffer to capture overflow and maintain stable coolant levels as the engine cycles through temperature changes.
• Durability: Engineered from heat-resistant materials that withstand prolonged thermal and mechanical stresses.
Over time, factory coolant expansion tanks become brittle and can develop cracks, leaks, or deformation due to heat cycles and coolant chemicals. A compromised reservoir can lead to coolant loss, loss of system pressure, and overheating - which in turn can damage your engine if ignored. Replacing tank restores proper coolant containment and helps preserve engine reliability and longevity.
Replace your coolant expansion tank if you observe any of the following:
• Visible cracks, leaks or coolant seepage around the tank.
• Coolant levels that fluctuate unexpectedly.
• Plastic has become brittle, discoloured, warped or swollen.
• Pressure issues or frequent coolant top-ups are required.
• Any signs of coolant residue or stains around the engine bay.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610614756
99610614753
99610614754
99610614755
99610614756
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 GT3 MKI 1999-02
£62.50 inc. VAT
Now £56.25 inc. VAT
In Stock - 24 Hour Dispatch
Shop Securely
12 Month Warranty
Worldwide Delivery
99610614756
Product Information
Fits:
Porsche 996 C2 / C4 1997-2000
Porsche 996 GT3 MKI 1997-2000
Every car has its weak points, and although the Boxster and 996 has very few, one of the items to keep an eye on is the coolant recovery tank. Over time it becomes brittle and has a tendency to crack and leak coolant into the rear trunk area in the Boxster. A simple preventative measure is to replace your tank with a genuine Porsche recovery tank.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610614756
The product you are viewing cross references to these numbers
Product Information
Coolant expansion tank bottle.Fits:
Porsche 996 C2 / C4 1997-2000
Porsche 996 GT3 MKI 1997-2000
Every car has its weak points, and although the Boxster and 996 has very few, one of the items to keep an eye on is the coolant recovery tank. Over time it becomes brittle and has a tendency to crack and leak coolant into the rear trunk area in the Boxster. A simple preventative measure is to replace your tank with a genuine Porsche recovery tank.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610614756
99610614753
99610614754
99610614755
99610614756
2140258
56959
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 GT3 MKI 1999-02
Price: £605.29 inc. VAT
Orderable - 14 to 28 Days
Shop Securely
12 Month Warranty
Worldwide Delivery
99610644704/1
Product Information
This coolant expansion tank cap is a direct replacement for Porsche 996 (1998–2005) and also fits Boxster (986/987), Cayman, and 997 models, upgrading earlier versions with improved sealing and pressure control.
Fits:
Porsche 996 1998 - 2005
Porsche 997.1 2005 - 2008
Porsche 986 Boxster 1997 - 2004
Porsche 987.1 Boxster 2005 - 2008
Porsche 987C.1 Cayman 2005 - 2008
Diagram ref no 5
This cap serves as the pressure seal for the coolant expansion tank, keeping the cooling system at the correct pressure. It regulates venting to the overflow reservoir, preventing blowback, leaks, and overpressure while helping avoid coolant loss, boiling, and overheating.
It replaces earlier versions: 99610644700, 99610644701, 99610644702, 99610644703
Why replacement matters:
• An old or worn cap may fail to hold pressure, causing coolant to boil, vaporize, or overflow
• A bad cap can allow air to enter the cooling system, leading to overheating, hot spots, or poor cooling performance
• A leaking or weak cap can lead to gradual coolant loss, requiring refills and risking engine damage
Installing an OE-Match version restores proper pressure control, reliable sealing, and helps maintain engine temperature stability.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610644704
The product you are viewing cross references to these numbers
Product Information
Replacement Coolant reservoir / expansion tank cap.This coolant expansion tank cap is a direct replacement for Porsche 996 (1998–2005) and also fits Boxster (986/987), Cayman, and 997 models, upgrading earlier versions with improved sealing and pressure control.
Fits:
Porsche 996 1998 - 2005
Porsche 997.1 2005 - 2008
Porsche 986 Boxster 1997 - 2004
Porsche 987.1 Boxster 2005 - 2008
Porsche 987C.1 Cayman 2005 - 2008
Diagram ref no 5
This cap serves as the pressure seal for the coolant expansion tank, keeping the cooling system at the correct pressure. It regulates venting to the overflow reservoir, preventing blowback, leaks, and overpressure while helping avoid coolant loss, boiling, and overheating.
