Diagnosing a HVAC vacuum issue on a Ford F53
The AC/heat is switching to the defroster under higher RPM conditions on my 2006 F53 chassis Damon. It actually seems to be doing it now under low throttle steady state conditions as well. Obviously...
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Well, I'd like to thank JimDandyAZ for his post. It has helped me tremendously with a problem that has been plaguing me for almost two years. THANKS FOR reviving this thread and reposting this information.
