GM 12622410 Thermostat Assembly, Engine Coolant

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Before assuming the thermostat is the cause of a cooling system problem, it is important to check the coolant level, drivebelt tension, and temperature gauge operation. If the engine takes a long time to warm up or the heater output is not sufficient, it is likely that the thermostat is stuck open and needs to be replaced. On the other hand, if the engine runs hot and the lower radiator hose is not hot, it indicates that the thermostat is stuck closed, preventing the coolant from escaping to the radiator. In this case, the thermostat should be replaced. However, if the lower radiator hose is hot, it means 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 any excess coolant. Then, detach the hoses from the thermostat housing cover and remove the cover. Take note of how the thermostat is installed and remove it. Clean the housing and cover from any old gasket material and sealant. Install a new rubber gasket on the thermostat and place it in the housing. Reattach the thermostat cover and bolts, making sure to tighten them to the proper torque specifications. Finally, reattach the radiator hose, refill the cooling system, and check for leaks and proper thermostat operation.