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Porsche // Macan (95B) MK1 (2014-2018) // Any
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- Porsche Boxster 986 2.5L 1997-99
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 TURBO 2000-05
- Porsche 996 GT3 MKI 1999-02
Water Temperature Sensor
OE Match replacement water temperature sensor for Porsche
Boxster 986 and Porsche 996 models.
Fits:
- Porsche Boxster 986 2.5L 1997-99
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 TURBO 2000-05
- Porsche 996 GT3 MKI 1999-02
Diagram Ref No 29
This essential engine management component monitors coolant temperature and sends information to the engine control unit (ECU), helping regulate fuel delivery, engine performance and cooling system operation.
Designed as an original-style replacement, it helps restore accurate temperature monitoring and reliable engine operation when the original sensor becomes faulty.
What Does the Water Temperature Sensor Do?
The sensor measures engine coolant temperature and sends an electrical signal to the ECU.
This information helps the engine management system adjust fuel mixture, cold-start operation and other temperature-dependent functions, ensuring efficient engine performance.
Why Does It Fail?
Over time, repeated heating and cooling cycles, moisture and electrical deterioration can affect sensor accuracy.
Common problems include:
- Internal sensor failure
- Corroded or damaged electrical connections
- Incorrect or fluctuating temperature readings
- Intermittent electrical signals
- Damage caused by coolant leaks or overheating
When Should It Be Replaced?
Replacement may be necessary if you experience:
- Incorrect or erratic engine temperature readings
- Difficult cold starting or poor warm-up performance
- Increased fuel consumption
- Engine management warning lights
- Cooling fan operation that appears abnormal
Before replacement, check the coolant level, electrical connector, wiring and relevant fault codes to confirm the cause.
Additional 996 variants may have different sensor arrangements. Confirm compatibility using the original part number or vehicle VIN before ordering.
Porsche Boxster 986 & 911 996 Coolant Temperature Sensors
The coolant temperature sensor plays an important role in the engine management system of water-cooled Porsche models, providing accurate temperature information for efficient engine operation.
A faulty sensor can cause incorrect temperature readings, poor cold starting, increased fuel consumption and engine management faults.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99660640501
The product you are viewing cross references to these numbers
- 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
- Porsche 970.1 Panamera S V8 4.8L 2009-13
- Porsche 970.1 Panamera 4S V8 4.8L 2009-13
- Porsche 970.1 Panamera GTS V8 4.8L 2011-13
- Porsche 970.1 Panamera Turbo V8 4.8L 2009-13
- Porsche 970.1 Panamera Turbo S V8 4.8L 2009-13
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD (420Hp) 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD (420Hp) 2014-16
- Porsche 970.2 Panamera GTS V8 4.8L 4WD (440Hp) 2014-16
- Porsche 970.2 Panamera Turbo V8 4.8L (520Hp) 2014-16
- Porsche 970.2 Panamera Turbo S V8 4.8L 2014-16
- Porsche 95B.1 Macan S Petrol 3.0L V6 (340Bhp) 2014-18
- Porsche 95B.1 Macan Turbo 3.6L V6 (400Bhp) 2014-18
The thermostat housing is located at the top of the engine above and behind the water pump.
Fits:
Porsche Cayenne S / GTS / Turbo 2011-18
Porsche 95B Macan S / Turbo 2014-18
Porsche 970 Panamera S / GTS / Turbo 2010-16
Previous numbers:
94810603400, 94810603401, 94810603402, 94810603403
Click 'Zoom in' for large parts diagram.
