Madscientist
I'm Awesome
I have a 97 crew cab that i have replaced and updated alot of stuff on. It has new hvac control unit in it, (as the temp control did not work prior to new unit.) It was stuck on defrost as the top blend door had fallen in. I tested the operation of all the functions and when the fan is off, everything works as it should. Turn fan on ,(any speed) and the blend door motor centers itself and charging from defrost to feet or both, it ever so slightly works. Anyone ran into something like this?