Searched the threads and couldn't find a definitive string to help. Got *really* warm here in Detroit for the first time, mid '80's, and I had the AC on. Working fine except now the fan is stuck on "medium" speed and I can't shut off the climate control. Press high and it goes to high and press low and it stays on "medium" speed. Temp works fine, various directional levels work fine. Just won't shut off and won't even go to "low" on the fan speed. Also, rear seat duct not working but I think that one is due to the lever.

TIA

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1979 300SD
1975 450SL
2014 Ram Cummins Megacab (tow rig)