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Porsche > 996 (911) (1997-2005) > Engine Cooling > Coolant Hoses and Pipes (Rear engine cars) >

Coolant Hoses - Engine Bay

Coolant Hoses - Engine Bay

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DISPLAYING 17 to 32 (of 79 products)
1 2 3 4 >>
Coolant hose, return, Left. Porsche 996 C4/C4S - 99610672806, 99610672803, 99610672802, 99610672805 - URO-004717
4
Coolant hose, return, Left. Porsche 996 C4/C4S
Special Order item
99610672806
Product Information
Product Information
Coolant hose, return, LEFT.

porsche

Fits:
Porsche 996 C4 / C4S 1998-05
All-wheel drive (option code: 339)

Click 'Zoom in' for large parts diagram.
Diagram ref no 11

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Related, superseded, cross reference or alternative numbers for comparison.

99610672806
99610672806
99610672803
99610672802
99610672805

The product you are viewing cross references to these numbers
Coolant hose, return, Left. Porsche 996 C4/C4S - 99610672806, 99610672803, 99610672805 - URO-004717, 1614300370
2
Coolant hose, return, Left. Porsche 996 C4/C4S
99610672806/1
Product Information
Product Information
Coolant hose, return, LEFT.
Left Side Return Hose, From right side radiator return pipe to under car return pipe.

oematch

Fits:
Porsche 996 C4 / C4S 1998-05
All-wheel drive (option code: 339)

Click 'Zoom in' for large parts diagram.
Diagram ref no 11

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Related, superseded, cross reference or alternative numbers for comparison.

99610672806
99610672806
99610672803
99610672805

The product you are viewing cross references to these numbers
Coolant hose, supply. Porsche 996 - 99610621253, 99610621252, 99610621253, 99610621260 - URO-004643
3
Coolant hose, supply. Porsche 996
Special Order item
99610621260
Product Information
Product Information
Coolant hose, supply.
From feed pipe.

porsche

Fits:
Porsche 996 C2 / C4 / C4S 1998-05

Click 'Zoom in' for large parts diagram.
Diagram ref no 27

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Related, superseded, cross reference or alternative numbers for comparison.

99610621260
99610621253
99610621252
99610621253
99610621260

The product you are viewing cross references to these numbers
Coolant hose, supply. Porsche 996 - 99610621253, 99610621252, 99610621253, 99610621260 - URO-004643
3
Coolant hose, supply. Porsche 996
99610621260/1
Product Information
Product Information
Coolant hose, supply.
From feed pipe.

oematch

Fits:
Porsche 996 C2 / C4 / C4S 1998-05

Click 'Zoom in' for large parts diagram.
Diagram ref no 27

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

99610621260
99610621253
99610621252
99610621253
99610621260

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Coolant hose, Supply. Porsche 996 - 99610672305, 99610672304, 99610672302
3
Coolant hose, Supply. Porsche 996
Special Order item
99610672305
Product Information
Product Information
Coolant hose, Supply. RIGHT.

porsche

Fits:
Porsche 996 Carrera 1998-05
Porsche 996 Turbo 2001-05

Click 'Zoom in' for large parts diagram.
Diagram ref no 5

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

99610672305
99610672305
99610672304
99610672302

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Coolant hose, Supply. Porsche 996 Carrera C4 / C4S - 99610672406, 99610672403, 99610672405
3
Coolant hose, Supply. Porsche 996 Carrera C4 / C4S
Special Order item
99610672406
Product Information
Product Information
Coolant hose, Supply. RIGHT.
Hose for long supply tube from engine to short tube going to radiator breather.

porsche

Fits:
Porsche 996 C4 / C4S 1998-05
All-wheel drive (option code: 339)

This product supersedes Porsche's old part numbers:
- 99610672403
- 99610672405

Click 'Zoom in' for large parts diagram.
Diagram ref no 6

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

99610672406
99610672406
99610672403
99610672405

The product you are viewing cross references to these numbers
Coolant hose, Supply. Porsche 996 Carrera C4 / C4S - 99610672406, 99610672403, 99610672405 - URO-004714
2
Coolant hose, Supply. Porsche 996 Carrera C4 / C4S
99610672406/1
Product Information
Product Information
Coolant hose, Supply. RIGHT.
Hose for long supply tube from engine to short tube going to radiator breather.

oematch

Fits:
Porsche 996 C4 / C4S 1998-05
All-wheel drive (option code: 339)