Diagram ref no 6
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810603404
The product you are viewing cross references to these numbers
- 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
- Porsche 970.1 Panamera S V8 4.8L 2009-13
- Porsche 970.1 Panamera 4S V8 4.8L 2009-13
- Porsche 970.1 Panamera GTS V8 4.8L 2011-13
- Porsche 970.1 Panamera Turbo V8 4.8L 2009-13
- Porsche 970.1 Panamera Turbo S V8 4.8L 2009-13
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD (420Hp) 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD (420Hp) 2014-16
- Porsche 970.2 Panamera GTS V8 4.8L 4WD (440Hp) 2014-16
- Porsche 970.2 Panamera Turbo V8 4.8L (520Hp) 2014-16
- Porsche 970.2 Panamera Turbo S V8 4.8L 2014-16
- Porsche 95B.1 Macan S Petrol 3.0L V6 (340Bhp) 2014-18
- Porsche 95B.1 Macan Turbo 3.6L V6 (400Bhp) 2014-18
Thermostat Insert with Aluminium Housing and O-Rings
Restore correct engine temperature control with this OE
Match Thermostat Insert. The thermostat regulates coolant flow between the engine and
radiator. It helps the engine reach operating temperature quickly when cold and
then maintains the correct temperature by controlling coolant circulation
through the radiator.
Fits:
- 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
- Porsche 970.1 Panamera S V8 4.8L 2009-13
- Porsche 970.1 Panamera 4S V8 4.8L 2009-13
- Porsche 970.1 Panamera GTS V8 4.8L 2011-13
- Porsche 970.1 Panamera Turbo V8 4.8L 2009-13
- Porsche 970.1 Panamera Turbo S V8 4.8L 2009-13
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD (420Hp) 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD (420Hp) 2014-16
- Porsche 970.2 Panamera GTS V8 4.8L 4WD (440Hp) 2014-16
- Porsche 970.2 Panamera Turbo V8 4.8L (520Hp) 2014-16
- Porsche 970.2 Panamera Turbo S V8 4.8L 2014-16
- Porsche 95B.1 Macan S Petrol 3.0L V6 (340Bhp) 2014-18
- Porsche 95B.1 Macan Turbo 3.6L V6 (400Bhp) 2014-18
Diagram ref no 6
What Does the Thermostat Insert Do?
When the engine is cold, the thermostat remains closed to restrict coolant flow through the radiator, helping the engine warm up efficiently.
As coolant temperature rises, the thermostat opens and allows coolant to circulate through the radiator where excess heat can be removed.
A correctly operating thermostat helps:
- Maintain the correct engine temperature
- Allow faster engine warm-up
- Regulate coolant flow through the radiator
- Prevent excessive engine temperatures
- Support efficient engine operation
- Maintain consistent cooling system performance
Why Do Thermostats Fail?
Thermostats operate through thousands of heating and cooling cycles and can gradually deteriorate with age.
Common causes include:
- Internal mechanical wear
- Thermostat valve sticking
- Weakening of the temperature-sensitive element
- Coolant contamination or deposits
- Corrosion within the cooling system
- Overheating General age-related deterioration
A thermostat can fail either open or closed. A thermostat stuck open can cause the engine to run too cool, while one stuck closed can restrict coolant circulation and cause overheating.
When Should the Thermostat Be Replaced?
Replacement should be considered if:
- The engine takes unusually long to warm up
- Engine temperature remains below normal
- Engine temperature becomes too high
- Temperature readings fluctuate unexpectedly
- Cabin heater performance is poor
- Diagnostic testing indicates incorrect coolant temperature
- The thermostat is sticking or no longer opening correctly
- Cooling system repairs make replacement advisable
Thermostat replacement is also commonly considered during major cooling system maintenance, particularly on higher-mileage vehicles.
Important Cooling System Checks
Overheating or incorrect engine temperature is not always caused by the thermostat.
The coolant level, water pump, radiator, cooling fans, hoses and cooling system should also be inspected when diagnosing temperature problems.
Any coolant leaks should be repaired and the cooling system correctly filled and bled after thermostat replacement.
Porsche Cayenne, Macan & Panamera Thermostats
The thermostat is a key component of the Porsche engine cooling system, controlling coolant circulation according to engine temperature.
As Cayenne, Macan and Panamera models age, thermostats can become slow to operate or stick partially open or closed. Typical symptoms include slow engine warm-up, low operating temperature, fluctuating temperature readings or overheating.
