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Porsche > 992 (911) MK1 2019-2024 > 992.1 Carrera 2S / GTS 3.0L 2019-24 > Engine Cooling > Thermostat / Temperature Sensor >

Seal ring thermostat housing. Porsche 958 Cayenne 3.6ltr  ❭  WHT000863

Seal ring thermostat housing. Porsche 958 Cayenne 3.6ltr - WHT000863
2
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WHT000863
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Thermostat Housing Seal Ring for Porsche 958 Cayenne 3.6L – Essential Cooling System Sealing Component

This thermostat housing seal ring is designed specifically for the Porsche 958 Cayenne 3.6-litre engine, providing a critical seal between the thermostat and its housing. Its role is to maintain system pressure and prevent coolant leaks, ensuring the engine operates within its correct temperature range under all driving conditions.

Fits:

  • Porsche 958 Cayenne V6 3.6L Petrol 300Hp 2010-17

Diagram ref no 11

Even though it is a small component, the thermostat housing seal ring plays a major role in cooling system reliability. Over time, heat cycling, coolant exposure and age can cause the seal to harden, flatten or crack—leading to coolant leaks, pressure loss and potential overheating. Replacing the seal during thermostat service or cooling system repairs is essential preventative maintenance.

What the Thermostat Housing Seal Ring Does

This sealing ring:

  • Creates a watertight seal between the thermostat and housing
  • Maintains correct cooling system pressure
  • Prevents coolant leaks during engine operation
  • Supports accurate thermostat function
  • Ensures stable engine temperature regulation

A properly sealing thermostat housing is vital for efficient cooling performance.

Why Thermostat Housing Seal Rings Fail

Common causes of failure include:

  • Heat cycling, causing the seal to harden or lose elasticity
  • Coolant chemical exposure, degrading the sealing material
  • Compression set, where the seal flattens over time
  • Improper installation, leading to pinching or distortion
  • Age-related material fatigue, especially on higher-mileage vehicles

Symptoms often include coolant residue around the housing, low coolant warnings or unexplained coolant loss.

Why the Seal Ring Should Be Replaced

Replacing the thermostat housing seal ring provides:

  • Restored leak-free cooling system operation
  • Correct pressure retention for efficient coolant flow
  • Prevention of overheating and engine stress
  • Reliable sealing after thermostat replacement
  • Low-cost protection against expensive cooling repairs

It is strongly recommended to replace the seal ring whenever the thermostat is removed or serviced.



Related reference numbers
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WHT000863
WHT000863

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Fits:

