Water Pump and Ancillary Hoses

Engine Coolant Thermostat Kit
This Engine Coolant Thermostat Kit is a complete cooling system service set designed to replace the thermostat and all related components on the Porsche Cayenne 958 3.6L petrol engine (model years 2011 to 2018). It includes OE Match thermostat components, genuine Porsche hardware, seals, gaskets, and sensor - everything required for a professional-grade repair.

Fits:
Porsche 958 Cayenne 3.6L 2011 - 2018

Diagram ref no 8 - 21

This comprehensive kit is engineered to provide a full replacement of the thermostat assembly and associated cooling parts that regulate engine temperature. It includes an OE Match thermostat and thermostat cover, genuine Porsche mounting bolts and seals, an OE Match coolant temperature sensor, adapter and multiple O-rings and gaskets - giving you a complete solution instead of piecemeal parts.

  This kit fits directly in place of the stock thermostat assembly and related parts; no modifications are necessary.  

The thermostat system controls the flow of coolant from the engine to the radiator based on temperature. When the engine is cold, the thermostat remains closed to allow the engine to warm up quickly. As temperature rises, it opens to let coolant pass to the radiator for heat dissipation. This kit ensures consistent and reliable thermo-management, helping your Cayenne reach and maintain optimal operating temperature for performance and emissions control.

Function
A properly functioning thermostat promotes engine efficiency by:
• Enabling rapid warm-up after start
• Preventing overheating during high-load operation
•  Supporting optimal combustion and emissions performance
•  Reducing thermal stress on engine components

The included sensor provides accurate temperature feedback to the vehicle’s ECU, optimizing cooling fan and fuel delivery responses. Genuine seals and O-rings prevent leaks and ensure long-term system integrity.

The thermostat and its associated hardware play a crucial role in relaying correct engine temperature management. A failing thermostat can cause: 
•  Engine to run too cold, hurting fuel economy and emissions
•  Engine to overheat, risking head gasket damage or warped components
•  Erratic temperature gauge behaviour
•  Incorrect fuelling and ignition timing due to poor temp sensor readings

Replacing worn or faulty thermostat components with quality OE Match parts restores reliable engine cooling, protects against overheating, and preserves performance and longevity.

Replace the thermostat kit if you notice:
•  Engine overheating
•  Inconsistent temperature gauge readings
•  Heater core not producing heat
•  Coolant leaks around thermostat housing
•  Failed temperature sensor codes
•  During major cooling system service

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

THERMOSTATKIT.958.36

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