Having problems with your 1999 GMC Suburban ?

Air keep's coming out of defroster vents and want it to come out of dash vents

Posted / edited by AnonymousUser on : 19-04-2021

Answers :

Check for vacuum leaks on the engine. The air doors are vacuum controlled, and when they have no vacuum they only blow on the window.
Repair Help & Product Troubleshooting for 1999 GMC Suburban

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