It replaces earlier versions: 99610644700, 99610644701, 99610644702, 99610644703
Why replacement matters:
• An old or worn cap may fail to hold pressure, causing coolant to boil, vaporize, or overflow
• A bad cap can allow air to enter the cooling system, leading to overheating, hot spots, or poor cooling performance
• A leaking or weak cap can lead to gradual coolant loss, requiring refills and risking engine damage
Installing an OE-Match version restores proper pressure control, reliable sealing, and helps maintain engine temperature stability.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610644704
99610644704
99610644703
99610644702
99610644701
99610644700
171121321D
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
£12.95 inc. VAT
Now £11.65 inc. VAT
In Stock - 24 Hour Dispatch
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12 Month Warranty
Worldwide Delivery
99610629705
Product Information
The Porsche Drain Hose for Coolant Reservoir is a genuine OEM component that ensures your cooling system operates efficiently under all conditions. This hose connects the coolant reservoir to the overflow system, allowing excess coolant to safely flow into the expansion tank when system pressure rises.
What This Product Does:
This hose functions as a drain / overflow path in the cooling system. When coolant pressure or volume is high (due to heat, expansion), excess coolant flows into the reservoir or overflow tank via this hose.
Symptoms / Signs Of A Faulty / Damaged Hose:
Why Replacement Matters:
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610629705
The product you are viewing cross references to these numbers
Product Information
Drain Hose For Coolant Reservoir.The Porsche Drain Hose for Coolant Reservoir is a genuine OEM component that ensures your cooling system operates efficiently under all conditions. This hose connects the coolant reservoir to the overflow system, allowing excess coolant to safely flow into the expansion tank when system pressure rises.
Fits:
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 997 Carrera 2 3.6L 2005-08
- Porsche 997 Carrera 2S 3.8L 2005-08
- Porsche 997 Carrera 4 3.6L 2005-08
- Porsche 997 Carrera 4S 3.8L 2005-08
- Porsche 997 TURBO 2007-09
- Porsche 997 GT3 2007-09
- Porsche 997 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
What This Product Does:
This hose functions as a drain / overflow path in the cooling system. When coolant pressure or volume is high (due to heat, expansion), excess coolant flows into the reservoir or overflow tank via this hose.
Symptoms / Signs Of A Faulty / Damaged Hose:
- Coolant leaks (weeping or dripping) around the reservoir, hose connection points, or under the car.
- Overheating or fluctuating temperatures, if coolant isn’t flowing properly or the overflow path is blocked.
- Loss of coolant in the reservoir over time, without other visible leaks.
- A hose that is cracked, brittle, perished, or has collapsed (blocking flow).
- Bubbling or gurgling noises in the cooling system or reservoir due to trapped air or improper overflow.
- Overflow tank that doesn’t fill or returns little coolant on cooling — i.e., the system is not cycling properly through the reservoir.
Why Replacement Matters:
- Ensures the overflow system works correctly — letting excess coolant go to the reservoir instead of causing pressure issues or spillage.
- Prevents coolant loss or leaks, which can lead to engine damage from low coolant or overheating.
- Maintains system pressure balance, which is critical in modern closed-loop cooling systems for proper pump flow and temperature control.
- Avoids damage to other parts — a leaking hose can spray coolant onto other components (belts, wiring, bodywork) causing corrosion or damage.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610629705
99610629705
99610629704
99610629700
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
Price: £10.88 inc. VAT
In Stock - 24 Hour Dispatch
Shop Securely
12 Month Warranty
Worldwide Delivery
99970737040
Product Information
Fits:
Porsche 996 1998-05
Porsche 997 MKI 2005>>
Porsche 986 Boxster 1997-04
Porsche 987 Boxster 2005>>
Porsche 987C Cayman 2005>>
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Diagram ref no 11
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99970737040
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Product Information
Rubber O-Ring for Bleeder Valve. Larger 47 x 4.Fits:
Porsche 996 1998-05
Porsche 997 MKI 2005>>
Porsche 986 Boxster 1997-04
Porsche 987 Boxster 2005>>
Porsche 987C Cayman 2005>>
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Diagram ref no 11
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Related, superseded, cross reference or alternative numbers for comparison.
99970737040
99610634702
99610634701
99610634700
99970737040
99970737140
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Vehicle Group
Vehicle Group
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
Price: £2.80 inc. VAT
In Stock - 24 Hour Dispatch
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99970737140
Product Information
Fits:
Porsche 996 1998-05
Porsche 997 MKI 2005>>
Porsche 986 Boxster 1997-04
Porsche 987 Boxster 2005>>
Porsche 987C Cayman 2005>>
Click 'Zoom in' for large parts diagram.
Diagram ref no 12
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99970737140
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Product Information
Rubber O-Ring for Bleeder Valve. Smaller 17 x 4Fits:
Porsche 996 1998-05
Porsche 997 MKI 2005>>
Porsche 986 Boxster 1997-04
Porsche 987 Boxster 2005>>
Porsche 987C Cayman 2005>>
Click 'Zoom in' for large parts diagram.
