air will only blow through defrost vents when air conditioner is on in my 1998 chevy astro van

Asked by Jul 30, 2015 at 11:11 AM about the 1998 Chevrolet Astro LS Passenger Van Extended

Question type: Maintenance & Repair

1 Answer

216,825

Check the vacuum lines and connections. If there is a crack or leak, the A/C defaults to the defrost.

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