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Old 12-28-2012, 07:58 PM   #1
Heeb
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AC Ductwork Vacuum Leak???

My 2008 Econoline has an issue whenever I accelerate. Air conditioning switches from the dash vents to the defrost vents. When I decelerate, it goes back to the dash vents (normal). Fan speed doesn't matter. Any ideas? Are the dampers operated by a vacuum line?
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Old 12-28-2012, 10:01 PM   #2
brcidd
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Re: AC Ductwork Vacuum Leak???

yes- vacuum leak underhood most likely- trace the line- look for cracked or broken reservoir line..
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Old 12-29-2012, 08:22 AM   #3
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Re: AC Ductwork Vacuum Leak???

Like he says,vacuum leak,most likely before controls. System is designed to default to defrost with loss of vacuum. Theres a vacuum tree at the top,center of the dashboard. Remove panel and check hoses. Check hoses going back to the engine compartment. If this is a diesel engine check the vacuum pump and it's hoses.
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