  • Porsche Boxster 981 2.7L 2012-16
  • Porsche Boxster 981 S / GTS 3.4L 2012-16
  • Porsche Boxster 718 2.0L Manual (300 Bhp)
  • Porsche Boxster 718 2.0L PDK (300 Bhp)
  • Porsche Boxster S 718 2.5L Manual (350 Bhp)
  • Porsche Boxster S 718 2.5L PDK (350 Bhp)
  • Porsche Boxster T 718 2.0L Manual (300 Bhp)
  • Porsche Boxster T 718 2.0L PDK (300 Bhp)
  • Porsche Boxster GTS 718 2.5L Manual (365 Bhp)
  • Porsche Boxster GTS 718 2.5L PDK (365 Bhp)
  • Porsche Boxster GTS 718 4.0L Manual (400 Bhp)
  • Porsche Boxster GTS 718 4.0L PDK (400 Bhp)
  • Porsche Boxster Spyder 718 4.0L (420 Bhp)
  • Porsche Boxster 25 Years 718 4.0L Manual (400 Bhp)
  • Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp)
  • Porsche 991.1 Carrera C2 3.4L (350Bhp) 2012-16
  • Porsche 991.1 Carrera C2S 3.8L (400Bhp) 2012-16
  • Porsche 991.1 Carrera C4 3.4L (350Bhp) 2012-16
  • Porsche 991.1 Carrera C4S 3.8L (400Bhp) 2012-16
  • Porsche 991.1 Turbo 3.8L (520bhp) 2014-16
  • Porsche 991.1 Turbo S 3.8L (560Bhp) 2014-16
  • Porsche 991.2 Carrera 2 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Carrera 2S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Carrera 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Carrera 4S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 2 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 2S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 4S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Targa 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Targa 4S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
  • Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
  • Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
  • Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
  • Porsche 992.1 Carrera 2 3.0L 2019-24
  • Porsche 992.1 Carrera 4 3.0L 2019-24
  • Porsche 992.1 Carrera 2 Cabriolet 3.0L 2019-24
  • Porsche 992.1 Carrera 4 Cabriolet 3.0L 2019-24
  • Porsche 992.1 Carrera 2S / GTS 3.0L 2019-24
  • Porsche 992.1 Carrera 4S / GTS 3.0L 2019-24
  • Porsche 992.1 Carrera 2S / GTS Cabriolet 3.0L 2019-24
  • Porsche 992.1 Carrera 4S / GTS Cabriolet 3.0L 2019-24
  • Porsche 992.1 Targa 4 3.0L 2020-24
  • Porsche 992.1 Targa 4S / GTS 3.0L 2020-24
  • Porsche 992.1 Turbo 3.8L 2020-24
  • Porsche 992.1 Turbo S 3.8L 2020-24
  • Porsche 992.1 Turbo Cabriolet 3.8L 2020-24
  • Porsche 992.1 Turbo S Cabriolet 3.8L 2020-24
  • Porsche 992.2 Carrera 2 3.0L 2024>>
  • Porsche 992.2 Carrera 2 3.0L Cabriolet 2024>>         
  • Porsche Cayman 2.7L 981 2013-16
  • Porsche Cayman S / GTS 3.4L 981 2013-16
  • Porsche Cayman GT4 3.8L 2015-16
  • Porsche Cayman 718 2.0L Manual (300Bhp)
  • Porsche Cayman 718 2.0L PDK (300Bhp)
  • Porsche Cayman S 718 2.5L Manual (350Bhp)
  • Porsche Cayman S 718 2.5L PDK (350Bhp)
  • Porsche Cayman T 718 2.0L Manual (300Bhp)
  • Porsche Cayman T 718 2.0L PDK (300 Bhp)
  • Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
  • Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
  • Porsche Cayman GTS 718 4.0L Manual (400 Bhp)
  • Porsche Cayman GTS 718 4.0L PDK (400 Bhp)
  • Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L

Old Porsche part numbers:
- 9A110622602
- 9A110622603

Diagram ref no 20

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Fits:
  • Porsche Boxster 981
  • Porsche Boxster 718
  • Porsche 991.1
  • Porsche 991.
  • Porsche 992.1
  • Porsche 992.2 Carrera
  • Porsche Cayman 981
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  • Porsche 9YA Cayenne
  • Porsche 971.1 Panamera
  • Porsche 971.2 Panamera
  • Porsche 976 Panamera
  • Porsche 95B.2 Macan        

Diagram ref no 5

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

0PB121688
9A712168800
927.770
0PB121688
9A110655900

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Water pump thermostat. Porsche 981/982 Boxster / 981C/982C Cayman / 991 / 992 - 40400009, 9A110622603, 9A110622602, 9A712111000, 0PB121110A
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The engine coolant thermostat is a small but essential component that regulates coolant flow through your engine. When the engine is cold, the thermostat remains closed to restrict coolant circulation, allowing the engine to reach its optimal operating temperature more quickly. Once the desired temperature is achieved, it opens to maintain consistent cooling and prevent overheating.   Products ref no. 9A712111000 which supersedes from old part numbers 9A110622602 & 9A110622603

Installation Tip: Always position the thermostat’s jiggle pin (bleed valve) at the 12 o’clock position when possible, to ensure proper air bleeding.

Thermostat Temperature Ratings

Many vehicles offer thermostats with different temperature ratings. These ratings indicate the temperature at which the thermostat begins to open.

In colder climates, a higher temperature thermostat helps the engine maintain warmth. In hot desert climates, a lower temperature thermostat may be preferred to enhance cooling efficiency.       

