Climate control issues!!
Thread Starter
Drifting
Joined: Feb 2013
Posts: 1,465
Likes: 12
Climate control issues!!
Today I was driving my 92 over to put it on the dyno and all the way there the climate control was intermittently turning itself on. I would shut the thing off and 5 minutes later it would turn back on. On the way home it did the same thing. After I got home I let the car sit for about 1/2 hour then decided to take it to the store. When I started the car baack up the screen for the temp display was nothing but dash lines acrossed it.
After I got about 2 blocks from home the heater fan kicked on full blast, the screen lite up and said outside temp 166*. I wasnt able to turn the fan off or anything.
When I got back out the store, the dash lines where across the screen again and the heater fan was on high. No buttons would control anything.
After I got home I disconnected the battery in hopes that it would somehow fix it. Didnt work lol. So I pulled the A/C fuse..
Im guessing I either had a ground bad or a bad relay or the climate control box itself is shot.
Any body have any idea how to confirm any of this?
After I got about 2 blocks from home the heater fan kicked on full blast, the screen lite up and said outside temp 166*. I wasnt able to turn the fan off or anything.
When I got back out the store, the dash lines where across the screen again and the heater fan was on high. No buttons would control anything.
After I got home I disconnected the battery in hopes that it would somehow fix it. Didnt work lol. So I pulled the A/C fuse..
Im guessing I either had a ground bad or a bad relay or the climate control box itself is shot.
Any body have any idea how to confirm any of this?
Race Director
Joined: Oct 2005
Posts: 11,769
Likes: 175
From: Rolla Missouri
2021 C4 of the Year - Unmodified Finalist
St. Jude Donor '10 thru '25
Have you taken controller unit out and tried cleaning the buttons?
If not, take a look at this thread with video.
Quite a few of these it seems where the buttons eventually don't do anything when pushed.
I cleaned mine a couple of years ago, and it has worked great ever since.
https://www.corvetteforum.com/forums...ol-repair.html
If not, take a look at this thread with video.
Quite a few of these it seems where the buttons eventually don't do anything when pushed.
I cleaned mine a couple of years ago, and it has worked great ever since.
https://www.corvetteforum.com/forums...ol-repair.html
Pro
Joined: Mar 2009
Posts: 702
Likes: 259
From: Middletown Delaware
Today I was driving my 92 over to put it on the dyno and all the way there the climate control was intermittently turning itself on. I would shut the thing off and 5 minutes later it would turn back on. On the way home it did the same thing. After I got home I let the car sit for about 1/2 hour then decided to take it to the store. When I started the car baack up the screen for the temp display was nothing but dash lines acrossed it.
Any body have any idea how to confirm any of this?
Any body have any idea how to confirm any of this?
https://www.corvetteforum.com/forums...-repaired.html
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Check out this post on how to go into diagnostic mode on the HVAC controller:
http://forums.corvetteforum.com/1585305121-post2.html
http://forums.corvetteforum.com/1585305121-post2.html
Thread Starter
Drifting
Joined: Feb 2013
Posts: 1,465
Likes: 12
I made the video of the climate control head repair. It would be nice if it could become a sticky so people could more easily find the info to this common problem with the C4's. Unfortunately smooth1990 from the symptoms that you are describing it appears that the climate control PROGRAMMER is in need of repair. It is located above the accelerator pedal, up behind the dash knee panel. A real pain to get to. You can try cleaning the control head first like I show in my video but most likely will need to repair the cc programmer. I don't have a video on this repair yet but you can check out the link below to get a better direction. Good luck -Ozz
https://www.corvetteforum.com/forums...-repaired.html
https://www.corvetteforum.com/forums...-repaired.html
Great write up! It seems the controller will be the route of all evil in this one and I am not looking forward to digging into it! Im not very good at soldering or circuit boards either but Im going to give it a try! Thanks Guys. Ill post back with my experiences with this one lol.
