How to Change the Thermostat in a Jeep Grand Cherokee


Available for more than 30 years, the Grand Cherokee is a popular model offered by Jeep. Whatever engine type or year you might have, changing the thermostat in a Grand Cherokee remains the same. If you have overheating issues with your Jeep, here's how to change the thermostat.

Things You'll Need

  • Container
  • Clamp tool or vise-grip pliers
  • Thermostat and gasket
  • 10mm socket or wrench
  • Razor blade
  • Flathead screwdriver (if necessary)
  • Open draincock on the radiator to drain the coolant from your Jeep Grand Cherokee. This draincock is located on the lower right side facing the rear of your Cherokee. Use a sealable container and reuse the coolant if it is relatively new and clean.

  • Follow the upper radiator hose to the point where it meets the thermostat housing. The thermosat is located inside the housing. Use a clamp tool or vise-grip pliers to loosen the clamp holding the hose to the housing. Work the end of the radiator hose free of the thermostat housing.

  • Remove two bolts holding on the thermostat housing cover. Pull off the cover. Take note of the position of the old thermostat. Remove and install the new thermostat in exactly the same position.

  • Scrape off residue of the old thermostat gasket from the inside of the thermostat housing cover using a razor blade. Avoid getting any debris inside the thermostat housing.

  • Install the new gasket. Reattach the thermostat housing cover and radiator hose. Start your Jeep Cherokee and run the heater on high. Allow the engine to warm up. Check for leaks.

Tips & Warnings

  • In some models of the Jeep Grand Cherokee, the lower belt may be in the way to access the lower bolt of the thermostat housing if the entire housing needs to be removed. You will need to remove the lower belt in this case.
  • Use a flathead screwdriver to work the end of the radiator hose free from the thermostat housing, if necessary.
  • Do not drain the coolant from your Grand Cherokee if the engine is hot. Allow the engine to cool before draining coolant.

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