Where's the Air?

courtesy of Bob, The Auto Answer Man


Bob,
I have a 1992 VW Jetta and I have a problem with the air flow vents not working. Currently the air flow only comes through the top of the dash board. The levers for the air flow are not stuck, they move freely. It just seems that whatever vent door the lever is supposed to operate is stuck in the one position. No matter if I move the lever to any of the 3 A/C positions, or the vent position, or the windshield defrost position, the air will only blow out of the windshield defrost vents.

I pulled the radio out of the dash to see if possibly the cable from the lever had become disconnected but it appeared to be fine. A friend of mine mentioned that the vent doors may be vacuum operated and that there may be a vacuum leak or a problem with a vacuum motor. Do you have any suggestions on how to identify my problem for sure and give me an idea for what repairs might cost me.
Pat

Pat,
Your friend is correct. You have a vacuum leak. You will need to find the main line that comes in from the engine and fist make sure that it has vacuum when the engine is running, then find all the diverter valves and make sure that vacuum is switched to them when they are turned on... Finally, if all the lines are good, then it is a bad diverter valve.
Good Luck!
Drive Safely!
Bob, The Auto Answer Man


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