4WD vs AC?
Ok, just bought a 2000 F350 7.3PSD. When I switch to 4WHigh with the AC on, the damper switches from the dash air vents to the windshield air vents. After about 30 seconds to a minute, it switches back to normal. I think that the 4WD is activated by vacuum but I don't think the AC damper is. If the AC damper is, could the 4WD vacuum be borrowing from the AC damper vacuum?
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