Well if it's anything like my 89 Regal Gran Sport, a vacuum line leak is likely. Last fall I discovered none of my heating a/c buttons did anything...at about the same time I noticed a vacuum line from the plenum had pulled away from a check valve near the cruise controller. I didn't connect the two..until I replaced the check valve ($10) and realized one of the lines off the valve fed the dash controller. Bingo! The buttons work fine (they hadn''t worked since I owned the car) The moral of the story? Check all your vacuum line and inter-connections before you shell out good money for a new controller.
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