This product supersedes Porsche's old part numbers:
- 99610672403
- 99610672405

Click 'Zoom in' for large parts diagram.
Diagram ref no 6

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

99610672406
99610672406
99610672403
99610672405

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Coolant hose. Porsche 996 / 997.1 - 99710683103, 99710683102, 99610683101
3
Coolant hose. Porsche 996 / 997.1
Special Order item
99710683103
Product Information
Product Information
Coolant hose. From engine to water supply pipe.

porsche

Fits:
Porsche 996 C2 / C4 / C4S- 2002 to 2005
Porsche 997.1 C2 / C4 - 2005 to 2008
Porsche 997.1 C2S / C4S - 2005 to 2008

Click 'Zoom in' for large parts diagram.
Diagram ref no 23

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

99710683103
99710683103
99710683102
99610683101

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Coolant hose. Porsche 996 / 997.1 - 99710683103, 99710683102, 99610683101
3
Coolant hose. Porsche 996 / 997.1
99710683103/1
Product Information
Product Information
Coolant hose. 
This coolant hose is engineered to replicate the original Porsche part’s fit, material and function for the cooling system of Porsche 911 (997 series). It connects the engine to the supply pipe, ensuring proper coolant flow and stable engine temperatures under all conditions. One end fit the coolant tube the other end fits to the oil pump connecting flange 99710621600

Fits:
Porsche 996 C2 / C4 / C4S 2002 - 2005
Porsche 997.1 C2 / C4 2005 - 2008
Porsche 997.1 C2S / C4S 2005 - 2008

Diagram ref no 23

• Location: Cooling system hose, generally the engine to supply/coolant pipe connection.
• Replacement: for factory numbers 997 106 831 03 and cross-references 996 106 831 01, 997 106 831 02.
• Function:  This hose conducts coolant between the engine block and the external supply pipe (or radiator / heat exchanger) as part of the cooling circuit. Correct hose quality and routing are critical to maintaining engine temperature regulation, preventing overheating and avoiding coolant leaks.

Over time, coolant hoses can become hardened, cracked, swollen or leak due to heat cycles, pressure changes and age. A compromised hose may lead to coolant loss, engine overheating, or reduced cooling efficiency.

Replace this hose when:
•  The original shows signs of cracks, bulging, oil or coolant staining.
•  You notice coolant loss, overheating warnings or low coolant levels.
•  You are performing a cooling system overhaul or replacing related pipes/fittings.

Installing this  hose restores reliable coolant flow, proper fitment and long-term durability.

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

99710683103
99710683103
99710683102
99610683101

The product you are viewing cross references to these numbers
Coolant hose. Porsche 996 C2 / C4 3.4L - 99610650156, 99610650154, 99610650153 - URO-004670
4
Coolant hose. Porsche 996 C2 / C4 3.4L
99610650156/1
Product Information
Product Information
Coolant hose. From engine to water supply pipe.
Radiator coolant hoses are vital conduits within the engine cooling circuit. They transport engine coolant between the engine and radiator, allowing heat absorbed in the engine block to be released via the radiator.

Fits:
Porsche 996 C2 / C4 3.4L 1997 - 2005

Diagram ref no 23

Radiator coolant hose – connects radiator and engine coolant passages as part of the primary cooling loop.

Function:
• Circulates coolant between the engine and radiator
•  Helps maintain optimal operating temperatures
•  Prevents coolant leaks and pressure loss
•  Contributes to engine reliability and longevity

Radiator hoses are continuously exposed to elevated temperatures, pressure fluctuations, and corrosive coolant chemicals. Over time, hoses can weaken, crack, swell, or become brittle, leading to:
•  Fluid leaks Engine overheating
•  Loss of coolant pressure
•  Potential engine damage.
Replacing aged or damaged hoses ensures the cooling system maintains integrity, prevents leaks, and continues to operate as intended by the manufacturer.

Replace this radiator coolant hose if:
•  Visible cracking, bulging, or soft spots
•  Evidence of coolant seepage or wet residue
•  Hoses feel mushy or stiff when squeezed
•  During routine coolant service or before long-term storage
•  If coolant system overhaul is being performed

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

99610650156
99610650156
99610650154
99610650153

The product you are viewing cross references to these numbers
Coolant hose. Porsche 996 C2 2002>> - 99610684005, 99610684006, 99610684007
4
Coolant hose. Porsche 996 C2 2002>>
Special Order item
99610684007
Product Information
Product Information
Coolant hose.

porsche

Fits:
Porsche 996 C2 2002>>

Click 'Zoom in' for large parts diagram.
Diagram ref no 1

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

99610684007
99610684005
99610684006
99610684007

The product you are viewing cross references to these numbers
Coolant hose. Porsche 996 C2/ C4 3.4L - 99610650156, 99610650154, 99610650153
4
Coolant hose. Porsche 996 C2/ C4 3.4L
Special Order item
99610650156
Product Information
Product Information
Coolant hose. From engine to water supply pipe.

