How to Change the Thermostat on a Subaru WRX

Changing the thermostat on your Subaru WRX is an essential part of maintaining the engine’s optimal performance. The thermostat is responsible for regulating the engine’s temperature, ensuring that it runs at a consistent and efficient level. Over time, the thermostat can become worn or damaged, leading to engine problems and reduced performance. In this guide, we will show you how to change the thermostat on your Subaru WRX, step-by-step.

Key takeaways

  • The thermostat regulates the engine’s temperature, ensuring optimal performance.
  • Changing the thermostat is essential for maintaining the engine’s health and efficiency.
  • The process involves draining and refilling the coolant system and removing and replacing the thermostat.

Tools and materials you will need

  • Pliers
  • Screwdriver
  • Socket wrench
  • Drain pan
  • Replacement thermostat
  • Replacement gasket
  • Coolant

Step-by-step guide to changing the thermostat on a Subaru WRX

Step 1: Drain the coolant

Before you start, make sure the engine is cool. Locate the drain bolt on the bottom of the radiator and place a drain pan underneath it. Open the bolt and let the coolant drain until it stops.

Step 2: Remove the old thermostat

Locate the thermostat housing, which is usually located on the engine block, near the top of the engine. Use pliers to remove the hose clamp from the housing and remove the hose. Use a screwdriver or socket wrench to remove the bolts or nuts holding the thermostat housing in place. Carefully remove the housing, being mindful not to damage any gaskets or seals. Remove the old thermostat and gasket.

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Step 3: Install the new thermostat

Install the new thermostat using the replacement gasket. Make sure the thermostat is installed in the correct orientation, with the spring-side facing into the engine block. Replace the thermostat housing and tighten the bolts or nuts to the manufacturer’s specifications.

Step 4: Refill the coolant

Refill the coolant system with the proper coolant, following the manufacturer’s recommendations. Start the engine and let it run for a few minutes, checking for leaks and ensuring the temperature gauge is reading in the normal range. Let the engine cool down and recheck the coolant level, adding more as needed.

Step 5: Test drive

Take your Subaru WRX for a test drive, monitoring the temperature gauge and checking for any signs of overheating or leaks. If everything checks out, you’re done!

Congratulations, you have successfully changed the thermostat on your Subaru WRX, ensuring optimal engine performance and efficiency.

Frequently asked questions

How do I know if my thermostat needs to be replaced?

There are several signs that your thermostat may need to be replaced, including:

  • The engine temperature gauge is reading higher or lower than normal.
  • The heater is not working or is blowing cold air.
  • The engine is overheating or running rough.
  • The coolant level is low or there are signs of coolant leaks.

Can I change the thermostat myself?

Yes, changing the thermostat on a Subaru WRX is a relatively simple task that can be done at home. However, if you are not comfortable working on your car or have limited experience with car maintenance, it may be best to have a professional mechanic perform the task.

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How often should I change my thermostat?

The lifespan of a thermostat can vary depending on driving conditions and maintenance practices. It is recommended to have the thermostat inspected and tested at every routine maintenance interval and replaced if necessary. As a general rule, it is recommended to replace the thermostat every 50,000 to 100,000 miles.

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Peter Banks

With years of experience as a professional mechanic and Subaru specialist, Peter is one of the most respected members of our team. He's written several articles on Subaru maintenance and repair, and his advice and tips are always practical and helpful. When he's not working on cars, he enjoys cooking and trying out new recipes.

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