Question about 1989 Cadillac Sedan DeVille

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1989 Cadillac heat flow system is not flowing properly. Ive got heat low, med, and high the motor is kicking on but its not blowing out at the right strength. What would be the issue? Is there a cabin filter that I dont know about or is it something else?

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Check to see if the air is coming out of the defrost vents up on top of your dash...by the windshield. If this is the case...you have a vacuum line that has either come loose under the dash....or....the vacuum controller located behind the AC/Heat controller is not functioning properly. ( Tip....Vacuum is what actuates the "doors" inside your AC/Heat plenum...directing airflow straight out front vents...up to the defrost....and down to the heat.....

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Posted on Jan 02, 2011

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Posted on Jan 02, 2017

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