GM 12622316 Housing,Engine Coolant Thermostat

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Before assuming the thermostat is to blame for a cooling system problem, it is important to check the coolant level, drivebelt tension, and temperature gauge (or light) operation. If the engine seems to be taking a long time to warm up, indicating a stuck open thermostat, it should be replaced with a new one. On the other hand, if the engine runs hot and the lower radiator hose is not hot, it suggests a stuck closed thermostat, which also requires replacement. However, if the lower radiator hose is hot, it indicates that the coolant is flowing and the thermostat is open. To replace the thermostat, start by disconnecting the cable from the negative terminal of the battery and draining the cooling system. Then, locate the thermostat housing by following the lower radiator hose to the engine. Loosen the hose clamp and detach the radiator hose from the thermostat housing, replacing it if necessary. Remove the bolts and detach the thermostat housing, cleaning the mating surfaces on the engine and the housing. Install a new o-ring in the housing and reattach it to the engine, tightening the bolts to the proper torque specifications. Finally, refill the cooling system, check for leaks, and repeat the steps to ensure the repairs have resolved the previous problem(s).