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Porsche > 997 (911) MK1 2005-2008 > 997 MK1 GT3 / GT3 RS 2007-09 > Engine Cooling >

Thermostat / Temperature Sensor

Thermostat / Temperature Sensor

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DISPLAYING 1 to 13 (of 13 products)
Coolant temperature sensor. Porsche Boxster 986 2.7 & 3.2L / 996 3.6L / 996 Turbo / 997 / 955 Cayenne S & Turbo - 99660641000, 847603076908
3
Coolant temperature sensor. Porsche Boxster 986 2.7 & 3.2L / 996 3.6L / 996 Turbo / 997 / 955 Cayenne S & Turbo
Special Order item
99660641000
Product Information
Product Information
Coolant temperature sensor. 

(*on Porsche 996 Turbo there is also an additional of same the sensor used for Oil temperature)

Fits:
Porsche 986 Boxster 2.7L & 3.2L - for Coolant temperature
Porsche 996 Carrera 3.6L - for Coolant temperature
Porsche 996 Turbo - for Coolant & Oil temperature*
Porsche 996 GT3 - for Coolant temperature
Porsche 997 2005-08 -for Coolant temperature
Porsche 997 GT3 - for Coolant temperature
Porsche 955 Cayenne S & Turbo - Coolant temperature

Diagram Ref No 29.



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Related, superseded, cross reference or alternative numbers for comparison.

99660641000
99660641000
847603076908

The product you are viewing cross references to these numbers
Coolant temperature sensor. Porsche Boxster 986 2.7L & 3.2L / 996 / 996 Turbo / 997 / 955 Cayenne S & Turbo - 99660641000, 847603076908 - URO-011373, 1693100200
3
Coolant temperature sensor. Porsche Boxster 986 2.7L & 3.2L / 996 / 996 Turbo / 997 / 955 Cayenne S & Turbo
99660641000/1
Product Information
Product Information
Coolant temperature sensor. 

(*on Porsche 996 Turbo there is also an additional of same the sensor used for Oil temperature)

Fits:
Porsche 986 Boxster 2.7L, 3.2L - for Coolant temperature
Porsche 996 Carrera 3.6L - for Coolant temperature
Porsche 996 Turbo - for Coolant & Oil temperature*
Porsche 996 GT3 - for Coolant temperature
Porsche 997 2005-08 -for Coolant temperature
Porsche 997 GT3 - for Coolant temperature
Porsche 955 Cayenne S & Turbo - Coolant temperature

Diagram ref no 29

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Related, superseded, cross reference or alternative numbers for comparison.

99660641000
99660641000
847603076908

The product you are viewing cross references to these numbers
Coolant Thermostat Housing. Porsche 996 Turbo / 997 Turbo / GT3 - 99610612172, 99610612171
2
Coolant Thermostat Housing. Porsche 996 Turbo / 997 Turbo / GT3
Special Order item
99610612172
Product Information
Product Information
Coolant Thermostat Housing.
porsche

Fits:
Porsche 996 Turbo / GT2 2001-05
Porsche 996 GT3 / GT3 RS 2000-05
Porsche 997 Turbo / GT2 / GT2 RS 2007-11
Porsche 997 GT3 2007-09

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

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

99610612172
99610612172
99610612171

The product you are viewing cross references to these numbers
Oil level and oil temperature sensor. Porsche Boxster 986 / Boxster 987 / Cayman 987C / 997 / 996 - 99660614000, 99660614001, 99660614002
2
Oil level and oil temperature sensor. Porsche Boxster 986 / Boxster 987 / Cayman 987C / 997 / 996
Special Order item
99660614002
Product Information
Product Information
Oil level & oil temperature sensor

porsche

Fits:
Porsche 996 Turbo 2001-05
Porsche 997 Turbo MKI & MKII 2007>>
Porsche Carrera GT 2004-06
Porsche 996 GT3 3.6L 2000-05
Porsche 997 GT3 3.6L 2007-09
Porsche 997 GT3 3.8L / 4.0L 2010>>

Click 'Zoom in' for large parts diagram.
Diagram Ref No 15.

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

99660614002
99660614000
99660614001
99660614002

The product you are viewing cross references to these numbers
Oil level and oil temperature sensor. Porsche Boxster 986 / Boxster 987 / Cayman 987C / 997 / 996 - 99660614000, 99660614001, 99660614002
2
Oil level and oil temperature sensor. Porsche Boxster 986 / Boxster 987 / Cayman 987C / 997 / 996
99660614002/1
Product Information
Product Information
Oil level & oil temperature sensor.

oematch

Fits:
Porsche 996 Turbo 2001-05
Porsche 997 Turbo MKI & MKII 2007>>
Porsche Carrera GT 2004-06
Porsche 996 GT3 3.6L 2000-05
Porsche 997 GT3 3.6L 2007-09
Porsche 997 GT3 3.8L / 4.0L 2010>>

Click 'Zoom in' for large parts diagram.
Diagram Ref No 15.

