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The Importance of Refilling & Bleeding the Cooling System After Replacing a Thermostat

Cooling System

Performing work on the cooling system can be laborious; however, auto technicians must ensure the entire repair or replacement is completed fully. After replacing a thermostat, the technician should ensure all air pockets are removed from the cooling system. Otherwise, the vehicle will be more likely to overheat.

With the new thermostat installed, refill the cooling system with the correct blend of coolant. Install the radiator cap and start the engine allow it to reach operating temperature. Once it has reached operating temperature shut off engine and allow it to cool. with the engine cooled off recheck coolant level and top off as needed with the correct blend of coolant.