GMC 12681132 Housing Assembly, Engine Coolant Thermostat

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Before assuming the thermostat is the problem, check the coolant level, the drive belt tension, and the temperature gauge. For a 3.4L V6 engine, the top engine cover needs to be removed as well as the battery and battery tray. The exhaust crossover pipe should be removed, and then the thermostat housing bolts can be unscrewed to detach it.

Before proceeding to blame the thermostat, check the level of coolant, and the tension of the drivebelt. Disconnect the battery cable on four-cylinder models, drain the cooling system, loosen hose clamps, and remove hoses from the thermostat housing cover. Remove nuts from the thermostat cover then remove the old gasket and thermostat insert the new gasket and thermostat reattach the radiator hose refill the cooling system. Undo the hose clamp for 3.5L and 3.9 L V6 models and disconnect the hose at the fitting on the thermostat housing, pull off the housing cover, pull out the old stat in one piece with seal, insert new rubber seal inside housing cover with new stat, replace housing cover.

If the lower radiator hose is hot, it means that the coolant is flowing and the thermostat is open.

t-stat is only serviced with the 12681132 per vin#