Question about 1989 Oldsmobile Cutlass Supreme

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Can't turn the heater off.

To clarify my 89 olds heater problem, I can't turn off the blower motor, and the temp is always very warm/hot. I turn every button off and it still blows hot air. Now, I can turn the blower up but it never shuts all the way off.

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If none of the controls on the heater/AC panel are working, then you have a vacuum problem and the default position is the heater setting. There's a diagram of the vacuum system on a label on the front under the hood just in front of the radiator. It's a very simple system so don't be overwhelmed.
If the label is gone, go to your local library and check the Chilton's manual.
Your system must have vacuum to the switches for any kind of control. Be carefull of the small vacuum lines under the hood. Most at this age are very brittle.
Hope this helps, Rick.

Posted on Jun 02, 2009

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