2001 honda civic ex 4door i have been having problems with my car over heating for the last month sometimes not always i change the thermosta, water pump, timing belt, and radiator and was fine after that for about two weeks and i check the radiator and its not leaking and when i turn my heater on no hot air comes out its just cold air and the a/c light in the dash turns and my a/c fan turns on if i let it run for 5 minutes the temp. goes up i checked it for leaks from heater core and there nothing the coolant is coming out of the reservoir. i can any body help me.
for starters, if you are running the defroster the a/c compressor will engage and the condensor fan will kick on as needed to reduce system pressure. anytime you use your defroster, the a/c comes on to help dehumidify the air (hard to remove moisture from the windshield with humid air, right?). so i wouldn't spend too much time tracking down the a/c problem. if you changed the thermostats and THEN the radiator, you may have plugged up your new thermostats with residue from the old radiator before you replaced it.
OR... WORST CASE SCENARIO: you've got a bad head gasket and compression gasses are leaking by into your cooling system and forcing the antifreeze out of the overflow.
take it to a qualified mechanic and be open minded!
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