Mechanics

HEATER BLOWS OUT COLD AIR

1998 Cadillac Catera

Heater problem
1998 Cadillac Catera 6 cyl Four Wheel Drive Automatic

What would make my heater blow out cold air? We have already replaced the thermostat.
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BordenL
November 30, 2009.




You have a heater control valve that is in the rear of the engine, and somewhat difficult to access. There is a vacuum line going to it. You need to determine if vacuum is getting to that valve. I am not sure if it needs vacuum to let hot water flow to the core, or if no vacuum allows it to flow. It could also have a faulty diaphragm, and therefore be non-functional.
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Factoryjack
Dec 1, 2009.
Did you figure out problem. I too have the same problem. I am told that the dash needs to come out and the acuaitor (sp?) Maybe bad. I hate this car.

Tiny
52xmax
Dec 9, 2009.

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