Summer Time..
Thread Starter
Racer
Joined: Nov 2006
Posts: 382
Likes: 2
Summer Time..
Ok, well its basically summer time here in Texas, and it is hot down here, and its not even June or July yet. And my AC has not been working right, and I NEED to fix it. My AC will get cold and I can control the levels but It only comes out the defroster and by the legs, it will not come out threw the main vents?? What could be the cause and what should I look for? thanks
Team Owner
Joined: Oct 2000
Posts: 96,443
Likes: 9
From: Fort Knox, KY
Cruise-In IV Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
Cruise-In VIII Veteran
Does your climate control panel look like this? If so, you have the Electronic Climate Control option.
Are you also noticing that there's no change in airflow when you select different vent settings, i.e. Dash vs. Floor vs. Windshield?
If the problem is affecting the airflow mode AND the recirc setting, then the issue is likely your vacuum line coming from the engine compartment into the dash that controls the vacuum actuators that move the doors for airflow/recirc.
The vacuum line passes through the firewall below the battery and it's not uncommon for the line to spring a leak resulting in no vacuum, hence no airflow changes.
If the problem is only the recirc setting, then that vacuum actuator may have gone bad and is no longer able to move the recirc door, or the door is stuck.
Hope this helps.
Last edited by onedef92; May 1, 2007 at 09:42 AM.
Pro
Joined: Mar 2005
Posts: 569
Likes: 0
From: College Station Texas
You might have the same problem I had.
Try this link.
http://forums.corvetteforum.com/show...on&forum_id=48
My buttons didn't work when I bought my car. I thought it was some big electrical problem and I needed to drop some cash to fix it. Turns out I just needed to follow Perfusion's directions and take it all apart and clean some contacts. Check it out. Dust gets in there and makes the button not work. Takes about an hour and will make you 10 times happier.
Try this link.
http://forums.corvetteforum.com/show...on&forum_id=48
My buttons didn't work when I bought my car. I thought it was some big electrical problem and I needed to drop some cash to fix it. Turns out I just needed to follow Perfusion's directions and take it all apart and clean some contacts. Check it out. Dust gets in there and makes the button not work. Takes about an hour and will make you 10 times happier.
Team Owner
Joined: Oct 2000
Posts: 96,443
Likes: 9
From: Fort Knox, KY
Cruise-In IV Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
Cruise-In VIII Veteran
From a previous post search, the Vent position is controlled by the Programmer which switches vacuum to any one of several solenoids that suck the HVAC doors open or closed.
If it loses the vacuum source, default is Defrost. It doesn't sound like that's happened with your Vette, although you can check it out by referring to the vacuum diagram in the engine compartment.
Trace the line to the check valve that's under the left fuel rail cover. Make sure that valve hasn't fallen apart. Otherwise the problem is with the Dash Controls or the Programmer.
The best way to diagnose it is with a bi-directional scanner using the CCM link up. That device will emulate the controls and if it works, you need a rebuilt control panel or you can try taking it apart and cleaning the contacts. If that's not it, it's the Programmer.
If it loses the vacuum source, default is Defrost. It doesn't sound like that's happened with your Vette, although you can check it out by referring to the vacuum diagram in the engine compartment.
Trace the line to the check valve that's under the left fuel rail cover. Make sure that valve hasn't fallen apart. Otherwise the problem is with the Dash Controls or the Programmer.
The best way to diagnose it is with a bi-directional scanner using the CCM link up. That device will emulate the controls and if it works, you need a rebuilt control panel or you can try taking it apart and cleaning the contacts. If that's not it, it's the Programmer.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every Model vs Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
Thread Starter
Racer
Joined: Nov 2006
Posts: 382
Likes: 2
mine does look like that pic above, and I can change my buttons like from defrost to main vents, so defrost turns off and switches to main, but nothing comes out, even the little green light above the button turns on, and I checked that piece by the left fuel rail and my piece looks new,maybe my buttons are not making contact?
Team Owner
Joined: Oct 2000
Posts: 96,443
Likes: 9
From: Fort Knox, KY
Cruise-In IV Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
Cruise-In VIII Veteran
mine does look like that pic above, and I can change my buttons like from defrost to main vents, so defrost turns off and switches to main, but nothing comes out, even the little green light above the button turns on, and I checked that piece by the left fuel rail and my piece looks new,maybe my buttons are not making contact?
The vacuum line runs from the engine compartment into the dash and controls the vacuum actuators that move the doors for airflow/recirc.
The line passes through the firewall below the battery and it's not uncommon for it to spring a leak resulting in no vacuum, hence no airflow changes.
Thread Starter
Racer
Joined: Nov 2006
Posts: 382
Likes: 2
idk if this helps But I found a wire that looked like it was cut off on the first pic, and second pic is a wire that was all taped up, both of these pics are around the AC area under the hood
Last edited by BlackVette00; May 2, 2007 at 10:55 PM.