Expansion Tank Hoses

Coolant Return Hose.

The Porsche Coolant Return Hose 95810655050 is a genuine replacement cooling-system hose designed for Porsche Cayenne 958 applications.

Fits:

• Porsche 958 Cayenne V6 3.6L Petrol (300Hp) 2010-17
• Porsche 958 Cayenne S V8 4.8L Petrol (400Hp) 2010-17
• Porsche 958 Cayenne GTS V8 4.8L Petrol (400Hp) 2010-17
• Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
• Porsche 958 Cayenne Turbo S V8 4.8L Petrol (550Hp) 2010-17  

Diagram Ref No 17

The hose forms part of the engine cooling circuit, carrying coolant between the expansion tank, radiator and associated coolant pipework. By providing a sealed return path, it helps maintain continuous coolant circulation and stable engine operating temperatures.

Manufactured to Porsche specifications, this replacement hose restores the original routing, connection points and cooling-system integrity when the existing hose has become cracked, hardened, swollen or is leaking.

What This Product Does:
The engine cooling system continuously circulates coolant to absorb heat from the engine and release it through the radiator.

The return hose forms part of this circulation loop and allows coolant to flow back through the system after passing through cooling-system components.

Its main functions include:

• Carrying coolant through the return side of the cooling circuit
• Maintaining continuous coolant circulation
• Helping maintain correct cooling-system pressure
• Supporting stable engine operating temperatures
• Providing a sealed connection between cooling-system components
• Helping prevent coolant loss
• Maintaining the original factory coolant routing
• Supporting efficient engine heat management

The hose itself does not cool the engine directly, but uninterrupted coolant flow through it is essential for the cooling system to work correctly.

Symptoms Of Wear Or Failure:
Coolant hoses are continually exposed to heat, pressure, vibration and chemical contact with engine coolant. Over time, the hose material and connections can deteriorate.

Common symptoms that may indicate replacement is required include:

• Visible coolant leaks
• Dampness around the hose or connections
• Pink, white or coloured coolant residue around joints
• Cracks or splits in the hose
• Swollen or bulging sections
• Hose becoming unusually soft or spongy
• Rubber becoming hard or brittle
• Low coolant warning message
• Repeated need to top up the coolant
• Sweet coolant smell from the engine bay
• Engine temperature running higher than normal
• Fluctuating coolant temperature
• Steam from the engine compartment in severe cases
• Damage or leakage around quick-connect fittings

A low coolant level or overheating can also result from leaks elsewhere in the cooling system, so the complete circuit should be inspected.

Why Replacement Matters:
The cooling system must remain sealed and properly pressurised to control engine temperature effectively.

If the coolant return hose develops a leak, coolant can escape and the system may gradually lose pressure. As the coolant level drops, the engine's ability to transfer and dissipate heat is reduced.

A small leak can quickly become more serious if an ageing hose splits under operating pressure.

Continued driving with insufficient coolant can cause:

• Engine overheating
• Cylinder-head or head-gasket damage
• Damage to seals and cooling-system components
• Reduced engine reliability
• Breakdown caused by sudden coolant loss

Replacing a deteriorated hose helps restore:

• Correct coolant circulation
• Proper cooling-system pressure
• A leak-free cooling circuit
• Stable engine temperature
• Reliable long-term cooling-system operation

Replacing the hose at the first signs of cracking, swelling or leakage can help prevent a relatively inexpensive hose fault from developing into a much more costly overheating problem.

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

95810655050

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Coolant Vent Hose.

The Coolant Vent Hose is a genuine Porsche cooling system component designed to vent trapped air from the cooling circuit and maintain stable coolant circulation. This hose plays an important role in ensuring the cooling system remains properly bled, pressurised, and operating efficiently.