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

99660614002
99660614000
99660614001
99660614002

The product you are viewing cross references to these numbers
Water pump thermostat insert. Porsche 997 GT3 3.8L / 4.0L - 9A110622590, 9GT121113
5
Water pump thermostat insert. Porsche 997 GT3 3.8L / 4.0L
Special Order item
9GT121113
Product Information
Product Information
Water pump thermostat insert.

Fits:
Porsche 997 GT3 3.8L 2009 - 2011
Porsche 997 GT3 4.0L 2010 - 2011

Diagram Ref No 8

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

9GT121113
9A110622590
9GT121113

The product you are viewing cross references to these numbers
Water Pump Thermostat Insert. Porsche 997 GT3 3.8L / 4.0L - 9A110622590, 9GT121113 - 411678.03.81D70
2
Water Pump Thermostat Insert. Porsche 997 GT3 3.8L / 4.0L
9GT121113/1
Product Information
Product Information
Water Pump Thermostat Insert.

The Wahler Water Pump Thermostat Insert is a Porsche 997 GT3 cooling system component designed to regulate coolant flow through the engine and radiator system. Installed within the thermostat or water pump housing, this insert opens and closes at specific temperatures to ensure the engine maintains its ideal operating range for efficiency, performance, and reliability.

Fits:

  • Porsche 997 MK1 GT3 2007-09
  • Porsche 997 MKII GT3 2010-11 

Diagram Ref No 8 

What This Product Does:
  • Regulates coolant circulation through the engine cooling system
  • Maintains optimal engine operating temperature
  • Controls engine warm-up and cooling efficiency
  • Works with the water pump and radiator to stabilise temperatures
  • Helps prevent overheating and overcooling
  • Supports fuel efficiency, emissions control, and engine performance

Symptoms Of Wear Or Failure:
  • Engine overheating Engine running too cool or slow to reach operating temperature
  • Fluctuating temperature gauge readings
  • Poor cabin heater performance
  • Coolant leaks around the thermostat housing
  • Reduced fuel efficiency caused by incorrect engine temperature
  • Check engine light related to cooling system faults  

Why Replacement Matters:
  • Restores proper coolant flow and temperature regulation
  • Prevents overheating and potential engine damage
  • Improves engine efficiency and fuel economy
  • Ensures reliable heating and climate control performance
  • Protects cooling system components from excessive stress and wear
  • Maintains long-term engine reliability and performance



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

9GT121113
9A110622590
9GT121113

The product you are viewing cross references to these numbers
Water thermostat gasket. Porsche 996 Turbo / 997 Turbo - 99610632671, 99610632670, 237.871, 237.870
2
Water thermostat gasket. Porsche 996 Turbo / 997 Turbo
Special Order item
99610632671
Product Information
Product Information
Water thermostat gasket

porsche

Fits:
Porsche 996 Turbo 2000-05
Porsche 996 GT3 1999-05
Porsche 997.1 Turbo 2007-09
Porsche 997.2 Turbo 2010-13
Porsche 997 GT3 2006-09

Click 'Zoom in' for large parts diagram.
Diagram ref no 8

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

99610632671
99610632671
99610632670
237.871
237.870

The product you are viewing cross references to these numbers
Water thermostat gasket. Porsche 996 Turbo / 997 Turbo - 99610632671, 99610632670, 237.871, 237.870
2
Water thermostat gasket. Porsche 996 Turbo / 997 Turbo
99610632671/1
Product Information
Product Information
Water thermostat gasket

elring

Fits:
Porsche 996 Turbo 2000-05
Porsche 996 GT3 1999-05
Porsche 997.1 Turbo 2007-09
Porsche 997.2 Turbo 2010-13
Porsche 997 GT3 2006-09

Click 'Zoom in' for large parts diagram.
Diagram ref no 8

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

99610632671
99610632671
99610632670
237.871
237.870

The product you are viewing cross references to these numbers
Water Thermostat Insert. Porsche 986 / 987 Boxster / 996 / 997 - 99610612553, 99610612552, 99610612554 - 4202.04.83D70
2
Water Thermostat Insert. Porsche 986 / 987 Boxster / 996 / 997
99610612554/2
Product Information
Product Information
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
Related, superseded, cross reference or alternative numbers for comparison.

99610612554
99610612553
99610612552
99610612554

The product you are viewing cross references to these numbers
Water Thermostat Insert. Porsche 996 Turbo / 997 TT & GT3 / 955 Cayenne - 99610612570, 99610612571, 99610612572, 99610612573 - 7307.04.83D70
2
Water Thermostat Insert. Porsche 996 Turbo / 997 TT & GT3 / 955 Cayenne
99610612573/1
Product Information
Product Information
Water Thermostat Insert.

This Wahler Water Thermostat Insert is a Porsche 996 Turbo / 997 TT & GT3 / 955 Cayenne cooling system component designed to regulate coolant flow and maintain the engine at its optimal operating temperature. Installed within the thermostat housing, this insert automatically opens and closes according to coolant temperature, controlling circulation between the engine and radiator for efficient thermal management.

