On almost all cars, the thermostat housing is right where the top radiator hose meets the engine itself. Drain 50% of the coolant,remove the housing bolts, remove the thermostat (note how it is positioned so you don't put the new one in upside down) scrape the old gasket material off the engine and housing, put new thermostat in, put new gasket in place, attatch housing with bolts (don't overtighten)...and refill with coolant. If there is a screw on the housing, start car, loosen screw until coolant starts to come out with no bubbles. This will bleed air out of the system so the motor doesn't overheat.
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that is the cooling fan relay.
no sensor only a thermostat
If your heater does not work on your 94 Mazda Protege, check the thermostat. You can also check the heater fuse to ensure it has not blown.
follow the bottom radiator hose up to the engine and remove the two bolts an you should see it
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