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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Found it!
I ignored the critical axiom, test like you fly. It only was leaking in recirculation mode and I wasn't testing it that way (because it was cold and I had the heat on) even though that's how I usually have it set. Found several leaks in the hose "under" the hood leading to that baffle. Easy fix with some tubing I had lying around from a previous repair.
Thanks for the feedback!
Mike
I ignored the critical axiom, test like you fly. It only was leaking in recirculation mode and I wasn't testing it that way (because it was cold and I had the heat on) even though that's how I usually have it set. Found several leaks in the hose "under" the hood leading to that baffle. Easy fix with some tubing I had lying around from a previous repair.
Thanks for the feedback!
Mike
