Ford Ranger Maintaince And Repair Manual page 286

To install:
Do not use a sharp metal tool for scraping. Damage to the sealing surfaces could result and cause a leak.
8. Clean all mating surfaces thoroughly.
9. Make sure that the sealing ring is properly installed on the thermostat rim. Position the thermostat in
the housing making sure that the air release valve is in the up(12 o'clock) position.
10. Coat the mating surfaces of the housing and engine with an adhesive type sealer. Position the new
gasket on the thermostat and place the housing on the engine. Tighten the bolts to specification.
5.0L Engine
1. Drain the cooling system.
When draining the coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are
quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove
fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless
it is contaminated or several years old.
2. Disconnect the battery ground.
3. Remove the upper radiator hose.
Exploded view of the 5.0L engine thermostat and related components
4. Remove the 2 thermostat housing attaching bolts.
5. Loosen the bypass hose at the water pump.
6. Remove the thermostat housing. You may have to tap it loose with a plastic mallet or your hand.
REMOVAL & INSTALLATION
HOW TO USE THIS BOOK
WARNING
CAUTION
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