Heat question
CF Veteran
Joined: Aug 2011
Posts: 1,031
Likes: 4
From: Blue Springs, MO
Year: 1993
Model: Grand Cherokee
Engine: 4.0L Laredo
a vacuum leak would make the vents default to defrost only, regardless of settings. If air doesn't come out the defrost vents, it's probably a stuck vent door. I think it's called a blend door. Someone on here will no doubt point you to a "how to" article to help with what to look for.
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