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12-28-2012, 07:58 PM | #1 | |
AF Newbie
Join Date: Aug 2004
Location: Valparaiso, Indiana
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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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12-28-2012, 10:01 PM | #2 | |
AF Enthusiast
Join Date: Jul 2005
Location: troy, Ohio
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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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Automotive A/C Engineer with: '99 IH 4700 Toy Hauler (2) '95 GEO Prizms both maroon '99 GMC Yukon '95 Chev 3500, 454 Dually Crew Cab- 145k miles- Wife's Camel trailer puller. '94 Astro- 370k miles '94 Firebird Formula- 5.7L 180k miles- gone- '92 Chevy Lumina Van 3.8L 264k '86 GMC S-15 - 2.8L 154k '87 Buick Park Ave . 187k '86 Buick Park Ave 3.8L 199k miles- gone '77 Chevy Vega- 2.5L 175k miles gone but not forgotten '68 Camaro 396 4 spd RS/SS -72k miles- |
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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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