Diagram ref no 12
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99970737140
99610634702
99610634701
99610634700
99970737040
99970737140
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
Price: £4.47 inc. VAT
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99610640552
Product Information
Fits:
Porsche 996 Carrera 2002>>2005
Porsche 997.1 Carrera MKI 2005>>2008
Porsche 997.1 Turbo / GT2 MKI 2007>>2009
Porsche 997.1 GT3 MKI 2007>>2008
Related reference numbers
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99610640552
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Product Information
Support Bracket For Coolant Reservoir.Fits:
Porsche 996 Carrera 2002>>2005
Porsche 997.1 Carrera MKI 2005>>2008
Porsche 997.1 Turbo / GT2 MKI 2007>>2009
Porsche 997.1 GT3 MKI 2007>>2008
Porsche 997.2 Carrera MKII 2009>>2012
Porsche 997.2 Turbo / GT2 RS MKII 2009>>2013
Porsche 997.2 GT3 MKII 2010>>2012
Diagram Ref No 6
Related reference numbers
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99610640552
99610640552
99610640551
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Vehicle Group
Vehicle Group
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
Price: £27.67 inc. VAT
In Stock - 24 Hour Dispatch
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12 Month Warranty
Worldwide Delivery
99652860500
Product Information
Fits:
Porsche 986 Boxster 1997-04
Porsche 996 1998-05
Porsche 996 Turbo 2001-05
Porsche 996 GT3 1999-05
Porsche Carrera GT 2003-06
Click 'Zoom in' for large parts diagram.
Diagram ref no 3
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99652860500
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Product Information
Windscreen water reservoir filler neck. Fits:
Porsche 986 Boxster 1997-04
Porsche 996 1998-05
Porsche 996 Turbo 2001-05
Porsche 996 GT3 1999-05
Porsche Carrera GT 2003-06
Click 'Zoom in' for large parts diagram.
Diagram ref no 3
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99652860500
99652860500
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche Carrera GT
Price: £23.62 inc. VAT
Orderable - 14 to 28 Days
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Also found on these pages
-
water cooling - 4 - for 996 CARRERA 2/4/4S M96.01/02/03/04 1998-05 105-20
-
windscreen washer system 996 1998-05 904-10
-
water cooling - 4 - for 996 TURBO 2001-05 105-20
-
windscreen washer system 996 TURBO 2001-05 904-10
-
water cooling 4 for 996 GT3-1 M96.76 2000-01 and 996 GT3-1/GT3 RS M96.79 2004-05 105-20
-
windscreen washer system 996 GT3-1 1999-05 904-10
About Coolant Bottles / Expansion Tanks
Coolant Bottles / Expansion Tanks – Reliable Cooling Performance for Porsche Vehicles
Coolant bottles (also known as expansion tanks) are a vital part of your Porsche’s cooling system. They store excess coolant and manage pressure fluctuations as the engine heats up and cools down. By maintaining proper coolant levels and system pressure, they help prevent overheating, engine damage, and coolant loss - ensuring optimal performance and reliability.
At Design911, we offer a complete range of genuine and quality coolant bottles and expansion tanks for Porsche models including 911, Boxster, Cayman, Cayenne, Macan, and Panamera. Each tank is designed to deliver exact fitment, superior material strength, and long-term resistance to heat and pressure - matching the quality and precision of factory components.
What Do Coolant Bottles / Expansion Tanks Do?
The coolant bottle or expansion tank works as part of a
sealed cooling system to:
- Store
and regulate excess coolant as temperatures and pressure fluctuate.
- Maintain
consistent pressure to prevent overheating or boiling.
- Allow
coolant recovery as the system cools, keeping the radiator full.
- Provide a visible level indicator to monitor coolant condition and volume.
A properly functioning expansion tank ensures your engine operates at a stable temperature, improving efficiency and extending engine life.
Why Do Coolant Bottles Fail?
Coolant bottles are constantly exposed to heat, vibration,
and pressure, which can cause degradation over time. Common causes of failure
include:
- Plastic
fatigue or cracking from thermal cycling.
- Coolant
leaks around seams, caps, or hose connections.
- Discolouration
or brittleness from age and coolant exposure.
- Faulty
pressure caps leading to loss of system pressure.
- Corrosion or contamination inside the tank.
Symptoms of a failing coolant bottle include visible coolant leaks, low coolant warnings, overheating, or pressure loss within the cooling system.
Why Replace Faulty Coolant Bottles / Expansion Tanks?
A damaged or leaking expansion tank can quickly lead to overheating, engine damage, or complete cooling system failure. Replacing it ensures safe, efficient operation and protects vital engine components.
Benefits of replacement include:
- Restored coolant capacity and pressure stability.
- Prevention of leaks and overheating.
- Enhanced cooling system reliability and engine protection.
- Factory-spec construction with manufacturer-level durability.
All replacement tanks are designed to meet or exceed factory standards using high-grade materials that resist cracking, corrosion, and deformation under extreme conditions
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