Calorstat TE7368.107J - Engine Coolant Thermostat

Product Overview

The Calorstat TE7368.107J is a precision engine coolant thermostat engineered for high-performance Audi and Porsche models equipped with 4.0-liter twin-turbocharged V8 engines. This thermostat maintains optimal coolant flow and engine temperature regulation across the D5 A8 and S8 sedans, C8 RS6 Avant and RS7 Sportback wagons, and D5-platform variants, as well as the 970 and 971 Panamera sedan and Sport Turismo models and the 9YA Cayenne SUV lineup. Proper thermostat function is critical for engine longevity, fuel efficiency, and emissions control, especially in turbocharged applications where thermal management directly impacts performance and reliability.

Symptoms of a Failing Engine Coolant Thermostat

• Engine running hotter than normal; temperature gauge reading in the upper range or overheating warnings on the instrument cluster.
• Engine running too cold; slow warm-up or the heater taking longer than usual to produce hot air.
• Coolant leaks around the thermostat housing or visible seepage at the thermostat gasket.
• Rough idle or hesitation during acceleration, caused by the engine computer compensating for incorrect coolant temperature.
• Check Engine Light or fault codes related to coolant temperature sensor readings (P0128, P0125, or similar).
• Unusual coolant smell or steam from the engine bay, indicating overheating or internal leakage.

Cross Reference Numbers

This Calorstat TE7368.107J is equivalent to or replaces the following part numbers: PAB121115F, 0P2121115E, TE7368107J.

Vehicle Compatibility

This part fits the popular models below. For Fitment Confidence, please use the vehicle selector tool above to verify exact compatibility for your vehicle.

• Audi A8 4.0 V8 MHEV (D5): 2019–2021
• Audi S8 4.0 V8 MHEV (D5): 2020–2024
• Audi RS6 Avant 4.0 V8 MHEV (C8): 2021–2024
• Audi RS7 Sportback 4.0 V8 MHEV (C8): 2021–2024
• Audi SQ7 4.0 V8 MHEV (4M): 2020–2024
• Audi SQ8 4.0 V8 MHEV (4M): 2020–2024
• Porsche Panamera Turbo 4.0 V8 (970, 971): 2017–2023
• Porsche Panamera Turbo S E-Hybrid 4.0 V8 PHEV (970, 971): 2018–2023
• Porsche Panamera GTS 4.0 V8 (971): 2019–2023
• Porsche Panamera GTS Sport Turismo 4.0 V8 (971): 2019–2023
• Porsche Cayenne Turbo 4.0 V8 (9YA): 2019–2023
• Porsche Cayenne Turbo Coupe 4.0 V8 (9YA): 2020–2023
• Porsche Cayenne Turbo S E-Hybrid 4.0 V8 PHEV (9YA): 2020–2023
• Porsche Cayenne GTS 4.0 V8 (9YA): 2021–2023
• Porsche Cayenne GTS Coupe 4.0 V8 (9YA): 2021–2023
• Porsche Cayenne Turbo GT Coupe 4.0 V8 (9YA): 2022–2023

This may also fit other applications. Please use the vehicle selector tool to verify fitment.

Often Replaced Together

For a complete cooling system refresh, many owners replace the following at the same time:

• Engine coolant (OEM specification for your model year and engine type).
• Coolant hoses and clamps, especially if they show signs of age or deterioration.
• Coolant expansion tank cap and seal.
• Water pump, if mileage is high or the pump shows signs of wear.

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Frequently Asked Questions

How do I know if my Audi A8 or Porsche Panamera needs a new thermostat?

Common signs include the engine running consistently hot or cold, slow warm-up times, or coolant leaks around the thermostat housing. If your temperature gauge reads abnormally or you see coolant-related fault codes on the dashboard, the thermostat is a prime suspect. A professional diagnostic scan can confirm whether the thermostat or the coolant temperature sensor is the issue.

What is the difference between a stuck-open and stuck-closed thermostat?

A stuck-open thermostat allows coolant to flow continuously, causing the engine to run too cold and taking longer to warm up. A stuck-closed thermostat restricts coolant flow, causing overheating and potential engine damage. Both conditions degrade fuel efficiency and can trigger fault codes. The Calorstat TE7368.107J is a new component that eliminates both failure modes.

Do I need to replace the coolant when I replace the thermostat?

It is strongly recommended to replace the engine coolant at the same time. Old coolant loses its corrosion inhibitors and heat transfer properties over time. Draining and refilling with fresh OEM-specification coolant ensures optimal cooling system performance and extends the life of the new thermostat and other cooling components.

Is the Calorstat TE7368.107J compatible with both gasoline and PHEV models?

Yes. This thermostat is designed to fit Porsche Panamera and Cayenne models with 4.0-liter twin-turbocharged V8 engines, whether they are pure gasoline or PHEV (plug-in hybrid) variants. The cooling system design is the same across both powertrains. Always verify fitment using the vehicle selector tool for your specific year and trim.

What tools and skills are required to replace this thermostat?

Thermostat replacement typically requires basic hand tools, a socket set, a drain pan for coolant, and a torque wrench. The job involves draining some coolant, removing the thermostat housing bolts, and installing the new unit with a fresh gasket. Consult your factory service manual for exact procedures, torque specifications, and any model-specific steps. If you are uncomfortable working with the cooling system, a professional technician is recommended.

How long does a thermostat typically last on a high-performance Audi or Porsche?

Engine thermostats typically last 80,000 to 100,000 miles under normal conditions, though turbocharged engines like those in the Audi S8, RS6, RS7, and Porsche Panamera and Cayenne may experience accelerated wear due to higher heat loads. Preventive replacement during a major service or at the first sign of temperature regulation problems is wise to avoid costly overheating damage.

Order Calorstat TE7368.107J today. In-stock orders ship same or next business day from our U.S. warehouse, and our fitment team is one call away if you need help confirming the right part for your Audi or Porsche.

Note: All information on this page and in the FAQ is for general reference only. Verify fitment and consult a professional as needed. eEuroparts.com is not responsible for incorrect part selection or installation.