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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For some reason the resevoir is not holding vacuum. There can be a leak just about anyplace but I would look where ever some kind of work has been done.
I once fixed this sympton on a car that had a battery changed. They pinched the vacuum line under the edge of the battery and it took a couple of years for it to rub though.
I once fixed this sympton on a car that had a battery changed. They pinched the vacuum line under the edge of the battery and it took a couple of years for it to rub though.
