dash vents
if diesel, after the coach sits overnight, get someone inside to turn the ing key to the on postion while you are outside in front (away from the buzzers) and listen for the electric vac pump to pull vac and shut off. vac pumps are somewhat noisy.
if pump not running, fix that. if pump running and will not quit running,vac leak somewhere fix that. if pump ran and then stops (vac is pulled) then move dash control , listen for vent (door) to move or maybe hear vac leak.
If all else fails the (door) may be stuck even with vac on it. Yes, fix that.
The vac system works sorta like a air system in reverse. It uses vac to move stuff instead of air pressure.
good luck
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2000 NATIONAL TRADEWINDS 7370 - FREIGHTLINER XC - 3126B CAT 300 HP ALLISON 6 SPEED
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