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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Jeeze JimDandy, nothing like reviving a LONG DEAD thread, OP found their problem and fixed it RIGHT nearly one year ago.. AND it didn't require a bunch of hokey aftermarket parts..
