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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Look for this vacuum reservoir under/near the front right area. They have a tendancy to implode near the plastic welds. It will impact your ac controls.
