Some mechanics like to first remove the distributor for easier access to the thermostat housing but this is not absolutely necessary. It will lead to the aluminum thermostat housing, which is located on the left end of the cylinder head (as you face the engine), just below and to the rear of the distributor. To locate the thermostat housing, follow the large rubber hose that comes off the top right hand side of the radiator (as you face the engine). Replace the drain-plug and make sure it's secure but don't tighten it too much. Undo the plug and allow approximately 2 liters of coolant to drain from the radiator into your pan. Begin by putting the drain pan below the radiator drain-plug. Also, you will need a 14mm box wrench, small needle-nose pliers, new thermostat and new thermostat gasket, a can of WD40 or similar product, a drain pan (the same type used to drain motor oil into), a flash light or better still, an attachable mechanic's light and a few clean rags.įirst, park the car on a flat surface and let the engine cool down to the point you can comfortably touch the radiator cap - or about an hour in 70 degree weather. The tools you will need are: a small ratchet with 12mm socket and one 4-inch long socket extension. It will take about 1 hour, perhaps longer, depending on the condition of the thermostat gasket.
This is not a major repair and can be accomplished in your garage or driveway with some common tools and a medium level of mechanical knowledge. If your 1995-98 Mazda Protege is overheating, there is a good chance you need to replace the thermostat.
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