90 vent problems
Thread Starter
Navigator
Joined: Jun 2009
Posts: 9
Likes: 0
From: Duluth Georgia
90 vent problems
everytime i turn on the heat or ac, it will only come out at defrost and floor. i read the other posts and it seems like i have a thousand wires down by my accelerator pedal. i was hoping someone might have a picture of what i need to find exactly. thanks guys
Team Owner
Joined: Feb 2003
Posts: 54,156
Likes: 9,464
From: Sitting in his Nowhere land Hanover Pa
2024 C2 of the Year Finalist - Unmodified
2015 C2 of Year Finalist
on my dads old 91 vert. he had the same problem. and all it was some of the vacuum lines around the top of the engine were melted shut. and not allowing enough vacuum to operate the HAVC
Team Owner
Joined: Feb 2003
Posts: 54,156
Likes: 9,464
From: Sitting in his Nowhere land Hanover Pa
2024 C2 of the Year Finalist - Unmodified
2015 C2 of Year Finalist
Team Owner
Joined: Feb 2003
Posts: 54,156
Likes: 9,464
From: Sitting in his Nowhere land Hanover Pa
2024 C2 of the Year Finalist - Unmodified
2015 C2 of Year Finalist
Safety Car
Joined: Jan 2008
Posts: 3,939
Likes: 1
From: Vero Beach Florida
The AC picks up its vacuum from the rear left side fitting on the plenum it runs into a T check valve, the AC connection is the bottom fitting the center one hooks into the cruise control. The check valve is located back by the distributor the AC line is a small hard plastic line that runs in the main loom along fire wall.
Drifting
Joined: Dec 2007
Posts: 1,443
Likes: 3
From: Independence Kentucky
Try this link here, it has pics too. I had the same problem with my 96 and this fixed it.
http://forums.corvetteforum.com/c4-t...l-problem.html
http://forums.corvetteforum.com/c4-t...l-problem.html
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
Thread Starter
Navigator
Joined: Jun 2009
Posts: 9
Likes: 0
From: Duluth Georgia
F*ck my life haha there are so many wires down by the pedal that idk what im looking at. i did see a tiny hose out by the firewall but i cant see where it goes or where it came from. i need to find a diagram of every vacuum hose there is in my car
Thread Starter
Navigator
Joined: Jun 2009
Posts: 9
Likes: 0
From: Duluth Georgia
"TO HVAC" could be the problem. i had a prom made and i dont need my egr anymore and a mechanice took all the vacuum lines off of that and plugged a spot where a hose hooked up. im wondering if thats the HVAC hook up. a hose goes from the HVAC hookup on the intake in through the firewall and down by my pedal correct?
