Newbie with A/C Question
Thread Starter
Advanced
Joined: Aug 2011
Posts: 50
Likes: 0
From: S. Daytona Florida
Newbie with A/C Question
I just bought my first Corvette. It is a 1991, convertible, with automatic temp control. The a/c works, and blows cold but not out of the dash vents. Is this a common problem? Vacuum issue? Any Ideas? I have not picked the car up yet, I went and test drove it a few days ago. So if you need more info, I will have it home tomorrow. Thanks in advance, Kim
Instructor
Joined: Aug 2009
Posts: 242
Likes: 0
From: La Verne California
I just bought my first Corvette. It is a 1991, convertible, with automatic temp control. The a/c works, and blows cold but not out of the dash vents. Is this a common problem? Vacuum issue? Any Ideas? I have not picked the car up yet, I went and test drove it a few days ago. So if you need more info, I will have it home tomorrow. Thanks in advance, Kim
Very well could be the control module contacts need cleaning. Not a hard fix. There is a fairly new thread about this on the Forum. Just did mine and everything works great. Cost = $0
Burning Brakes
Joined: Nov 2009
Posts: 828
Likes: 103
From: Olney MD
AC issues
Welcome to the Forum, Kim!
The other replies have you on the right track. My issue with my 18 month old '93 is that the blend door seems stuck. So my vents work great as long as you want hot air!!
Best of luck getting your vent issue resolved. Don't forget to post some pictures!!
The other replies have you on the right track. My issue with my 18 month old '93 is that the blend door seems stuck. So my vents work great as long as you want hot air!!
Best of luck getting your vent issue resolved. Don't forget to post some pictures!!
Thread Starter
Advanced
Joined: Aug 2011
Posts: 50
Likes: 0
From: S. Daytona Florida
Hello All,
I picked her up yesterday and brought her home, about 70 miles. Runs and drives great. I played with the A/C on the drive. Air blows cold, but no matter what position the programmer is in the air mostly come out the defrost with a little out the floor (bi-level perhaps). Cruise Control works perfect. Not looking foward to going under dash LOL. I will clean her up today and take some pictures to post. I have a brake issue to post later also. Thanks all and I am excited!! Kim
I picked her up yesterday and brought her home, about 70 miles. Runs and drives great. I played with the A/C on the drive. Air blows cold, but no matter what position the programmer is in the air mostly come out the defrost with a little out the floor (bi-level perhaps). Cruise Control works perfect. Not looking foward to going under dash LOL. I will clean her up today and take some pictures to post. I have a brake issue to post later also. Thanks all and I am excited!! Kim
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Thread Starter
Advanced
Joined: Aug 2011
Posts: 50
Likes: 0
From: S. Daytona Florida
Thanks,
Camelotian posted to clean the contacts in the control module. I want to try this first after visually looking under the dash, LOL. Question is where is this module? Thanks, Kim
Camelotian posted to clean the contacts in the control module. I want to try this first after visually looking under the dash, LOL. Question is where is this module? Thanks, Kim
Thread Starter
Advanced
Joined: Aug 2011
Posts: 50
Likes: 0
From: S. Daytona Florida
OK, I think or at least hope I found my problem. I found a vacuum line, (hard plastic) interwined with wiring coming out of the firewall on the passenger side. Looks like it goes up to the programmer. I assume it comes from the plenum or a tee or check valve. With the engine running, there is no vacuum on it. My question is where exactly does this line connect to on the engine side. I can not see it entering the interior. Tomorrow I will connect it to a hand vacuum pump and then see if my vents work right. I am hoping they will. Thanks again, Kim
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The vacuum check valve is next to the distributor on the driver's side. It goes inside the car to control the blend doors and to the cruise control. That's why the question was asked about the cruise control working.
Burning Brakes
Joined: Oct 2001
Posts: 911
Likes: 5
From: TN
96 LT4 air conditioner
My 96 started this summer not blowing air conditioning through the vents on initial use. About 10 minutes of driving, this changes and the air conidtioning is coming out of the vents. I have not tried to trouble shoot the problem since it will still blow air out the vents and the air conditioner works.
Thread Starter
Advanced
Joined: Aug 2011
Posts: 50
Likes: 0
From: S. Daytona Florida
Thanks to everyone!! I have found the problem. It appears at one time the vacuum check valve broke, and the PO removed it and the tee and bypassed the hose to the a/c. I installed a tee, re-connected the hose, and it all works as it should. I will need to find a check valve and install it, but for now it is much better. Thanks again for all your help. Kim
