A/c vents to defrost

Old Jun 19, 2020 | 03:45 PM
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From: LOCKNEY, TX
A/c vents to defrost

My f150 is a 1999. When i push the gas the air will switch from the vents and blow out of the defroster. When i let off the gas air comes back to a/c vents. Any ideas or advice? Thanks
 
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Old Jun 19, 2020 | 03:51 PM
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glc
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From: Joplin MO
You have a vacuum issue. Check the small hardlines behind the battery, check the accumulator between those lines and where the lines enter the cab.
 
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