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Q:

The AC won't blow out air. I found a loose vacuum hose that is worn out. on 2002 Chevrolet Astro

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It is connected to a T connector by the AC unit. Where does the hose connect inside the vehicle?
(1) Answer
This hose connects to the vacuum switch that controls the a/c-defrost servo. If one of these vacuum lines is off or broken, you'll get defrost and nothing else. Common problem.