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- Porsche 955 Cayenne 3.2L V6 2003-06
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
- Porsche 957 Cayenne 3.0L Diesel 2007-10
- Porsche 957 Cayenne 3.6L 2007-10
Coolant Expansion Tank (Water Tank Reservoir)
Keep your Porsche Cayenne's cooling system operating
efficiently with this OE Match Coolant Expansion Tank (Water Tank Reservoir).
Manufactured to the original factory specification, this
direct replacement provides the
correct fit, capacity and connection points for a straightforward installation.
Fits:
- Porsche 955 Cayenne 3.2L V6 2003-06
(D9J
Engines)
- Porsche 955 Cayenne S 4.5L V8 2003-06 (T90 / T91 Engines)
- Porsche 955 Cayenne Turbo 4.5L 2003-06 (T90 / T91 Engines)
- Porsche 955 Cayenne Turbo S 4.5L 2006>> (T90 / T91 Engines)
- Porsche 957 Cayenne 3.0L Diesel 2007-10
- Porsche 957 Cayenne 3.6L 2007-10
Diagram ref no. 1
The expansion tank is a vital part of the engine cooling system, storing coolant as it expands during normal engine operation and returning it to the cooling system as temperatures decrease. Replacing a worn or leaking reservoir helps maintain the correct coolant level, prevents overheating and protects the engine from costly damage.
What Does the Coolant Expansion Tank Do?
The coolant expansion tank performs several essential functions within the engine cooling system.
Its primary roles include:
- Providing a reservoir for expanding engine coolant.
- Maintaining the correct coolant level throughout the cooling system.
- Allowing coolant to return to the radiator and engine as temperatures fall.
- Helping maintain the correct system pressure when used with the pressure cap.
- Assisting with bleeding trapped air from the cooling system.
- Providing a convenient point for checking and topping up coolant.
A correctly functioning expansion tank is essential for maintaining stable engine operating temperatures.
Why Does the Expansion Tank Fail?
Expansion tanks are subjected to constant temperature fluctuations and system pressure, which can eventually weaken the plastic housing.
Common causes of failure include:
- Age-related plastic fatigue.
- Hairline cracks caused by repeated heating and cooling cycles.
- Coolant leaks around hose connections.
- Damage caused by excessive cooling system pressure.
- Discolouration and brittleness from prolonged engine bay heat.
- Internal contamination reducing coolant quality.
A leaking or cracked expansion tank can lead to coolant loss, low system pressure and engine overheating if left unrepaired.
When Should It Be Replaced?
Replacement is recommended when:
- Coolant leaks are visible around the tank.
- The reservoir has become cracked or distorted.
- The plastic has become brittle or heavily discoloured.
- Coolant level warnings occur without any obvious hose leaks.
- The cooling system is being overhauled.
- Replacing other ageing cooling system components during preventative maintenance.
Replacing the expansion tank before it fails can help prevent overheating and reduce the risk of expensive engine repairs.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95510614723
The product you are viewing cross references to these numbers
- 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 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
Fits:
For cars with headlamp washer M288
Porsche 986 Boxster 1997-04
Porsche 996 Carrera 1998-05
Porsche 996 Turbo 2001-05
Porsche 996 GT3 2004>>
Click 'Zoom in' for large parts diagram.
Diagram ref no 1
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99652870103
The product you are viewing cross references to these numbers
- 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
fits - left or right
Fits:
Porsche 996 1998-05
Porsche 986 Boxster 1997>>
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99662833
The product you are viewing cross references to these numbers
- 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 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
- 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
Please note: If the car has a square plug you will require connector #99965019040.
Fits:
Porsche 986 Boxster 1997-04
Porsche 993 1994-98
Porsche 996 1998-05
Porsche 996 Turbo
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99662817200
The product you are viewing cross references to these numbers