The sudden failure of an inexpensive part can leave you and your vehicle stranded by the side of the road. This is especially true of the cooling system thermostat. The thermostat resides in between your engine and your radiator and acts as a temperature controlled engine coolant valve. If the valve fails, so does your cooling system and an overheated engine, and driver, often are the unfortunate end result. The good news is thermostats are inexpensive and relatively easy to replace. Thermostat Removal & Installation 1. Disconnect the negative battery cable. 2. Drain and recycle the engine coolant. 3. Remove the Power Steering reservoir support bracket. 4. Remove the upper radiator hose at the thermostat housing. 5. Remove 2 thermostat housing retaining bolts and remove the housing. 6. Remove the thermostat and O-ring from the lower intake manifold. Discard the O-ring. To Install: 7. Clean the O-ring sealing surfaces. 8. Install a new O-ring, on the thermostat and position the thermostat in the lower intake manifold. 9. Place the thermostat housing on the lower intake manifold and install 2 retaining bolts. Tighten the bolts to 15-22 ft. lbs. (20-30 Nm). 10. Install the power steering reservoir support bracket. 11. Fill the engine cooling system. 12. Connect the negative battery cable. 13. Start the engine and allow it to reach normal operating temperature while checking for coolant leaks. 14. Road test the vehicle and check for proper engine operation. 15. Check the coolant level and add if necessary.
thermostat install
Raise or lower the temperature to change the reading on the thermostat.
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The thermostat is located in the housing at the engine end of the top radiator hose.
Open the hood and find the upper radiator hose. Follow this hose to the engine and you will see the thermostat housing. There are two bolts holding the housing on. Unscrew these bolts and you will see the thermostat.
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According to the 1998 Ford Expedition owners manual : For either the 4.6 liter or 5.4 liter V8 engines : With engine oil filter change : ( 6.0 quarts )