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08-21-2019, 07:36 PM | #1 | |
AF Newbie
Join Date: Aug 2019
Location: Matthews, North Carolina
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AC only blows through defrosters
As stated in the title, air only blows out of the windshield vents. I can change the speed, and the air blowing doesn’t get too hot or cold but I will charge with Freon after I fix the issue. I’m not sure if the blend door needs to be switched or if there is a leak in a vacuum.
2004 Expedition 4.6L |
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08-22-2019, 10:47 AM | #2 | |
AF Enthusiast
Join Date: Jul 2005
Location: troy, Ohio
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Re: AC only blows through defrosters
If your vehicle uses vacuum to control mode doors, then you most definitely have a vacuum leak- usually at or near intake manifold where rubber and/or plastic hoses get brittle and break....
For safety reasons, if vacuum supply is lost, the doors are spring loaded to default to defrost to be able to clear the windshield if they fog up.
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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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01-23-2020, 09:22 PM | #3 | |
AF Newbie
Join Date: Jan 2020
Location: Jacksonville, Florida
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Re: AC only blows through defrosters
To check the vacuum line, you need to remove the battery.
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