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I been having issues with the A/C, heater adn defrost controls on my C4. Sometimes they work and other time they don't. Any ideas tha I can have checked out?
From your description I suspect the Control Head's button contacts need to be cleaned. A fairly easy job for any one with just a little mechanical ability.
One additional suggestion: Use a towel under the Control Head when you disassemble it. That towel will prevent tiny screws and other parts from rolling onto the floor and disappearing! Please don't ask how I discovered this trick!