Fits:

• Porsche 958 Cayenne V6 3.6L Petrol (300Hp) 2010-17

Diagram Ref No 20

What This Product Does:

• Allowing trapped air to escape from the coolant system
• Helping prevent air pockets that reduce cooling efficiency
• Supporting stable coolant flow and system pressure
• Improving cooling system bleeding and circulation
• Reducing the risk of overheating caused by trapped air

Symptoms Of Wear Or Failure:

• Coolant leaks around the vent hose connections
• Cracks, splits, or brittle hose material
• Coolant smell from the engine bay
• Low coolant warning light or repeated coolant loss
• Overheating or fluctuating temperature readings
• Difficulty bleeding the cooling system
• Coolant residue or staining near hose joints

Why Replacement Matters:

• Maintain correct cooling system pressure
• Prevent air pockets and coolant circulation issues
• Avoid overheating and costly engine damage
• Restore leak-free operation and system reliability
• Ensure proper cooling system bleeding performance

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

95810642210

The product you are viewing cross references to these numbers

Coolant Vent Hose.

The Coolant Vent Hose is a OE MATCH cooling system component designed to vent trapped air from the cooling circuit and maintain stable coolant circulation. This hose plays an important role in ensuring the cooling system remains properly bled, pressurised, and operating efficiently.

Fits:

• Porsche 958 Cayenne V6 3.6L Petrol (300Hp) 2010-17

Diagram Ref No 20

What This Product Does:

• Allowing trapped air to escape from the coolant system
• Helping prevent air pockets that reduce cooling efficiency
• Supporting stable coolant flow and system pressure
• Improving cooling system bleeding and circulation
• Reducing the risk of overheating caused by trapped air

Symptoms Of Wear Or Failure:

• Coolant leaks around the vent hose connections
• Cracks, splits, or brittle hose material
• Coolant smell from the engine bay
• Low coolant warning light or repeated coolant loss
• Overheating or fluctuating temperature readings
• Difficulty bleeding the cooling system
• Coolant residue or staining near hose joints

Why Replacement Matters:

• Maintain correct cooling system pressure
• Prevent air pockets and coolant circulation issues
• Avoid overheating and costly engine damage
• Restore leak-free operation and system reliability
• Ensure proper cooling system bleeding performance

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

95810642210

The product you are viewing cross references to these numbers

Engine coolant overflow hose.



Fits:
Porsche 958 Cayenne 3.0L Diesel 2012-18

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

Related reference numbers
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95810645200

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Plastic coolant pipe – this intermediate piece connects the thermostat housing to the hose leading to the expansion tank. 

Fits:
Porsche 958 Cayenne 3.6L V6 2011-18

Diagram ref. 18.

Related reference numbers
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95810602200

The product you are viewing cross references to these numbers

Vent hose water coolant. 



Fits:
Porsche 958 Cayenne S / GTS 4.8ltr V8 - 2010 to 2017
Porsche 958 Cayenne turbo / turbo S - 2010 to 2017

Click 'Zoom in' for large parts diagram.
Diagram ref no 9

Related reference numbers
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95810631101

The product you are viewing cross references to these numbers

Vent hose water coolant. 



Fits:
Porsche 958 Cayenne S / GTS 4.8ltr V8 - 2010 to 2017
Porsche 958 Cayenne turbo / turbo S - 2010 to 2017

Click 'Zoom in' for large parts diagram.
Diagram ref no 9

Related reference numbers
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95810631101

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Water coolant hose. 



Fits:
Porsche 958 Cayenne S / GTS 4.8ltr V8 - 2010 to 2017
Porsche 958 Cayenne turbo / turbo S - 2010 to 2017

Click 'Zoom in' for large parts diagram.
Diagram ref no 17

Related reference numbers
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95810626101

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Water coolant hose. 



Fits:
Porsche 958 Cayenne S / GTS 4.8ltr V8 - 2010 to 2017
Porsche 958 Cayenne turbo / turbo S - 2010 to 2017

Click 'Zoom in' for large parts diagram.
Diagram ref no 17

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95810626101

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Water coolant pipe
This is a Genuine Porsche water coolant pipe, also described as a water inlet pipe, engine coolant pipe, coolant tube or cooling water tube - designed for the Porsche Cayenne 958 / 92A platform and is used within the engine cooling system on selected 3.6L petrol and 3.0L diesel models.

