Two good indicators of when to replace the car's thermostat:
* When you have to run the heater (no matter what time of the year) in order to keep the engine coolant from overheating, * When you no longer get ANY heat from the heater core.
WE DON'T KNOW!
If you do not know how to replace it, then you should not try to replace it. If you want to know WHERE it is, then look near the thermostat housing.
Need to know which engine you have.
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Replace your thermostat whenever you replace the coolant and service the cooling system. Also replace it if you suspect it is sticking.
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