Coolant Bottles / Expansion Tanks

Engine coolant expansion tank kit with sensor.
This complete cooling system refresh kit combines essential components - expansion tank, sealing cap, level sensor, and long-life antifreeze — to maintain proper engine cooling performance and fluid management over the long term.

Fits:
Porsche 986 Boxster 1997 - 2004
Porsche 987.1 Boxster 2.7L / 3.2L 2005 - 2006 (9625, 9626)

Diagram ref no 8, 11, 26, 27, 34

This OE Match kit is designed for Porsche models that use the 99610614708 expansion tank - such as Porsche Boxster 986 (1997–2004) and Boxster 987 (2005–2006). Always confirm compatibility with the exact model year and engine before purchase.

This engine coolant expansion tank kit includes four key OE Match components that work together to ensure efficient and reliable cooling system operation:
• 99610614708/1 × 1 – OE Match Coolant Expansion Tank: A precision-engineered coolant reservoir designed to replace the original plastic tank on Porsche models like the Boxster (986/987). It stores excess coolant as the engine heats and expands.
•  99610644704/1 × 1 – OE Match Expansion Tank Cap: A direct-fit pressure cap that seals the reservoir and maintains the proper cooling system pressure to optimise thermal performance.
•  00004330194 × 5 – Comma Antifreeze 1 L Red Coolant Concentrate (5-Year Long Life): High-quality antifreeze designed to be mixed with distilled water, offering excellent corrosion protection and extended service life (up to 5 years).
•  99764150300 × 1 – Coolant Level Sensor: OE Match coolant level sensor that monitors the reservoir’s fluid level and enables accurate dashboard warnings to help prevent low-coolant conditions.
This kit addresses both fluid containment and monitoring functions of the coolant system - essential for engine health and performance.

This engine cooling kit enables your vehicle’s cooling system to manage thermal expansion, maintain correct coolant levels, and monitor fluid status effectively. The expansion tank stores overflow coolant when the engine warms up and returns it to the system as it cools down. The pressure cap helps hold system pressure, which elevates boiling point and prevents boil-over. The level sensor ensures accurate monitoring, while the antifreeze helps protect against corrosion and temperature extremes.

Over time, coolant expansion tanks can crack, deform, or develop leaks due to heat cycling and material fatigue. A failing tank or cap can lead to loss of coolant, poor pressure control, and engine overheating. The level sensor can also fail or give inaccurate readings as it ages. Replacing these components with OE Match quality parts restores proper coolant containment, pressure regulation, and fluid level monitoring - helping protect the engine from thermal stress and potentially costly damage.

Replace these parts when you notice any of the following conditions:
•  Cracks or visible leaks around the expansion tank
•  Discolouration or brittleness of plastic components
•  Coolant level fluctuations without visible leaks
•  Overheating symptoms or reduced cooling performance
•  Routine coolant system maintenance interval is due

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

COOLTANKKIT986.2

The product you are viewing cross references to these numbers

Engine coolant expansion tank kit with sensor.
This kit brings together the expansion tank, cap, long-life coolant, and a coolant level sensor into one complete package.

Fits:
Porsche 986 Boxster 1997 - 2004
Porsche 987.1 Boxster 2.7L / 3.2L 2005 - 2006 (9625, 9626)

Diagram ref no 8, 11, 26, 27, 34

This Genuine Porsche kit is designed to fit Porsche vehicles that use 99610614708 as the factory coolant expansion reservoir — most commonly Porsche Boxster 986 (1997-2004) and Boxster 987 (2005-2006) models. Always verify exact model year and engine compatibility before installation.

This kit comprises high-quality Genuine Porsche cooling system components used in the thermal management and fluid monitoring aspects of your engine’s cooling circuit:
• 99610614708 × 1 – Genuine Porsche Coolant Expansion Tank: The official OEM reservoir designed to store excess engine coolant as it expands with heat. It fits precisely into the cooling system and integrates with factory mounting points.
•  99610644704 × 1 – Genuine Porsche Expansion Tank Cap: The correct factory cap for the expansion tank, engineered to maintain proper internal cooling system pressure and ensure a reliable seal under varying thermal conditions.
•  00004330515 × 5 – Genuine Porsche Long-Life Antifreeze (1 L Bottles, Red): Porsche-approved coolant concentrate that, when mixed with distilled water, delivers up to 5 years of corrosion protection, freeze/boil resistance, and thermal stability — helping safeguard vital engine components.
•  99764150300 × 1 – Genuine Porsche Coolant Level Sensor: A factory-original fluid level monitoring sensor that mounts in the expansion tank to provide accurate readings and trigger dashboard warnings if coolant drops below safe levels.
Together, these parts provide a comprehensive service solution for the coolant expansion side of your Porsche’s cooling system.

Original expansion tanks can become brittle, cracked, or discoloured over many heat cycles, leading to leaks, loss of coolant, and poor pressure stability. Failing to replace degraded components can result in engine overheating and reduced cooling system efficiency. Using Genuine Porsche parts ensures a precise match to factory standards and helps maintain consistent cooling performance and fluid integrity - protecting your engine from undue stress and potential damage.

