Ford Ranger Maintaince And Repair Manual page 285

Ensure that the sealing ring is properly seated. Install the thermostat with the release valve
5. Remove the 3 thermostat housing attaching bolts.
6. Remove the thermostat housing. You may have to tap it loose with a plastic mallet or your hand.
7. Pull the thermostat from the intake manifold.
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HOW TO USE THIS BOOK
Pull the thermostat housing from the intake manifold ...
... then remove the thermostat
facing upwards
REMOVAL & INSTALLATION