How to Replace a Thermostat

Below guide will teach you How to Replace a Thermostat . Please follow the instructions carefully.

Things You’ll Need:

  • Screwdriver
  • Cooling System Pressure Tester
  • Socket and Ratchet Set
  • Needle Nose Pliers
  • 3/8 in. Drive Ratchet
  • Thermostat Gasket
  • Thermostat

Estimated Costs:

  • DIY Costs: Est. $39.25 parts only
  • Shop Costs: Est. $149.08 parts and labor


  • Park the vehicle on a level surface and allow the engine to cool down.
  • Prop the engine hood up and look for the radiator.
  • Take the radiator cap off and perform pressure test to verify any leaks.
  • Unfasten the radiator drain plug or disconnect lower radiator hose to allow coolant to drain out. Fasten the drain plug when the coolant level drops below the thermostat.
  • Discard the upper radiator hose as well.
  • Unfasten the bolts holding the thermostat housing in place and take the thermostat housing out.
  • Next, take the thermostat out of the thermostat housing.
  • Wipe off the mounting surface properly so the remaining of the gasket is removed. Position new gasket and reassemble the new thermostat.
  • Fix the thermostat housing in place and secure it with the mounting bolts.
  • Reattach the upper radiator hose.
  • Add coolant to the radiator reservoir and make sure the coolant level reaches to the MAX mark.
  • Switch the engine on and let it idle for few minutes. Turn off the engine and check the coolant level again. Add if required.
  • Recap the radiator. Turn the engine on again and check the temperature gauge.

Further Reading

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