1989 ford ranger thermostat replacment - 1989 Ford Ranger

First remove the bolts from the thermostat housing which is connected to the top hose on the radiator. Grasp the thermostat with either hand or pliers and remove, next use a scraper or wire brush to clean the surface on the engine and on the thermostat housing. Both surfaces need to be clear of debris, you should be able run finger accross surface and feel no bumps(it should be smooth). Then place the thermostat back in same orientation as old one came out and place gasket on thermostat housing (pay attention some gaskets have paper covering self adhesive). Place bolts through housing and gasket, thread the bolts into engine until finger tight then use socket to tighten snug but do not force tight.