To replace a Ford Explorer thermostat, disconnect the hoses blocking access to the thermostat housing, and then remove the thermostat from the housing. Drain the coolant beforehand, and then flush the system afterward.
- Drain the coolant
Position a bucket underneath the radiator drain plug. Unbolt the plug, and allow the fluid to drain.
- Remove the air cleaner tube
Disconnect the outlet tube from the air cleaner.
- Remove the alternator wires
Disconnect the wires from the alternator, and then set the harness aside.
- Remove the radiator hose
Move the bucket near you. Apply a spray lubricant to the radiator hose, and then disconnect it from the thermostat housing. Place the hose in the bucket to collect excess coolant.
- Remove the thermostat housing
Loosen the bolts on the thermostat housing, and disconnect it.
- Remove the thermostat
Remove the thermostat, and replace it with a clean rag.
- Install the new thermostat
Remove the rag. Install the new thermostat in the same way as the old, and then install a new O-ring seal.
- Reattach the housing
Reattach the thermostat housing, and torque the bolts to the manufacturer's specifications.
- Return the rest of the parts
Reattach the radiator hose and air cleaner tube.
- Fill the radiator reservoir
Fill the radiator reservoir with radiator flush. Drain the flush, and then fill the reservoir with coolant.