I'm having a problem in my 99 D with the switch that changes the air flow from A/C to heat to defrost. The air comes out of the defrost if you put it on A/C the air gets cool but still blows on the wind shield. Has anyone had this kind of problem before? :help:
I may be too late, but had the exact same problem on my 2001 Ram. Turned out to be a manifold gasket leak. As it was explained to me, the system works off of a vacuum and the leak did not system to function.