on my 1986 420 sel the rear vents for the a/c were working fine and just as I went to switch the air in the back off the switch got hard to move and would move back to a certain position anytime I moved it.
NO AIR COMES OUT IN THE REAR.
I think it is a problem with the switch because it feels different when I try to move it. It would be very helpful if someone can give me an idea what may be wrong and how the rear vent works with the cable that looks like it goes to the front of the car.