Ford F5DZ-8575-A Thermostat Assembly

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Before assuming the thermostat is to blame for a cooling system problem, check the coolant level, drivebelt 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 the thermostat 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. Replace the thermostat. If the upper radiator hose is hot, it means that 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, and locate the thermostat housing. Loosen the hose clamp and detach the hose from the fitting. On V8 engines, remove the distributor vacuum diaphragm if necessary. Remove the bolts and detach the housing, then remove the thermostat. Clean the gasket mating surfaces and install the new thermostat, making sure to rotate it to lock it in position. Install the thermostat housing, reattach the hose, and refill the cooling system. Start the engine and check for leaks and proper thermostat operation.