Fits:

  • Porsche 996 TURBO 2000-05
  • Porsche 997 MK1 GT3 2007-09
  • Porsche 997 MKII GT3 2010-11
  • Porsche 997 MKII Turbo 2010-13
  • Porsche 997 MKII GT2 RS 2011-13
  • 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>>  

Diagram Ref No 7

What This Product Does:
  • Regulates coolant flow through the cooling system
  • Maintains optimal engine operating temperature
  • Controls engine warm-up and cooling efficiency
  • Helps prevent overheating and overcooling
  • Supports fuel efficiency, emissions control, and engine performance
  • Works with the radiator and water pump to maintain stable temperatures  

Symptoms Of Wear Or Failure:
  • Engine overheating Engine running too cool or taking too long to warm up
  • Fluctuating temperature gauge readings
  • Poor cabin heater performance
  • Coolant leaks near the thermostat housing
  • Reduced fuel efficiency caused by incorrect operating temperature
  • Check engine light related to cooling system faults  

Why Replacement Matters:
  • Restores proper coolant circulation and temperature regulation
  • Prevents overheating and potential engine damage
  • Improves engine efficiency and fuel economy
  • Ensures reliable heater and climate control operation
  • Protects cooling system components from excessive stress and wear
  • Maintains long-term engine reliability and performance



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

99610612573
99610612570
99610612571
99610612572
99610612573

The product you are viewing cross references to these numbers
Water Thermostat Porsche 996 Turbo / 997 TT & GT3 / 955 Cayenne - 99610612570, 99610612571, 99610612572, 99610612573
4
Water Thermostat Porsche 996 Turbo / 997 TT & GT3 / 955 Cayenne
Special Order item
99610612573
Product Information
Product Information
Water Thermostat insert

Fits:
Porsche 996 Turbo

Porsche 997.2 Turbo
Porsche 997.2 GT3  
Porsche 955 Cayenne S / Turbo 4.8L


Diagram Ref No 6.



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

99610612573
99610612570
99610612571
99610612572
99610612573

The product you are viewing cross references to these numbers
Water thermostat. Porsche 986 Boxster / 996 / 987 Boxster / 997 - 99610612553, 996.106.125.53, 99610612552, 99610612554
4
Water thermostat. Porsche 986 Boxster / 996 / 987 Boxster / 997
Special Order item
99610612554
Product Information
Product Information
Water thermostat insert

porsche

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
99610612553
996.106.125.53
99610612552
99610612554

The product you are viewing cross references to these numbers
DISPLAYING 1 to 13 (of 13 products)
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About Thermostat / Temperature Sensor

Engine Thermostats & Temperature Sensors – Precision Cooling Control for Porsche Performance

Engine thermostats and temperature sensors are essential components in your Porsche’s cooling system. Together, they regulate and monitor engine temperature to ensure optimal performance, efficiency, and reliability. The thermostat controls coolant flow through the radiator, while the temperature sensor communicates vital data to the vehicle’s ECU - helping to maintain the perfect balance between power and protection.

At Design911, we supply a wide range of genuine and high-quality thermostats and temperature sensors for Porsche models including transaxle cars, 911, Boxster, Cayman, Cayenne, Macan, and Panamera. Each part is engineered to precise standards for seamless integration, fast response, and long-lasting accuracy - ensuring your Porsche performs at its peak in all conditions.

What Do Engine Thermostats & Temperature Sensors Do?

These components work hand-in-hand to manage and monitor your Porsche’s engine temperature:

  • Thermostat: Opens and closes to regulate coolant flow between the engine and radiator.
  • Temperature Sensor: Measures coolant or cylinder head temperature and sends data to the ECU to control fans, fuel mixture, and performance parameters.
  • Together: They maintain optimal operating temperatures, prevent overheating, and ensure efficient combustion and emissions control.

Without a properly functioning thermostat or temperature sensor, your engine can overheat, run inefficiently, or suffer from poor fuel economy.

Why Do Thermostats & Temperature Sensors Fail?

These components operate under constant thermal stress and can degrade over time. Common causes of failure include:

  • Thermostat sticking open or closed due to corrosion or wear.
  • Sensor degradation from prolonged exposure to coolant and heat.
  • Electrical faults or corrosion in wiring and connectors.
  • Contamination from old or incorrect coolant types.
  • Age-related fatigue causing inaccurate readings or slow response.

Symptoms of failure include fluctuating engine temperatures, warning lights, poor heating performance, or inconsistent fuel economy.

Why Replace Faulty Thermostats & Temperature Sensors?

A malfunctioning thermostat or temperature sensor can severely impact cooling efficiency and engine safety. Replacing worn or faulty parts restores accurate temperature control and helps prevent costly engine damage.

Benefits of replacement include:

  • Stable engine operating temperature.
  • Improved performance and fuel efficiency.
  • Prevention of overheating or over-cooling.
  • Manufacturer-quality construction for accuracy and durability.

All thermostats and sensors in this range are built to meet or exceed exacting standards, offering precise calibration, corrosion-resistant materials, and reliable long-term operation.

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