porsche

Fits:
Porsche 996 C2 / C4 3.4L 

Click 'Zoom in' for large parts diagram.
Diagram ref no 23

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

99610650156
99610650156
99610650154
99610650153

The product you are viewing cross references to these numbers
Coolant hose. Porsche 996 C2/ C4 3.6L - 99610683203, 99610683202, 99610683201
4
Coolant hose. Porsche 996 C2/ C4 3.6L
Special Order item
99610683203
Product Information
Product Information
Coolant hose. From engine to water supply pipe.

porsche

Fits:
Porsche 996 C2/ C4 3.6L

Click 'Zoom in' for large parts diagram.
Diagram ref no 23

Related reference numbers
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99610683203
99610683203
99610683202
99610683201

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Coolant pipe kit. billet aluminum Porsche 996 turbo / GT2 / GT3 BBi Autosport - 99710606170, 99710603990, 99710603972, 99610603973, 99610606170, 99610606174, 99631409103, 99631409102, 99711509171, 99711509172 - bbi.996.105.0001
2
Coolant pipe kit. billet aluminum Porsche 996 turbo / GT2 / GT3 BBi Autosport
BBICOOLKIT996
Product Information
Product Information
BBi Autosport billet aluminium coolant pipe repair kit.

bbi

Fits
Porsche 996 Turbo
Porsche 996 GT2
Porsche 996 GT3

These replace the glued in water pipe unions on the water pump housing, power steering pump carrier and coolant connection housing.                                   3 x unions on the water pump housing                                                                                                                                                                                                                                   2 x unions on the coolant connection housing                                                                                                                                                                                                                       1 x union on the power steering pump carrier

Coolant pipe failure is an inevitable problem with the Porsche GT1-block equipped models (GT3, GT2, Turbo).
Bonded together by adhesives, the factory pipes will eventually leak or abruptly fail. As the best preventative fix and solution for this problem, BBi Autosport offers replacement billet aluminum coolant pipes to be permanently welded in place.
Compared to the factory fittings, these replacement billet fittings offers superior metallurgy to allow stronger, higher quality welds.

Extensive surface preparation and welding skills are required to properly weld the fittings.

The engine requires removing and the necessary components disassembled and thoroughly cleaned, ideally in a ultrasonic cleaner.
Afterwards, the pipes need to be meticulously welded into place and pressure tested for leaks prior to reinstalling the engine.

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

BBICOOLKIT996
99710606170
99710603990
99710603972
99610603973
99610606170
99610606174
99631409103
99631409102
99711509171
99711509172

The product you are viewing cross references to these numbers
Coolant return water hose. Porsche 996 1998-01 3.4L C2 MANUAL - 99610664156, 99610664158, 99610664162
2
Coolant return water hose. Porsche 996 1998-01 3.4L C2 MANUAL
Special Order item
99610664162
Product Information
Product Information
Coolant return water hose
This Porsche Genuine OE Coolant Return Water Hose is a factory-engineered cooling system hose designed for the Porsche 911 (996) Carrera 3.4L models. This molded hose forms part of the engine’s water-cooling circuit and is specifically designed to route coolant through the return section of the system.

Fits:
Porsche 996 C2 3.4L 1998 - 2001 MANUAL

Diagram ref no 3

This product supersedes Porsche's old part numbers: 99610664156, 99610664158.

The coolant return hose carries coolant from the engine return line to the main distribution/return pipe within the cooling system. This circulation allows heated coolant to travel back through the system where it can be cooled and recirculated through the engine.

By maintaining steady coolant flow through the engine’s cooling circuit, the hose helps regulate engine temperature and prevent overheating during both normal driving and high-load conditions.

Functions & Technical Role
•  Coolant circulation: Transfers coolant through the return side of the cooling circuit
•  Temperature management: Supports stable engine operating temperature
•  Pressure tolerance: Built to withstand cooling system pressure and temperature fluctuations
•  Flexible connection: Absorbs engine vibration and movement within the cooling system
•  OE precision: Molded to Porsche specifications for exact routing and fitment

Fitment / Position on Car:
•   Fitting position: Engine cooling system
•   Location: Between the engine coolant return line and the main distribution/return pipe
•   System: Engine coolant circulation / radiator cooling circuit

Coolant hoses operate under constant heat, pressure, and vibration, which can cause rubber to deteriorate over time. Aging hoses may crack or weaken, increasing the risk of coolant leaks and potential engine overheating. Replacing worn hoses with genuine Porsche OE components helps maintain the reliability and efficiency of the engine cooling system.


