1998 Ford F-150



April, 3, 2009 AT 9:41 AM

Engine Cooling problem
1998 Ford F150 V8 Two Wheel Drive Automatic 188000 miles

how do I replace the thermastat?


2 Answers



April, 3, 2009 AT 1:35 PM

Below are procedures for removing and replacing your vehicle's thermostat. If your vehicle is equipped with the 5.8L or 7.5L engine please let me know as the replacement procedures will be different.

REMOVAL: Disconnect the negative battery cable.
Drain and recycle the engine coolant.
Remove the power steering reservoir support bracket.
Remove the upper radiator hose at the thermostat housing.
Remove 2 thermostat housing retaining bolts and remove the housing.
Remove the thermostat and O-ring from the lower intake manifold. Discard the O-ring.

INSTALLATION: Clean the O-ring sealing surfaces.
Install a new O-ring, on the thermostat and position the thermostat in the lower intake manifold.
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).
Install the power steering reservoir support bracket.
Fill the engine cooling system.
Connect the negative battery cable.
Start the engine and allow it to reach normal operating temperature while checking for coolant leaks.
Road test the vehicle and check for proper engine operation.
Check the coolant level and add if necessary.

Thanks for using 2CarPros. Com!



April, 3, 2009 AT 1:43 PM

Yes, you did help. Thank you very much. I will attempt this repair tomorrow.

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