Question about 1999 Chevrolet Malibu

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99 malibu not blowing heat or making noise

It's very cold right now, -15 with wind chill. No heat in car. Any idea what you think it might be?

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Since you did not mention it, I'll assume the blower is blowing? Preliminary checks to system are: Make sure coolant level is full and has the proper antifreeze mix (heater core can freeze up pretty quick)
If you have a heater control valve make sure it's working. Make sure that there is flow through heater core. one hose going to it should be really hot, the exit hose should be slightly less hot but not cold. Make sure that the plenum door inside the car in the heater box is moving when you change setting from a/c to heat. In checking these things, it's likely you will find the problem or a good clue to it's origin.
good luck

Posted on Jan 16, 2009

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