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

99610664162
99610664156
99610664158
99610664162

The product you are viewing cross references to these numbers
Coolant return water hose. Porsche 996 1998-01 3.4L C2 MANUAL - 99610664156, 99610664158, 99610664162
2
Coolant return water hose. Porsche 996 1998-01 3.4L C2 MANUAL
99610664162/1
Product Information
Product Information
Coolant return water hose
This OE Match coolant return water hose is a cooling system hose designed for Porsche 911 (996) Carrera 3.4L models with manual transmission produced between 1998 and 2001. This hose forms part of the engine’s coolant return circuit, transferring coolant from the engine return pipe to the main cooling system distribution pipe.

Fits:
Porsche 996 C2 3.4L 1998 - 2001 MANUAL

Diagram ref no 3

This product supersedes Porsche's old part numbers: 99610664156, 99610664158.

The coolant return hose allows coolant to flow back through the engine’s cooling circuit after absorbing heat from the engine. This circulation allows the cooling system to maintain stable engine operating temperatures and prevents overheating.

A properly functioning hose ensures uninterrupted coolant flow and supports efficient temperature control.

Function
•  Coolant Return Flow: Transfers coolant from the engine return pipe to the cooling system distribution pipe
•  Temperature Regulation: Supports the engine thermostat and radiator system
•  Cooling System Integrity: Maintains sealed coolant circulation under pressure
•  Engine Protection: Helps prevent overheating and coolant leaks

Coolant hoses are constantly exposed to heat, pressure and chemical contact from coolant. Over time the rubber can harden, crack or weaken, increasing the risk of coolant leaks. Replacing ageing hoses helps maintain cooling system reliability and protects the engine from overheating or coolant loss.

When to Replace.  Consider replacing the hose when:
•   Coolant leaks are visible around hose connections
•   The hose shows cracks, swelling or deterioration
•   During cooling system overhaul or thermostat service
•   As preventative maintenance on higher-mileage engines


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

99610664162
99610664156
99610664158
99610664162

The product you are viewing cross references to these numbers
DISPLAYING 17 to 32 (of 79 products)
1 2 3 4 >>
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About Coolant Hoses - Engine Bay

Coolant Hoses – Engine Bay | Reliable Cooling for Peak Porsche Performance

Coolant hoses in the engine bay are critical components that circulate coolant between the radiator, water pump, and engine block — maintaining consistent operating temperatures and preventing overheating. These hoses carry coolant through high-pressure, high-temperature zones within the engine bay, ensuring your Porsche performs at its best, even under demanding conditions.

At Design911, we stock a wide range of genuine and manufacturer-quality engine bay coolant hoses for Porsche models including 911, Boxster, Cayman. Each hose is designed to fit perfectly, resist extreme temperatures, and deliver long-lasting performance — matching the quality, precision and reliability.

What Do Engine Bay Coolant Hoses Do?

Coolant hoses form part of your Porsche’s closed-loop cooling system. Their job is to:

  • Circulate coolant between the engine, radiator, and water pump.
  • Maintain engine temperature for optimal performance and emissions.
  • Support consistent coolant pressure during operation.
  • Prevent engine overheating and protect internal components from heat damage.

In high-performance engines, such as those found in Porsche vehicles, properly functioning hoses are essential for ensuring precise temperature control and long-term mechanical integrity.

Why Do Engine Bay Coolant Hoses Fail?

Over time, coolant hoses endure constant exposure to heat, vibration, and pressure, which can cause wear and eventual failure. Common causes include:

  • Rubber deterioration from heat cycling and coolant chemicals.
  • Cracking or hardening due to age and environmental factors.
  • Swelling or soft spots from internal coolant corrosion.
  • Leaks at connections caused by weakened hose ends or clamps.
  • Abrasion or rubbing against other engine components.

Symptoms of failure include coolant leaks, overheating, fluctuating temperature readings, or a noticeable smell of coolant in the engine bay.

Why Replace Faulty Coolant Hoses?

A damaged or leaking hose can cause rapid coolant loss and severe engine overheating. Replacing worn hoses ensures your Porsche’s cooling system functions reliably and efficiently.

Benefits of replacement include:

  • Restored coolant circulation and temperature control.
  • Prevention of leaks, overheating, and potential engine damage.
  • Improved reliability and performance under all driving conditions.
  • Manufacturer-quality construction and perfect fitment.

All hoses in this range are built using reinforced, high-grade rubber compounds designed to withstand extreme heat, pressure, and vibration — ensuring lasting durability and peace of mind.

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