How do you change the thermostat on a 1994 Mazda Protege?

The thermostat is located under the housing at the end of the upper hose that goes from the radiator to the engine. Drain the radiator then remove the hose at the thermostat housing. Unbolt the two bolts that hold down the housing and pull out the thermostat (be sure to notice which end of the thermostat points into the engine. Installation is reverse , making sure that thermostat points in the same direction. Usually, the instructions of how it fits are printed on the package of the thermostat. Good luck.