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Heating interior problems

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Hello, I have a problem with heating and wanted to see what could cause this problem. I have a 1988 Cadillac Deville and when I am driving and anytime I begin to stop at a light, stop sign, etc., the heater blows out cold air. What can this be? Thanks!

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sounds like low coolant to me. Have you checked it?

Welcome To Caddyinfo forum.

Thank You, Rockfangd. Yeah, I always check the antifreeze level, and it is full. Could it be a thermostat? heater core? vacuum line? I really do not know what else it could be. I flushed the radiator out last year, so I ruled that out. What else do you think it could possibly be? Thanks for your help!

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  • 2 weeks later...

Possibly a vacuum leak in the mixer door actuator or the programmer, if the 1988 model has such a thing.

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