When diagnosing Porsche cooling system problems, the thermostat should be checked alongside the water pump, radiator, coolant level and other cooling system components.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810603404
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne 3.6L 2007-10
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
- 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
- Porsche 970.1 Panamera V6 3.6L 2WD 2009-13
- Porsche 970.1 Panamera 4 V6 3.6L 4WD 2009-13
- Porsche 970.1 Panamera S V8 4.8L 2009-13
- Porsche 970.1 Panamera 4S V8 4.8L 2009-13
- Porsche 970.1 Panamera GTS V8 4.8L 2011-13
- Porsche 970.1 Panamera Turbo V8 4.8L 2009-13
- Porsche 970.1 Panamera Turbo S V8 4.8L 2009-13
- Porsche 970.2 Panamera V6 3.6L 2WD (310Hp) 2014-16
- Porsche 970.2 Panamera 4 V6 3.6L 4WD (310Hp) 2014-16
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD (420Hp) 2014-16
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD Executive 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD (420Hp) 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD Executive 2014-16
- Porsche 970.2 Panamera GTS V8 4.8L 4WD (440Hp) 2014-16
- Porsche 970.2 Panamera Turbo V8 4.8L (520Hp) 2014-16
- Porsche 970.2 Panamera Turbo V8 Executive 2014-16
- Porsche 970.2 Panamera Turbo S V8 4.8L 2014-16
- Porsche 95B.1 Macan S Petrol 3.0L V6 (340Bhp) 2014-18
- Porsche 95B.1 Macan GTS Petrol 3.0L V6 (360Bhp) 2014-18
- Porsche 95B.1 Macan Turbo 3.6L V6 (400Bhp) 2014-18
Fits:
Porsche 957 Cayenne 4.8L S / GTS / Turbo 2008-10
Porsche 958 Cayenne 3.6L 2015-18
Porsche 958 Cayenne 4.8L S / GTS / Turbo 2011-18
Porsche 95B Macan 3.0L S / 3.6L Turbo 2014-18
Porsche 970 Panamera 3.6L 2011-16
Porsche 970 Panamera 4.8L S / GTS / Turbo 2011-16
Click 'Zoom in' for large parts diagram.
Diagram Ref No 8 or 9
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810670700
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne 3.6L 2007-10
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
- 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
- Porsche 970.1 Panamera V6 3.6L 2WD 2009-13
- Porsche 970.1 Panamera 4 V6 3.6L 4WD 2009-13
- Porsche 970.1 Panamera S V8 4.8L 2009-13
- Porsche 970.1 Panamera 4S V8 4.8L 2009-13
- Porsche 970.1 Panamera GTS V8 4.8L 2011-13
- Porsche 970.1 Panamera Turbo V8 4.8L 2009-13
- Porsche 970.1 Panamera Turbo S V8 4.8L 2009-13
- Porsche 970.2 Panamera V6 3.6L 2WD (310Hp) 2014-16
- Porsche 970.2 Panamera 4 V6 3.6L 4WD (310Hp) 2014-16
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD (420Hp) 2014-16
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD Executive 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD (420Hp) 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD Executive 2014-16
- Porsche 970.2 Panamera GTS V8 4.8L 4WD (440Hp) 2014-16
- Porsche 970.2 Panamera Turbo V8 4.8L (520Hp) 2014-16
- Porsche 970.2 Panamera Turbo V8 Executive 2014-16
- Porsche 970.2 Panamera Turbo S V8 4.8L 2014-16
- Porsche 95B.1 Macan S Petrol 3.0L V6 (340Bhp) 2014-18
- Porsche 95B.1 Macan GTS Petrol 3.0L V6 (360Bhp) 2014-18
- Porsche 95B.1 Macan Turbo 3.6L V6 (400Bhp) 2014-18
Fits:
Porsche 957 Cayenne 4.8L S / GTS / Turbo 2008-10
Porsche 958 Cayenne 3.6L 2015-18
Porsche 958 Cayenne 4.8L S / GTS / Turbo 2011-18
Porsche 95B Macan 3.0L S / 3.6L Turbo 2014-18
Porsche 970 Panamera 3.6L 2011-16
Porsche 970 Panamera 4.8L S / GTS / Turbo 2011-16
Click 'Zoom in' for large parts diagram.
Diagram Ref No 8 or 9
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810670700
The product you are viewing cross references to these numbers