Upper vents don't work?
Thread Starter
Melting Slicks
Joined: Jun 2001
Posts: 2,020
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From: Chicago IL
Upper vents don't work?
My upper vents don't work. I can feel air on my legs, but nothing is coming out of the upper vents. I don't have electronic climate control and the vents dont' work with heat or the A/C.
Any suggestions would be helpful. :yesnod:
Any suggestions would be helpful. :yesnod:
Instructor
Joined: Apr 2002
Posts: 237
Likes: 0
From: KALAMAZOO MI
Re: Upper vents don't work? (Midnight)
If you mean the face level "facia" vents, you need to tighten the vacuum hoses on the 5 way "T" fitting which is located on the firewall under the drivers side dash. You will have to remove the knee bolster panel, lay on your back with a flashlight and look up there to see it but it's there!! I just had this done to my car.
Racer
Joined: Sep 2001
Posts: 259
Likes: 0
From: Pontiac IL
Re: Upper vents don't work? (INDEBT4MYVETTE)
The problem might also be a bad AC programmer, (black box the 5 way connector attaches to), a bad controller (Buttons you push), or a bad vacuum actuator, or a stuck valve. I hope your problem is as simple as the previous post (mine has not been that simple). The service manual has quite a bit of info in 3 or 4 seperate sections that may help you. FrankLT4CE
Safety Car
Joined: Jul 1999
Posts: 3,946
Likes: 63
From: Marianna FL
Re: Upper vents don't work? (Midnight)
Before going to all the trouble above, look under the fuel rail cover on the passengers side. There's a check valve in the vacuum line right there that deteriorates really badly. Most people I've seen with the problem you described fixed it by replacing this plastic valve. :)
Pro
Joined: May 2000
Posts: 738
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From: Wichita Kansas
FedEx Bowl 4 St. Jude '09
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Re: Upper vents don't work? (Midnight)
My 94 was the same way when i bought it, I am assuming a 96 would be pretty close. There is a plastic vacum T fitting with a little ball in it. I'll call it a ball valve t fitting for lack of name. It lays at the rear of the manifold under the fuel rail covers on the passenger side. It is probably less than 5 dollars and a very easy fix. Mine was hard and cracked, hopefully this is what is wrong with yours.
