How To Replace Thermostat In Car

Replacing the thermostat in your car is an important part of maintaining your vehicle’s engine. A faulty thermostat can cause your engine to overheat or not warm up enough, leading to poor performance and potential damage. In this article, we will guide you through the steps of how to replace thermostat in car.

Step 1: Gather Your Tools

Before you begin, you will need to gather the necessary tools for replacing your car’s thermostat. These tools include:

  • Socket Set
  • New Thermostat
  • Gasket Sealant
  • Drain Pan
  • New Coolant

Step 2: Drain the Coolant

The first step in replacing your car’s thermostat is to drain the coolant from the engine. Locate the radiator drain plug and place a drain pan underneath to catch the coolant. Once the coolant has been drained, dispose of it properly.

Step 3: Remove the Thermostat Housing

Next, locate the thermostat housing on your engine. It is usually located on the top or side of the engine and can be identified by a hose leading to it. Use your socket set to remove the bolts that hold the thermostat housing in place.

Step 4: Remove the Old Thermostat

Once you have removed the thermostat housing, you will see the old thermostat in place. Gently remove the old thermostat and clean the housing surface with a rag. Be sure to remove any old gasket material as well.

Step 5: Install the New Thermostat

Install the new thermostat into the housing, making sure it is positioned correctly. Apply a small amount of gasket sealant to the housing surface and place the gasket onto the sealant. Then, install the thermostat housing and tighten the bolts securely.

Step 6: Refill the Coolant

Refill the engine with new coolant, making sure to follow the manufacturer’s specifications for the correct type and amount of coolant. Start the engine and let it run for a few minutes to circulate the coolant. Check the coolant level and add more as needed.


Q: Can I replace my car’s thermostat myself?

A: Yes, replacing your car’s thermostat is a relatively simple task that can be done by any DIY mechanic.

Q: How do I know if my car’s thermostat needs to be replaced?

A: If your engine is overheating or not warming up enough, it could be a sign that your thermostat is faulty and needs to be replaced.

Q: Can I drive my car with a faulty thermostat?

A: It is not recommended to drive your car with a faulty thermostat as it can cause damage to your engine and lead to more costly repairs.

Q: How often should I replace my car’s thermostat?

A: It is recommended to replace your car’s thermostat every 50,000 to 100,000 miles or as specified by your vehicle’s manufacturer.


Replacing the thermostat in your car is a simple task that can improve your engine’s performance and prevent potential damage. By following these steps and using the correct tools and materials, you can replace your car’s thermostat yourself and save money on costly repairs.