Climate Control Locks Up
Thread Starter
Cruising
Joined: Sep 2014
Posts: 10
Likes: 0
Climate Control Locks Up
I have a 1994 LT1 and the climate control locks up after about 15 seconds. Before it locks up the buttons work and I can hear what I believe is the changing of the vacuum from under the dash right above the throttle pedal. I then hear what sounds like a motor hum and that's when it locks up. It will only blow air out of the floor vents regards of what LED is lit on the control panel. Anyone have or know of this problem?
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Can you see the diagnostic codes from the system?
How to get the codes and what they mean:
http://forums.corvetteforum.com/1585305121-post2.html
How to get the codes and what they mean:
http://forums.corvetteforum.com/1585305121-post2.html
Thread Starter
Cruising
Joined: Sep 2014
Posts: 10
Likes: 0
Can you see the diagnostic codes from the system?
How to get the codes and what they mean:
http://forums.corvetteforum.com/1585305121-post2.html
How to get the codes and what they mean:
http://forums.corvetteforum.com/1585305121-post2.html
Last edited by Corso; Sep 16, 2014 at 08:32 AM.
Thread Starter
Cruising
Joined: Sep 2014
Posts: 10
Likes: 0
Yes, I've seen the video and it passes with a -00. I took out the head unit and cleaned the all contacts looked for cold solder breaks and even put the diodes, transistors and caps on a Huntron. All test good. I'm trying to take out the C68 Programmer but have no clue to how get the push nut off the housing for the vacuum tubes. There's not a lot of room under there. A friend of mine says it sounds like a vacuum leak. But the timing of it locking up seems like it's electronic. I've also read your thread about the 140 ohm resistors but this Programmer is different from the pictures you posted.
Advanced
Joined: Feb 2014
Posts: 74
Likes: 0
no start
sounds like the vat security system.
its in the area your working on theres a wire that goes from vat system to the key it has to read the write resistance for the security system to allow the starter to turn over.
there a lot of good reads the vat security system do a search
good luck steve
its in the area your working on theres a wire that goes from vat system to the key it has to read the write resistance for the security system to allow the starter to turn over.
there a lot of good reads the vat security system do a search
good luck steve
Thread Starter
Cruising
Joined: Sep 2014
Posts: 10
Likes: 0
sounds like the vat security system.
its in the area your working on theres a wire that goes from vat system to the key it has to read the write resistance for the security system to allow the starter to turn over.
there a lot of good reads the vat security system do a search
good luck steve
its in the area your working on theres a wire that goes from vat system to the key it has to read the write resistance for the security system to allow the starter to turn over.
there a lot of good reads the vat security system do a search
good luck steve
The security light is on when turned to the run position. I'm replaying what I did and I think I might have f'ed up. I used the blank key that was in the console when starting it after I had put it back together. I read in the owner's manual that if the PASS key is not used it will time out for 3 minutes. Is it possible to confuse the VAT if the blank is used several times? Because everything else looks good as far as wiring goes.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
I have a 1994 LT1 and the climate control locks up after about 15 seconds. Before it locks up the buttons work and I can hear what I believe is the changing of the vacuum from under the dash right above the throttle pedal. I then hear what sounds like a motor hum and that's when it locks up. It will only blow air out of the floor vents regards of what LED is lit on the control panel. Anyone have or know of this problem?
https://www.corvetteforum.com/forums...-repaired.html
Just to tell you up front here, the lock nut and vacuum hoses do not have to be removed.
Thread Starter
Cruising
Joined: Sep 2014
Posts: 10
Likes: 0
On -01 when I hit the fan button it gives a code of 75. Okay, I think I know how to read the codes. 75 is the temp setting. The ones that I've gone trough seem okay. The problem is it locks up before I can get to all of them.
Last edited by Corso; Sep 17, 2014 at 10:22 AM.
Thread Starter
Cruising
Joined: Sep 2014
Posts: 10
Likes: 0
Cliff I should have been more specific, I 'tried' to start it with the blank key. It never would start using it. But after it sitting overnight it starts every time with the PASS key.
Last edited by Corso; Sep 17, 2014 at 01:58 PM.
Thread Starter
Cruising
Joined: Sep 2014
Posts: 10
Likes: 0
Read this link I wrote as it pertains to the 94. See if the symptoms I described pertain to you. If they do, there is a lot of information on how to repair it.
https://www.corvetteforum.com/forums...-repaired.html
Just to tell you up front here, the lock nut and vacuum hoses do not have to be removed.
https://www.corvetteforum.com/forums...-repaired.html
Just to tell you up front here, the lock nut and vacuum hoses do not have to be removed.
Last edited by Corso; Sep 17, 2014 at 11:08 AM.
Thread Starter
Cruising
Joined: Sep 2014
Posts: 10
Likes: 0
My 94 is back up and running with cold air. Thanks Cliff, pcolt94 and rochound for you help and replies. It was the 33 mic cap that cause the lock up. PITA but saved me $ and that is always a good thing.