Hello everyone, I have a 77 450SL and I can't for the life of me figure out how to operate the climate control. It has 2 sliding ***** with confusing information . I can't figure out what is the defroster, heater or AC. Does anyone have the pages of the owner's manual that explain or can someone explain it to me. Thanks in advance, Billybuck fromk Phoenix (where I'm going to need the AC soon)