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Air through vents only when driving

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Old Apr 27, 2014 | 07:18 AM
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mikeg135
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Air through vents only when driving
So I have a strange one.

My trucks A/C only blows through the vents when the truck is moving. At stop lights it only blows through the defrost.

Any thoughts?
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Old Apr 27, 2014 | 08:57 AM
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leaking vac lines or bad check valve. Rotted or split hoses in vac harness at firewall.
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Old Apr 27, 2014 | 11:13 AM
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As said, the system defaults to defrost upon loss of vacuum. Replaced a bunch of my lines with rubber to get rid of the plastic of stock lines. It gets brittle with age and heat and snaps very easily.
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Old Apr 28, 2014 | 05:18 PM
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Ok, thanks. Will check that.
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Old Apr 28, 2014 | 11:26 PM
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That tee at the firewall was rotten on mine.

The rest of the lines looked good.
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