2002 Mazda protege heater only blows cold air and engine is over heating. What could be wrong with this car?
1. See if simply adding coolant fixes it.
2. Try replacing the thermostat and the radiator cap. One way to check the thermostat is to start the engine and feel the upper radiator hose. The hose should not feel uncomfortably hot until the engine has warmed-up and the thermostat opens. If the hose does not get hot, it means the thermostat is not opening.
2. Look for antifreeze leaks, inspect the radiator, water pump and hoses.
3. If there are no leaks, and the above steps don't correct the problem, you might have a blown head gasket.
Check two things:
Check for a wet passenger side floor area. If it's wet, then you have a bad heater core.
Check to see if your engine oil is white / milky. If it is, you have a blown head gasket, and water is getting into the oil.
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