Fits:

  • Porsche Boxster 981 2.7L 2012-16
  • Porsche Boxster 981 S / GTS 3.4L 2012-16
  • Porsche Boxster 718 2.0L Manual (300 Bhp)
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  • Porsche Boxster GTS 718 2.5L Manual (365 Bhp)
  • Porsche Boxster GTS 718 2.5L PDK (365 Bhp)
  • Porsche Boxster GTS 718 4.0L Manual (400 Bhp)
  • Porsche Boxster GTS 718 4.0L PDK (400 Bhp)
  • Porsche Boxster Spyder 718 4.0L (420 Bhp)
  • Porsche Boxster 25 Years 718 4.0L Manual (400 Bhp)
  • Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp)
  • Porsche 991.1 Carrera C2 3.4L (350Bhp) 2012-16
  • Porsche 991.1 Carrera C2S 3.8L (400Bhp) 2012-16
  • Porsche 991.1 Carrera C4 3.4L (350Bhp) 2012-16
  • Porsche 991.1 Carrera C4S 3.8L (400Bhp) 2012-16
  • Porsche 991.1 Turbo 3.8L (520bhp) 2014-16
  • Porsche 991.1 Turbo S 3.8L (560Bhp) 2014-16
  • Porsche 991.2 Carrera 2 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Carrera 2S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Carrera 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Carrera 4S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 2 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 2S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 4S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Targa 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Targa 4S 3.0L (420 Bhp) 2016-19
  • Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
  • Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
  • Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
  • Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
  • Porsche 992.1 Carrera 2 3.0L 2019-24
  • Porsche 992.1 Carrera 4 3.0L 2019-24
  • Porsche 992.1 Carrera 2 Cabriolet 3.0L 2019-24
  • Porsche 992.1 Carrera 4 Cabriolet 3.0L 2019-24
  • Porsche 992.1 Carrera 2S / GTS 3.0L 2019-24
  • Porsche 992.1 Carrera 4S / GTS 3.0L 2019-24
  • Porsche 992.1 Carrera 2S / GTS Cabriolet 3.0L 2019-24
  • Porsche 992.1 Carrera 4S / GTS Cabriolet 3.0L 2019-24
  • Porsche 992.1 Targa 4 3.0L 2020-24
  • Porsche 992.1 Targa 4S / GTS 3.0L 2020-24
  • Porsche 992.1 Turbo 3.8L 2020-24
  • Porsche 992.1 Turbo S 3.8L 2020-24
  • Porsche 992.1 Turbo Cabriolet 3.8L 2020-24
  • Porsche 992.1 Turbo S Cabriolet 3.8L 2020-24
  • Porsche 992.2 Carrera 2 3.0L 2024>>
  • Porsche 992.2 Carrera 2 3.0L Cabriolet 2024>>         
  • Porsche Cayman 2.7L 981 2013-16
  • Porsche Cayman S / GTS 3.4L 981 2013-16
  • Porsche Cayman GT4 3.8L 2015-16
  • Porsche Cayman 718 2.0L Manual (300Bhp)
  • Porsche Cayman 718 2.0L PDK (300Bhp)
  • Porsche Cayman S 718 2.5L Manual (350Bhp)
  • Porsche Cayman S 718 2.5L PDK (350Bhp)
  • Porsche Cayman T 718 2.0L Manual (300Bhp)
  • Porsche Cayman T 718 2.0L PDK (300 Bhp)
  • Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
  • Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
  • Porsche Cayman GTS 718 4.0L Manual (400 Bhp)
  • Porsche Cayman GTS 718 4.0L PDK (400 Bhp)
  • Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L
Diagram ref no 20

Common Thermostat Failures

Thermostat Stuck Open (Most Common) The thermostat fails to close, causing continuous coolant flow even when the engine is cold. This prevents the engine from reaching normal operating temperature, often leading to poor fuel economy, rich air-fuel mixtures, and potential catalytic converter damage. Thermostat Stuck Closed The thermostat fails to open, restricting coolant flow through the engine. This results in overheating and may cause severe or even catastrophic engine damage.

Signs of a Failing Engine Coolant Thermostat

Engine overheating Engine not reaching optimal operating temperature Radiator fan not engaging properly       



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

0PB121110A
40400009
9A110622603
9A110622602
9A712111000
0PB121110A

The product you are viewing cross references to these numbers