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Q:

heating/air conditioning controls on 1997 Buick LeSabre

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My climate control doesn't work all the time, it is stuck on defrost. How do I find the source of the problem? Already checked and replaced all the fuses I could find.
(1) Answer
you're climate control module is bad (located behind the glove box and accessed by removing the under dash kick panel on the passenger side. Visually it has a group of colored vacuum hoses all connecting to one area of a black box. It operates with the assistance of vacuum from the motor and you'll most probably need a new vacuum hose assembly with the module. Have a professional diagnose it and replace it. It's sort of a headache to do.