[MPerry]

I have not tried to remove the dash yet, but have crawled under it. I too have some inoperable dash items, including wipers to be addressed down the road. My wiper motors are Trico APMP and found a source for parts at rometruckparts.com. Regarding your air leak, it seems to me the air supply pushes the blade back and forth, so theres 2 supply lines, and an exhaust. The exhaust just runs down through a hole in the floor. If the wipers work it may just be that this exhaust line has come off blowing air out under the dash instead of below the floor. I am not sure getting the dash out is going to be a huge help, the motor is still pretty far down and forward.