Replace these parts when you notice any of the following conditions:
•  Cracks or visible leaks around the expansion tank
•  Discolouration or brittleness of plastic components
•  Coolant level fluctuations without visible leaks
•  Overheating symptoms or reduced cooling performance
•  Routine coolant system maintenance interval is due

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

COOLTANKKIT986.2.OE

The product you are viewing cross references to these numbers

Engine coolant expansion tank kit.
The kit combines a coolant expansion tank, a pressure cap, and long-life antifreeze concentrate to deliver a complete coolant system refresh.

Fits:
Porsche 986 Boxster 1997 - 2004
Porsche 987.1 Boxster 2.7L / 3.2L 2005 - 2006 (9625, 9626)

Diagram ref no 8, 11, 26, 27

This OE Match kit is engineered for Porsche vehicles that utilise 99610614708 style expansion tanks - most commonly fitting Porsche Boxster 986 (1997-2004) and 987 (2005-2006) models. Always verify fitment with your specific year, engine and chassis before ordering.

The engine coolant expansion tank kit includes:
• 99610614708/1 × 1 – OE Match Coolant Expansion Tank: Precisely manufactured replacement reservoir designed to match the original Porsche part used on Boxster models. It collects excess coolant as it expands under heat and releases it back into the system as it cools down.

•  99610644704/1 × 1 – OE Match Expansion Tank Cap: A direct-fit cap that seals the coolant reservoir and helps maintain proper pressure in the cooling system, aiding heat control and preventing coolant loss.

•  00004330194 × 5 – Comma Antifreeze Coolant (1 L Red, 5-Year Concentrate): Premium antifreeze concentrated coolant that, when mixed correctly with water, delivers long-lasting protection against freezing, boiling, and corrosion.

This kit brings together all the primary components you need when servicing or refreshing the coolant expansion side of your engine’s cooling system.

The expansion tank accepts expanding coolant from the radiator and engine as temperatures rise, storing it safely and helping maintain correct coolant levels. The cap seals the system and maintains the right amount of pressure, allowing the cooling system to function efficiently. The antifreeze provided offers long-term protection against corrosion, freezing and overheating - crucial to preserving engine health and reducing wear.

Over time, the original plastic tank can become brittle or crack due to heat cycling and age, which may lead to leaks, coolant loss, or air infiltration that disrupts coolant circulation. A failing pressure cap can no longer maintain correct system pressure, reducing cooling efficiency. Replacing these components with OE Match parts helps restore reliable coolant containment and pressure stability - helping prevent costly overheating and engine damage.

Replace these parts when you notice any of the following conditions:
•  Cracks or visible leaks around the expansion tank
•  Discolouration or brittleness of plastic components
•  Coolant level fluctuations without visible leaks
•  Overheating symptoms or reduced cooling performance
•  Routine coolant system maintenance interval is due

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

COOLTANKKIT986.1

The product you are viewing cross references to these numbers

Engine coolant expansion tank kit.
This kit comes with a genuine coolant expansion tank, matching cap, and multiple bottles of Porsche long-life antifreeze - everything needed to renew your cooling system’s reservoir side with components built to precise Porsche standards.

Fits:
Porsche 986 Boxster 1997 - 2004
Porsche 987.1 Boxster 2.7L / 3.2L 2005 - 2006 (9625, 9626)

Diagram ref no 8, 11, 26, 27

This Genuine Porsche kit is designed for Porsche models that use part number 99610614708 for the engine coolant expansion tank, including Porsche Boxster 986 (1997–2004) and Boxster 987 (2005–2008) vehicles. Always verify fitment with your exact model year and chassis before installation.

This engine coolant expansion tank service kit includes the key factory-designed parts used on Porsche vehicles to manage coolant expansion, system pressure, and thermal protection:
• 99610614708 × 1 – Genuine Porsche Coolant Expansion Tank: Factory-original reservoir engineered to hold excess coolant and maintain correct system balance as temperatures change.
•  99610644704 × 1 – Genuine Porsche Expansion Tank Cap: Replacement pressure cap that seals the tank and helps maintain proper cooling system pressure.
•  00004330515 × 5 – Genuine Porsche Long-Life Antifreeze (1 L Red Concentrate, 5-Year Service): Porsche-approved coolant concentrate that, when mixed with distilled water, protects against freezing, boiling and corrosion for up to five years.

Together, these genuine Porsche products deliver a factory-level coolant reservoir solution that restores proper coolant containment and thermal performance.

This kit refreshes the key components of your engine’s coolant expansion side. The expansion tank captures coolant that expands as the engine heats, preventing overflow in the system. The cap keeps the system pressurised for better heat transfer, reducing the risk of boil-over. The included long-life antifreeze provides high-level protection against freezing, overheating, and internal corrosion - vital for engine longevity and reliability

Over time, the factory expansion tank and cap can become brittle, cracked, discoloured, or weakened, which can lead to coolant loss and reduced cooling performance. Using genuine Porsche parts ensures exact fit and factory-level reliability, helping maintain stable engine temperatures and reducing the risk of overheating or internal corrosion. The long-life antifreeze included also extends protection and reduces the frequency of coolant service intervals.

Replace these parts when you notice any of the following conditions:
•  Cracks or visible leaks around the expansion tank
•  Discolouration or brittleness of plastic components
•  Coolant level fluctuations without visible leaks
•  Overheating symptoms or reduced cooling performance
•  Routine coolant system maintenance interval is due

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

COOLTANKKIT986.1.OE

The product you are viewing cross references to these numbers