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I just needed to replace the A/C switch in the CCU of my '89 C4. To do this I had to take the CCU apart, including removing all the buttons on the front of the unit. All of mine pulled straight off, and were not threaded on or anything like that. I wonder if a PO could have glued your buttons? I noticed that a knob on one of the center sliders was loose, and just placed a little piece of paper in it to tighten its fit. Perhaps your PO went a step further if he had "loose knobs"?
Good luck,
Tom
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