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- Accessories
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- Engine Cooling
- Engine Electrical
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Thermostat / 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Related, superseded, cross reference or alternative numbers for comparison.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
The product you are viewing cross references to these numbers
- 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 3.6L 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
- 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 GT3 / GT3 RS 2007-09
- 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>>
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(*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Related, superseded, cross reference or alternative numbers for comparison.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
The product you are viewing cross references to these numbers
- 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 3.6L 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
- 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 GT3 / GT3 RS 2007-09
- 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>>
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12 Month Warranty
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Thermostat Housing – Water Coolant Housing
High-quality replacement water coolant thermostat housing designed for Porsche Cayenne 955 S and Turbo V8 models.
This component forms a critical part of the engine cooling
system, housing the thermostat and regulating coolant flow through the engine.
Proper function ensures the engine reaches and maintains optimal operating
temperature, supporting performance, efficiency, and longevity.
Fits:
- 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 6
Manufactured to OEM specifications, this thermostat housing provides precise fitment and reliable durability—ideal for addressing coolant leaks, overheating issues, or preventative maintenance.
Key Features
• Direct replacement thermostat housing
• Suitable for Porsche Cayenne 955 S and Turbo V8 models
• Houses thermostat and controls coolant flow
• OEM-style fit and performance
• Durable construction for high-temperature environments
• Ideal for repair, maintenance, or cooling system overhaul
Function and Purpose
The thermostat housing regulates coolant flow within the engine.
It helps to:
• Maintain optimal engine operating temperature
• Control coolant circulation through the system
• Prevent overheating or inefficient warm-up
• Support engine efficiency and longevity
Why Replace Your Thermostat Housing
Cooling system housings can degrade over time due to heat and pressure.
Common issues include:
• Coolant leaks from cracks or worn seals
• Warping due to heat cycles
• Faulty thermostat operation
• Overheating or inconsistent engine temperature
Replacing the housing restores proper cooling system function.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810613006
The product you are viewing cross references to these numbers
- 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>>
Shop Securely
12 Month Warranty
Worldwide Delivery
Thermostat Housing – Water Coolant Housing
High-quality replacement water coolant thermostat housing designed for Porsche Cayenne 955 S and Turbo V8 models.
This component forms a critical part of the engine cooling
system, housing the thermostat and regulating coolant flow through the engine.
Proper function ensures the engine reaches and maintains optimal operating
temperature, supporting performance, efficiency, and longevity.
Fits:
- 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 6
Manufactured to OEM specifications, this thermostat housing provides precise fitment and reliable durability—ideal for addressing coolant leaks, overheating issues, or preventative maintenance.
Key Features
• Direct replacement thermostat housing
• Suitable for Porsche Cayenne 955 S and Turbo V8 models
• Houses thermostat and controls coolant flow
• OEM-style fit and performance
• Durable construction for high-temperature environments
• Ideal for repair, maintenance, or cooling system overhaul
Function and Purpose
The thermostat housing regulates coolant flow within the engine.
It helps to:
• Maintain optimal engine operating temperature
• Control coolant circulation through the system
• Prevent overheating or inefficient warm-up
• Support engine efficiency and longevity
Why Replace Your Thermostat Housing
Cooling system housings can degrade over time due to heat and pressure.
Common issues include:
• Coolant leaks from cracks or worn seals
• Warping due to heat cycles
• Faulty thermostat operation
• Overheating or inconsistent engine temperature
Replacing the housing restores proper cooling system function.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810613006
The product you are viewing cross references to these numbers
- 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>>
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 955 Cayenne S 4.5L 2003-06
Porsche 955 Cayenne TURBO 4.5L 2003-06
Click 'Zoom in' for large parts diagram.
Diagram ref no. 8
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94860620301
The product you are viewing cross references to these numbers
- 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>>
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 955 Cayenne S 4.5L 2003-06
Porsche 955 Cayenne TURBO 4.5L 2003-06
Click 'Zoom in' for large parts diagram.
Diagram ref no. 8
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94860620301
The product you are viewing cross references to these numbers
- 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>>
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 955 Cayenne S 4.5L 2003-06
Porsche 955 Cayenne TURBO 4.5L 2003-06
Click 'Zoom in' for large parts diagram.
Diagram ref no. 8
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94860620301
The product you are viewing cross references to these numbers
- 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>>
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 955 Cayenne S 4.5L V8
Porsche 955 Cayenne Turbo 4.5L
Click 'Zoom in' for large parts diagram.
Diagram Ref No 9.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810612303
The product you are viewing cross references to these numbers
- 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>>
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 955 Cayenne S 4.5L V8
Porsche 955 Cayenne Turbo 4.5L
Click 'Zoom in' for large parts diagram.
Diagram Ref No 9.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810612303
The product you are viewing cross references to these numbers
- 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>>
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 955 Cayenne S 4.5L V8 2003-06
Porsche 955 Cayenne Turbo 4.5L 2003-06
Click 'Zoom in' for large parts diagram.
Diagram Ref No 11.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810640101
The product you are viewing cross references to these numbers
- 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>>
Shop Securely
12 Month Warranty
Worldwide Delivery
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
The product you are viewing cross references to these numbers
- Porsche 996 TURBO 2000-05
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MKII GT3 / GT3 RS 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>>
Shop Securely
12 Month Warranty
Worldwide Delivery
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
The product you are viewing cross references to these numbers
- Porsche 996 TURBO 2000-05
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MKII GT3 / GT3 RS 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>>
Shop Securely
12 Month Warranty
Worldwide Delivery
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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