Chevrolet 96067066 Case,Thermostat

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Before assuming the thermostat is to blame for a cooling system problem, check the coolant level, drive belt tension, and temperature gauge operation. If the engine seems to be taking a long time to warm up, the thermostat is probably stuck open-replace it with a new one. If the engine runs hot, use your hand to check the temperature of the upper radiator hose. If the hose isn't hot, but the engine is, the thermostat is probably stuck closed, preventing the coolant inside the engine from escaping to the radiator. Replace the thermostat. Caution: Don't drive the vehicle without a thermostat. The lack of a thermostat may cause the computer to stay in open loop, causing emissions and fuel economy to suffer. If the upper radiator hose is hot, it means the coolant is flowing and the thermostat is open. Consult the Troubleshooting section for cooling system diagnosis. To replace the thermostat, disconnect the negative battery cable, drain the cooling system, remove the air cleaner, follow the upper radiator hose to the engine to locate the thermostat housing, loosen the hose clamp and detach the hose from the fitting, unplug the electrical connector for the engine cooling fan switch, remove the bolts and detach the housing cover and bracket, if equipped, tap the cover with a soft-face hammer to jar it loose, note how it's installed and remove the thermostat, thoroughly clean the sealing surfaces, install the new thermostat in the housing, make sure the air bleed is positioned correctly and the spring end is directed into the engine, install a new gasket over the thermostat, install the cover and bolts, tighten the bolts to the torque, reattach the hose to the fitting and tighten the hose clamp securely, refill the cooling system, start the engine and allow it to reach normal operating temperature, then check for leaks and proper thermostat operation.