Mechanics

REPLACING A THERMOSTAT

1999 Ford Expedition

Heater problem
1999 Ford Expedition V8 Four Wheel Drive Automatic 130000 miles

How to replace a thermostat in a 1999 Ford Expedition Eddie Bauer
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Kukima1359
October 23, 2009.




Hello and thanks for the donation!

What size engine is this for? 4.6L, 6.8L etc?
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Bluelightnin6
Oct 23, 2009.
5.4L

Tiny
Kukima1359
Oct 23, 2009.
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.

Let me know if you need further assistance with this repair.

Bluelightnin6
Oct 23, 2009.

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