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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Wow. This got going. My issue is solved. As I posted, there was still vacuum more than a half hour after the engine was turned off so all the other lines are good and so is the accumulator. I've had an issue with this line before. It's not shielded and it's exposed to heat, etc. Looking to replace the entire thing.
I've put 50,000 miles on this rig with plenty of high throttle extended uphill running and I've never run out of vacuum. YMMV.
Mike
I've put 50,000 miles on this rig with plenty of high throttle extended uphill running and I've never run out of vacuum. YMMV.
Mike
