Ford E5TZ-8575-C Thermostat Assembly

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Before assuming the thermostat is to blame for a cooling system problem, check the coolant level, fan operation, and temperature gauge (or light) operation. If the engine seems to be taking a long time to warm up (based on heater output or temperature gauge operation), 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, preventing the coolant inside the engine from escaping to the radiator. Replace the thermostat. Caution: Don't drive the vehicle without a thermostat. The computer may stay in open loop and emissions and fuel economy will suffer. If the upper radiator hose is hot, it means that the coolant is flowing and the thermostat is open. Drain the radiator so that the coolant level is below the thermostat. Remove the coolant outlet elbow attaching bolts, then pull the elbow away from the cylinder head sufficiently to provide access to the thermostat. Remove the thermostat and gasket, noting the top and bottom to assure proper installation. Disconnect the bypass hoses at the water pump and intake manifold. Remove the bypass tube, then remove the water outlet housing attaching bolts. Bend the radiator upper hose upward and remove the thermostat and gasket, taking note of the top and bottom to assure proper installation. After cleaning the coolant outlet elbow and cylinder head gasket surfaces, coat a new gasket with water-resistant sealer and position the gasket on the cylinder head opening. The coolant elbow contains a locking recess into which the thermostat is turned and locked. Install the thermostat with the bridge section in the outlet elbow. Turn the thermostat clockwise to lock it in position on the flats cast into the elbow. Position the elbow against the cylinder head and tighten the attaching bolts. After cleaning the water outlet gasket surfaces, coat a new water outlet gasket with water-resistant sealer. Position the gasket on the intake manifold opening. Install the thermostat in the intake manifold with the copper element toward the engine and the thermostat flange positioned in the recess. Position the water outlet housing against the intake manifold and install and tighten the attaching bolts. Install the water bypass line and tighten the hose connections. Fill the cooling system with the proper amount and type of coolant. Start and run the engine until it reaches normal operating temperature, then check the coolant level and look for leaks.