Fits:
Porsche 958 Cayenne 3.6L V6 2011 - 2018
Porsche 958 Cayenne 3.0L Diesel 2011 - 2018

Diagram ref no 26

This pipe fits in the engine cooling system of the Porsche Cayenne 958. It is used as part of the water inlet / coolant pipework assembly, routing coolant through the engine bay cooling circuit. Depending on engine version and specification, it may be shown in Porsche diagrams under coolant pipe, water cooling, coolant reservoir or water inlet pipe sections.

It helps maintain correct coolant routing, supports engine cooling performance and is ideal for replacing leaking, damaged or ageing coolant pipework during cooling system repairs.

Functions
•  Routes engine coolant through the cooling system
•  Provides a factory-correct coolant pipe connection
•  Helps maintain correct coolant flow between cooling system components
•  Supports engine temperature control and cooling efficiency
•  Helps prevent coolant leaks when fitted with correct seals and connections
•  Maintains OE Porsche fitment and hose/pipe routing
•  Suitable for replacement during coolant system repair, water pump work or engine cooling maintenance.

Why Replace This Part?
Coolant pipes are exposed to heat cycles, engine vibration, coolant pressure and ageing. Over time, the pipe can become brittle, cracked, corroded, blocked or start to leak at its connection points. A damaged coolant pipe can cause coolant loss, reduced cooling efficiency and potential overheating. Replacing it with a Genuine Porsche OE coolant pipe helps restore the original cooling system layout, correct fitment and reliable coolant circulation.

When to replace
•   If coolant is leaking from the pipe or connection points
•   If the pipe is cracked, brittle, damaged or corroded
•   During cooling system repairs or coolant hose replacement
•   When replacing related components such as the water pump, thermostat or coolant reservoir connections
•   If the cooling system is losing pressure
•   If the engine shows signs of overheating caused by coolant loss
•   During preventative maintenance on higher-mileage vehicles.

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

95810631110

The product you are viewing cross references to these numbers

Water coolant pipe
This OE Match water coolant pipe is a replacement cooling system pipe for Porsche 958 Cayenne models with 3.6L petrol and 3.0L diesel engines. It is designed to match the original-style fitment and helps carry coolant through the engine cooling circuit.

Fits:
Porsche 958 Cayenne 3.6L V6 2011 - 2018
Porsche 958 Cayenne 3.0L Diesel 2011 - 2018

Diagram ref no 26

The coolant pipe transfers engine coolant between cooling system components, helping regulate engine temperature and maintain reliable coolant circulation. A properly sealed coolant pipe helps prevent coolant loss, overheating, and pressure issues within the cooling system.

Functions
• Transfers coolant through the engine cooling system
• Helps maintain correct engine operating temperature
• Supports reliable coolant circulation
• Helps prevent coolant leaks and pressure loss
• Connects cooling system components as part of the coolant pipework
• Replaces cracked, leaking, brittle, or damaged original pipework
• OE Match replacement for correct fit and cooling system performance

Why Replace This Part?
Coolant pipes are exposed to heat cycles, coolant pressure, vibration, and age-related wear. Over time, the pipe can become brittle, cracked, warped, corroded, or begin leaking at the connection points. A damaged coolant pipe can lead to coolant loss, overheating, warning lights, or reduced cooling system reliability. Replacing it helps restore secure coolant flow and protects the engine from overheating damage.

When to replace
•   Coolant is leaking from the pipe or connection points
•   The pipe is cracked, brittle, warped, corroded, or damaged
•   Coolant residue or staining is visible around the pipe
•   The engine coolant level drops without an obvious cause
•   The vehicle shows overheating or coolant warning messages
•   The cooling system is being pressure-tested or repaired
•   The water pump, thermostat, radiator hose, or coolant system components are being serviced
•   As preventative maintenance during major cooling system work.

Where it fits on the car
This coolant pipe fits in the engine bay as part of the coolant circulation system. It connects cooling system components and helps route coolant through the engine cooling circuit. Exact mounting position may vary depending on whether the vehicle is fitted with the 3.6L petrol or 3.0L diesel engine.

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

95810631110

The product you are viewing cross references to these numbers