Question about 1991 Chevrolet Cavalier

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My heater doesn't work

I just changed the anti freeze , changed the thermostat, and all the fuses but only cold air comes out. does it have anything to do with the heater core

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Water pump

Posted on Dec 23, 2008

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On the front of the engine, on top near the big upper hose goose neck and nestled between the runners of the intake manifold is a small nipple that looks like a brake bleeder (10MM). This is a cooling system bleeder, a close cousin to the brake bleeder. When opened it will purge the system of air- likely the culpret you are experiencing. on a cold or just warm engine, this can be slightly opened with a wrench and the air can be "Burped" out. Attach a 1/4" clear hose to the nipple and open the bleeder until you see all the air has left the manifold. (Run the hose into a bucket and dispose of the used anti-freeze properly.)
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