1st Gear
Joined: Sep 2014
Posts: 1
Likes: 0
From: norwood pa
I made the video of the climate control head repair. It would be nice if it could become a sticky so people could more easily find the info to this common problem with the C4's. Unfortunately smooth1990 from the symptoms that you are describing it appears that the climate control PROGRAMMER is in need of repair. It is located above the accelerator pedal, up behind the dash knee panel. A real pain to get to. You can try cleaning the control head first like I show in my video but most likely will need to repair the cc programmer. I don't have a video on this repair yet but you can check out the link below to get a better direction. Good luck -Ozz
https://www.corvetteforum.com/forums...-repaired.html
https://www.corvetteforum.com/forums...-repaired.html
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
This is a really nice and well done video. I did a write up on the control head years ago but the video is truly a good step by step instruction for anyone and more informative that a simple write up.
Sorry I did not make a video for the programmer repair but I think the video fits the control head repair better.
Sorry I did not make a video for the programmer repair but I think the video fits the control head repair better.
Pro
Joined: Mar 2009
Posts: 702
Likes: 259
From: Middletown Delaware
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Pro
Joined: Mar 2009
Posts: 702
Likes: 259
From: Middletown Delaware
This is a really nice and well done video. I did a write up on the control head years ago but the video is truly a good step by step instruction for anyone and more informative that a simple write up.
Climate Control Repair- C4 Corvette - YouTube
Sorry I did not make a video for the programmer repair but I think the video fits the control head repair better.
Climate Control Repair- C4 Corvette - YouTube
Sorry I did not make a video for the programmer repair but I think the video fits the control head repair better.
Navigator
Joined: Oct 2015
Posts: 9
Likes: 0
Hi Guys, I have a '96 LT4 Convertible, 82k on it, bought it last fall. My first Corvette. This spring I began noticing intermittent issues with my Climate Control, at times, the buttons are unresponsive. I'm ashamed to say this, but the "Flintstone Fix" (a solid whack to the side of the console) will coerce them into working again. Note that the buttons I use the most are "OFF", "AUTO" and the temperature buttons, all of which will exhibit this symptom, and the others will too. It's not just one or two of the buttons.
In all of your experience, what am I dealing with here? Buttons that need cleaning? A loose connection? A unit that needs rebuilding? Thanks in advance!
In all of your experience, what am I dealing with here? Buttons that need cleaning? A loose connection? A unit that needs rebuilding? Thanks in advance!
Race Director
Joined: Oct 2005
Posts: 11,769
Likes: 175
From: Rolla Missouri
2021 C4 of the Year - Unmodified Finalist
St. Jude Donor '10 thru '25
Hi Guys, I have a '96 LT4 Convertible, 82k on it, bought it last fall. My first Corvette. This spring I began noticing intermittent issues with my Climate Control, at times, the buttons are unresponsive. I'm ashamed to say this, but the "Flintstone Fix" (a solid whack to the side of the console) will coerce them into working again. Note that the buttons I use the most are "OFF", "AUTO" and the temperature buttons, all of which will exhibit this symptom, and the others will too. It's not just one or two of the buttons.
In all of your experience, what am I dealing with here? Buttons that need cleaning? A loose connection? A unit that needs rebuilding? Thanks in advance!
In all of your experience, what am I dealing with here? Buttons that need cleaning? A loose connection? A unit that needs rebuilding? Thanks in advance!
Your symptoms are what most experience, and following the cleaning instructions have fixed 99% of them.
My '96 was doing the same thing, and cleaning the buttons fixed it.
Pro
Joined: Mar 2009
Posts: 702
Likes: 259
From: Middletown Delaware
Hi Guys, I have a '96 LT4 Convertible, 82k on it, bought it last fall. My first Corvette. This spring I began noticing intermittent issues with my Climate Control, at times, the buttons are unresponsive. I'm ashamed to say this, but the "Flintstone Fix" (a solid whack to the side of the console) will coerce them into working again. Note that the buttons I use the most are "OFF", "AUTO" and the temperature buttons, all of which will exhibit this symptom, and the others will too. It's not just one or two of the buttons.
In all of your experience, what am I dealing with here? Buttons that need cleaning? A loose connection? A unit that needs rebuilding? Thanks in advance!
In all of your experience, what am I dealing with here? Buttons that need cleaning? A loose connection? A unit that needs rebuilding? Thanks in advance!