Calorstat TH1400.83J - Engine Coolant Thermostat

Product Overview

The Calorstat TH1400.83J is a precision engine coolant thermostat designed for Porsche 924 models from 1977 to 1982. This single-unit replacement maintains optimal engine operating temperature by regulating coolant flow through the engine and radiator. Calorstat thermostats are engineered to factory specifications and deliver reliable thermal management for consistent performance and longevity.

This thermostat is sold individually. Verify your vehicle's thermostat housing type before ordering to ensure proper fitment.

Symptoms of a Failing Thermostat

• Engine running too hot or coolant temperature gauge reading high
• Engine running too cold, slow to reach operating temperature, or poor fuel economy
• Coolant leaking from the thermostat housing or around the gasket
• Overheating on the highway or during sustained driving
• Erratic temperature gauge behavior or fluctuating readings

Cross Reference Numbers

This Calorstat TH1400.83J is equivalent to or replaces the following part numbers: 059121113B, TH140083J.

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.

• Porsche 924 2.0 L4 Gas (Base): 1977–1982
• Porsche 924 Turbo 2.0 L4 Gas: 1979–1982

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

Often Replaced Together

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

• Engine coolant (flush and refill with manufacturer-specified type)
• Thermostat housing gasket
• Radiator hoses (upper and lower)
• Water pump (if high mileage)

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Frequently Asked Questions

How do I know if my Porsche 924 thermostat is failing?

Common signs include the engine running significantly hotter or colder than normal, a temperature gauge that fluctuates unexpectedly, or coolant leaking around the thermostat housing. If your 924 takes a long time to warm up in cold weather or overheats during highway driving, the thermostat may be stuck open or closed. A visual inspection for coolant seepage around the housing gasket is also a good indicator.

What is the purpose of a thermostat in my engine?

The thermostat acts as a valve that opens and closes to regulate coolant flow between the engine and radiator. When the engine is cold, the thermostat stays closed to allow the engine to warm up quickly. Once it reaches operating temperature, the thermostat opens to allow coolant to circulate through the radiator for cooling. A properly functioning thermostat keeps your engine in the ideal temperature range for efficiency and longevity.

Do I need any special tools to replace the thermostat on my 924?

Basic hand tools such as a socket set, wrenches, and screwdrivers are typically required. You will also need a drain pan for coolant, a thermostat gasket scraper, and a new gasket for the housing. Consult your service manual for the specific fastener sizes and torque specifications. Allow the engine to cool completely before beginning work to avoid coolant scalding.

Should I replace the thermostat housing gasket at the same time?

Yes, it is strongly recommended to replace the gasket whenever you remove the thermostat. The gasket is inexpensive and easy to replace while the housing is already off, and a fresh seal prevents future coolant leaks. Reusing an old gasket increases the risk of seepage and potential overheating issues.

What coolant type should I use after replacing the thermostat?

Always use the coolant type specified in your Porsche 924 owner's manual or service documentation. Using the wrong coolant can cause compatibility issues and reduce cooling efficiency. Flush the cooling system thoroughly before refilling with fresh coolant to remove any debris or old fluid residue.

How long does a thermostat typically last on a Porsche 924?

A quality thermostat can last 80,000 to 100,000 miles or more under normal operating conditions. However, age, coolant quality, and driving habits all affect longevity. If your 924 is showing temperature control symptoms and has high mileage, thermostat replacement is a practical preventive maintenance step to avoid overheating damage.

Order Calorstat TH1400.83J 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 Porsche 924.

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.