Ive pulled off the knob and everything is fine i took the whole control apart and everything still looked fine. The only noticable thing i seen was the small electrical contacts inside the control looked a worn out and a bit corroded i cleaned it as best i could but it still doesnt work. And i really dont think the vacuume lines that controls the air flow are the problem because the temperatur control still works and throws out hot and cold air as i choose and they both are connected and work through the same vacume line
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