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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Sounds a lot like a chaffed or cracked vacuum hose, may not hear the leak depending on the location of the leak.
Most likely will need to start inspecting all of the vacuum hoses, not sure what engine you have but there are a few well known issues with vacuum lines and hoses on the modular engines which have a history of chaffing and or cracking from heat in the engine bay..
Most likely will need to start inspecting all of the vacuum hoses, not sure what engine you have but there are a few well known issues with vacuum lines and hoses on the modular engines which have a history of chaffing and or cracking from heat in the engine bay..
