The thermostat housing bolts are tightened to original equipment manufacturer (OEM) specifications using a calibrated inch-pound torque wrench.A new gasket is applied and the thermostat is re-installed in the correct orientation and with the temperature sensing cylinder facing downward towards the engine. All mounting surfaces on the thermostat housing are cleaned of old gasket material.Note that some cars have more than one cooling system thermostat and both might need replacement. The thermostat housing is removed and the thermostat and gasket are extracted.Once the engine is completely cold, the radiator cap is loosened and enough coolant is drained from the radiator so the coolant level is below the thermostat housing.How do mechanics replace the engine cooling system thermostat?
COOLANT THERMOSTAT REPLACEMENT NEAR ME INSTALL
Therefore, if the cooling system is already open for major repairs, such as water pump or radiator replacement, it is recommended to install a new thermostat simply as insurance against future breakdown. Your dash-mounted temperature gauge will notify you of this malfunction. Thermostats can get sticky, causing the engine temperature to stray from the optimal range. Temperature gauge reads too low or too high.If so, it would be repaired prior to replacing the thermostat. Since it is usually not known how badly the engine overheated, the mechanic will also try to determine if there is evidence that the cylinder head gasket was blown. However, since there are other causes of overheating, a mechanic will thoroughly inspect the cooling system prior to condemning the thermostat. A thermostat with the valve stuck closed is a common cause of engine overheating. When to consider replacing the engine cooling system thermostat:
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