Thermostat / Temperature Sensor

Water temperature sensor.



Fits:
Porsche 986 Boxster 2.5L 1997-99
Porsche 996 >>2001

Click 'Zoom in' for large parts diagram.
Diagram Ref No 29.

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99660640501

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Water Thermostat Housing With Thermostat Insert And Gasket.
Standard Temperature 83 °C
The OE Match Water Thermostat Housing with Thermostat Insert and Gasket is a complete replacement cooling system assembly designed to regulate engine coolant flow and maintain the optimum operating temperature. Supplied with a standard temperature 83°C thermostat insert and sealing gasket, this OE-quality assembly provides a direct replacement solution for worn or faulty thermostat housings.

Fits:

• 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 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 Cayman 2.7L 987C 2006-08
• Porsche Cayman S 3.4L 987C 2005-08  

Diagram Ref No 5

Manufactured to OE specifications for fit, durability and cooling performance, the assembly features a precision-engineered thermostat housed within a robust, heat-resistant housing. The thermostat remains closed during engine warm-up to allow the engine to reach its correct operating temperature quickly before opening at approximately 83°C to allow coolant to circulate through the radiator, preventing overheating while maintaining efficient engine operation.

What This Product Does:

• Regulates coolant flow throughout the engine cooling system.
• Opens at approximately 83°C to maintain the correct engine operating temperature.
• Speeds up engine warm-up after a cold start.
• Prevents engine overheating during normal operation.
• Improves fuel efficiency by maintaining optimum engine temperature.
• Supports efficient cabin heater performance.
• Includes a new housing, thermostat insert and gasket for a complete installation.

Symptoms Of Wear Or Failure:

• Engine overheating.
• Engine taking an unusually long time to reach operating temperature.
• Fluctuating temperature gauge readings.
• Coolant leaks around the thermostat housing.
• Low coolant level warnings.
• Poor cabin heater performance.
• Engine running too hot or too cold.
• Illuminated engine or cooling system warning lights.
• Visible cracks or damage to the thermostat housing.
• Increased fuel consumption caused by incorrect engine temperature.

Why Replacement Matters:

• The thermostat and housing are essential components of the engine cooling system and are continuously exposed to heat cycles, coolant pressure and engine vibration. Over time, the thermostat can stick open or closed, while the housing and seals may deteriorate or develop leaks.
• A thermostat that remains closed can quickly cause engine overheating, while one that remains open prevents the engine from reaching its correct operating temperature. Both conditions reduce engine efficiency, increase fuel consumption and can lead to premature engine wear. Coolant leaks from a damaged housing can also result in coolant loss and severe engine damage if left unresolved.
• Replacing the complete thermostat housing assembly with a new thermostat insert and gasket restores correct coolant regulation, improves engine efficiency and protects against overheating. An OE Match replacement provides factory-style fitment, reliable temperature control and long-lasting durability, helping maintain the performance, reliability and longevity expected from your Porsche.

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99610601361

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Water Thermostat Insert.

This Water Thermostat Insert is a Porsche 986 / 987 / 996 / 997 cooling system component designed to regulate engine coolant flow and maintain optimal operating temperature. Installed within the thermostat housing, the insert opens and closes according to coolant temperature, controlling circulation between the engine and radiator.

Fits:

• 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 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

Diagram Ref No 6  

What This Product Does:

• Regulates coolant flow through the engine cooling system
• Maintains optimal engine operating temperature
• Controls engine warm-up and cooling efficiency
• Helps prevent overheating or overcooling
• Supports fuel efficiency and emissions performance

Symptoms Of Wear Or Failure:

• Engine overheating
• Engine running too cool or taking too long to warm up
• Fluctuating engine temperature readings
• Poor heater performance inside the cabin
• Coolant leaks around the thermostat housing
• Reduced fuel efficiency due to improper temperature regulation  

Why Replacement Matters:

• Restores proper coolant flow and temperature control
• Prevents overheating and potential engine damage
• Improves engine efficiency and fuel economy
• Supports correct heater and climate control operation
• Ensures long-term reliability of the cooling system and engine operation  

Related reference numbers
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99610612554

The product you are viewing cross references to these numbers

160F / 71°C Low Temperature  Water Thermostat with Insert  for 986 as well as 996 models and replaces the factory 186F thermostat insert, Porsche part numbers 996 106 125 52 (53). Also fits 987 and 997 models to 2008. Does not fit MY09+ DFI engines.

Fits:
Porsche 986 Boxster 1997 - 2004
Porsche 996 C2, C4
Porsche 987 Boxster 2005>>
Porsche 997 2005 - 2008

Installation recommended only by trained Porsche technician or Porsche service department using genuine Porsche coolant.

Diagram Ref No 5, 6

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

99610601361

The product you are viewing cross references to these numbers

160F Low Temperature Thermostat HOUSING WITH INSERT & Gasket for 986 as well as 996 models and replaces the factory 186F thermostat insert, Porsche part numbers 996 106 125 52 (53). Also fits 987 and 997 models to 2008. Does not fit MY09+ DFI engines.

Fits:
Porsche 986 Boxster 1997-2004
Porsche 996 C2, C4
Porsche 987 Boxster 2005>>
Porsche 997 2005-08

Price includes new low temperature thermostat insert manufactured in Germany by one of the same manufacturers that makes the oe thermostat insert, allowing you to reuse your original housing. Provides increased cooling capacity increasing power while ensuring consistent performance and extending engine-component longevity.

Installation recommended only by trained Porsche technician or Porsche service department using genuine Porsche coolant.

Click 'Zoom in' for large parts diagram.
Diagram Ref No 5, 6 & 7

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

99610601361

The product you are viewing cross references to these numbers

160F Low Temperature Thermostat housing without gasket / seal for 986 as well as 996 models and replaces the factory 186F thermostat insert, Porsche part numbers 996 106 125 52 (53). Also fits 987 and 997 models to 2008. Does not fit MY09+ DFI engines.

Fits:
Porsche 986 Boxster 1997-2004
Porsche 996 C2, C4
Porsche 987 Boxster 2005>>
Porsche 997 2005-08

Price includes new low temperature thermostat insert manufactured in Germany by one of the same manufacturers that makes the oe thermostat insert, allowing you to reuse your original housing. Provides increased cooling capacity increasing power while ensuring consistent performance and extending engine-component longevity.

Installation recommended only by trained Porsche technician or Porsche service department using genuine Porsche coolant.

Diagram Ref No 5, 6

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

99610601361

The product you are viewing cross references to these numbers

Water thermostat insert



Fits:
Porsche 986 Boxster 1997-2004
Porsche 996 C2, C4, GT3
Porsche 987 Boxster 2005>>
Porsche 997 2005-08

Click 'Zoom in' for large parts diagram.
Diagram Ref No 6.

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

99610612554

The product you are viewing cross references to these numbers