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1990 Buick Electra Park Avenue 3.8L (Climate Controls Not Working)

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6 years 1 month ago #19543 by gav09
Sounds like you have a vacuum leak somewhere. HVAC controls on that are ran by vacuum I believe(being lazy and not looking it up). When HVAC doors are operated by vacuum and vacuum to the doors is lost defrost is the default for safety reasons. Keep looking for your vacuum leak.

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