Air Conditioning not blowing through upper vents
Thread Starter
Instructor
Joined: Feb 2000
Posts: 195
Likes: 0
From: Woodbridge VA
Air Conditioning not blowing through upper vents
Hi all, searched the archives but I didn't see my specific problem. Air is not blowing through my upper vents. The air conditioning comes from the heater vents at the bottom and the defrost vents up top. Point me in the right direction.
ZZZASY
'96 LT4
ZZZASY
'96 LT4
Drifting
Joined: Nov 2001
Posts: 1,783
Likes: 2
From: Latham NY
Re: Air Conditioning not blowing through upper vents (ZZZASY)
My 85 has a vacuum check valve that connects to the plenum and hvac vents and cruise control. Without the check valve functioning, vacuum is not held to keep the vents open. Don't know if you have this in the 96. It's a $5 part.
Drifting
Joined: Jun 2002
Posts: 1,305
Likes: 11
From: Savannah Ga.
Re: Air Conditioning not blowing through upper vents (Bluevette85)
QUOTE---------------------------------------------------------
. It's a $5 part.
----------------------------------------------------------------- :iagree: LOOK UNDER PASSENGER FUEL RAIL COVER..SMALL BLACK VACCUM VALVE
Pro
Joined: May 2000
Posts: 741
Likes: 0
From: Etowah, Tennessee
Re: Air Conditioning not blowing through upper vents (redcorvettedave)
Also, if by chance the underdash cover has been removed (on the passenger side of the car), there are many vacuum lines in that area. I went through the same scenario you are going through for 3 years...I accidentally saw a vacuum line pinched under the dash, from where I had a CD changer installed earlier. They had pinched the line reattaching the under dash panel. I straightened it out, and the vent work perfect now. I hope this helps...
Safety Car
Joined: May 2002
Posts: 4,010
Likes: 26
From: Somewhere nowhere
Re: Air Conditioning not blowing through upper vents
on the 96, it is NOT the check valve under the valve cover cover. it is under the dashboard at the controller.
do a search at the corvetteactioncenter.
my 96 has that problem, I have been to lazy to crawl under the dash.
do a search at the corvetteactioncenter.
my 96 has that problem, I have been to lazy to crawl under the dash.
Pro
Joined: Jan 2004
Posts: 626
Likes: 2
From: Nashville
Re: Air Conditioning not blowing through upper vents (larryfs)
My 96 does this when on AUTO. If you turn it to manual it will work like it is supposed to. I don't know why but this works for mine. Maybe the electronic unit....... Also the compressor works better on manual.
Instructor
Joined: Aug 2003
Posts: 148
Likes: 0
From: DFW Tx
St. Jude Donor '08
Re: Air Conditioning not blowing through upper vents (96BLKTN)
This forum is great. I have a 94 and under the passenger side cover was my broken part. Changed it out, and now have nice cool air flowing through the dash again. You definitely need it here in Texas! Thanks to all who help answer these questions! :cheers: :seeya
