Ford 1L2Z-8575-AA Thermostat Assembly

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Before concluding that the thermostat is at fault for a cooling system issue, inspect the coolant level, drive belt tension, and the operation of the temperature gauge. If the engine seems slow to warm up, based on the heater output or temperature gauge, it's likely the thermostat is stuck open and needs replacing. Conversely, if the engine runs hot but the upper radiator hose isn't, the thermostat might be stuck closed, blocking coolant flow to the radiator, necessitating its replacement. Don't drive without a thermostat, as it can impact emissions and fuel economy. If the upper radiator hose is hot, it indicates the coolant is flowing and the thermostat is functioning. To replace, disconnect the cable from the negative battery terminal. Drain the cooling system and, if the coolant is still in good condition, consider reusing it. On V6 models, disconnect the alternator harness bracket, and for 2003 and earlier V8 models, remove the engine trim cover. Trace the upper radiator hose to the engine to find the thermostat housing. Loosen the hose clamp, and if necessary, remove the deteriorated hose. Should the thermostat housing cover show signs of corrosion or damage, replace it. For V6 and V8 models, remove the fasteners, detach the thermostat cover, note its orientation, and then remove the thermostat. Clean off old gasket residue and fit a new rubber gasket onto the thermostat, then place it in its designated housing. Secure the thermostat housing cover, reattach the radiator hose, and ensure the hose clamp is snug. Refill the cooling system, start the engine, let it reach its normal operating temperature, and finally check for leaks and proper thermostat functioning.