insufficiant cold air from vents, 2000 montana

[milkbonz]

weird thing happening. i am not very mechanical but here is my problem. when i have the ac on and set to the dash vents(or face diagram)cold air only comes from the right side of the 3 middle vents all others are warm, and when i use the winshield defrost it comes out of there only when the dial is turned to hot and when i turn it to cold you can here it blow but does not come out the windshield defrost vent. anyone else have these or heard of these situations.help would be appreciated.

milkbonz

[gonzosimme]

I had a similar problem with our 97 Montana, it turned out to be a vacuum
line leak. There is a vacuum line (small dia. hard plastic )that runs over the left side of the motor right overtop of the fanbelt, it had dropped down onto the belt and wore a hole in the bottom side, out of sight.
I used a pc of rubber hose to splice between the 2 ends after cutting out
the hole and it works great now.