1995 Ford Ranger thermostate

Let the engine cool off, then drain it down about a gallon, there is a draicok on the bottom of the radiator, then follow the upper radiator hose to the engine, there you will find the thermostat at the end of the hose, unbolt the two bolts. leave the hose attached to the housing. Scrape old gasket from both mating surfaces, install new thermostat, spring towards the engine. install the gasket, snug the housing bolts! Not to tight and bring the housing down evenly. refill the coolant and that's it!

This is a general guide, I need your engine size to get specific! However, on most if not all Fords, follow the upper radiator hose, it takes you to the thermostat, then remove the two bolt, and pull off the hose and housing together, scrape any old (flat) gasket off, and reverse the steps to install it. Round O ring gaskets dont need scraping!