A/C Heater air flow

11-12-2012, 05:55 PM
On my 99 montana the air flow doesn't change when the position selector knob is moved to a different position. Most of the air comes out of the floor vents, but a small amount comes out of the upper vents. I have checked the vacuum lines in the engine compartment & they are good. Does anyone have any ideas what My problem could be & how to fix it? Thanks

Tech II
11-13-2012, 02:09 PM
Go under the dash on the passenger side and find the vac source line....with the car running, does it have vacuum? It is usually purple or black in color....

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