I have a 1996 38 ft Navigator with 125,000 miles on it. I am not the original owner. My dash air doesn't work and I dont care, I run the genny if I need air.
The big issues I had when I bought mine (3 1/2 yrs ago ) where a leaking exhaust manifold, look for carbon black areas on the manifold when you lift the bed. Lower areas of the radiator was rotting out, can be seen from outside of coach just open left rear access door, rad had to be replaced. Windows fogged in driver area had some of them replaced. I am repairing the living area windows myself. I bought it cheap enough that these repair costs didn't hurt me as per coach total value. I boiught it $8,000 under book value and spent $5,000 in repairs.
"96" HR Navigator, 38' no slides, Cummins, Allison