Thermostat stuck open? Test it before you replace it

Thermostat stuck open? Test it before you replace it

Engine cooling problems are often the fault of the lowly thermostat, which is a simple device that resides between the radiator and the engine block to regulate when engine coolant is circulated. When something goes wrong with the thermostat, it can either become stuck open or closed, restricting or allowing full flow of the coolant whether conditions merit that or not.

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