HVAC Problem
Thread Starter
Instructor
Joined: Jul 2006
Posts: 101
Likes: 0
From: Mechanicsville Virginia
HVAC Problem
Hi,
I just brough home a new to me 2002 vert. On the way home last night, my HVAC did some strange things. 42 outside and set on 72-76 inside produced hot and cold air coming through dash vents, Or same with cold air coming out of defroster. If set to 80, then you would get some heat, Or set to 70 or less, with (windoes down) you get a/c. You could set the mode manually and get a fair amount of heating or cooling . All fan speeds produced less than forceful air flow.
I've read ALL the posts, and haven't quite come up with this combo.
HELP!
Thanks,
Silversides
I just brough home a new to me 2002 vert. On the way home last night, my HVAC did some strange things. 42 outside and set on 72-76 inside produced hot and cold air coming through dash vents, Or same with cold air coming out of defroster. If set to 80, then you would get some heat, Or set to 70 or less, with (windoes down) you get a/c. You could set the mode manually and get a fair amount of heating or cooling . All fan speeds produced less than forceful air flow.
I've read ALL the posts, and haven't quite come up with this combo.
HELP!
Thanks,
Silversides
Tech Contributor
Joined: Aug 1999
Posts: 16,376
Likes: 404
From: Should this thoughtful, valuable contribution meet with no acknowledgement or 'thanks' this post----
Sorry to hear about those problems. If you find you need to replace the HVAC dash controller unit I have one for sale that I used in my car for several months...works fine, everything lights up and functions...$100 shipped.
Jerry
Jerry
Burning Brakes
Joined: Aug 2004
Posts: 832
Likes: 30
From: Georgia
I have the same thing. I will set it to 76 and on the floor and ten minutes later it will be split between floor and defroster and the AC is on. I don't even try the Auto mode anymore because it keeps the AC on the whole time even with the temp set to 80.
Pro
Joined: Oct 2000
Posts: 545
Likes: 1
From: Charlotte NC
Hi,
I just brough home a new to me 2002 vert. On the way home last night, my HVAC did some strange things. 42 outside and set on 72-76 inside produced hot and cold air coming through dash vents, Or same with cold air coming out of defroster. If set to 80, then you would get some heat, Or set to 70 or less, with (windoes down) you get a/c. You could set the mode manually and get a fair amount of heating or cooling . All fan speeds produced less than forceful air flow.
I've read ALL the posts, and haven't quite come up with this combo.
HELP!
Thanks,
Silversides
I just brough home a new to me 2002 vert. On the way home last night, my HVAC did some strange things. 42 outside and set on 72-76 inside produced hot and cold air coming through dash vents, Or same with cold air coming out of defroster. If set to 80, then you would get some heat, Or set to 70 or less, with (windoes down) you get a/c. You could set the mode manually and get a fair amount of heating or cooling . All fan speeds produced less than forceful air flow.
I've read ALL the posts, and haven't quite come up with this combo.
HELP!
Thanks,
Silversides
Le Mans Master
Joined: May 2007
Posts: 5,383
Likes: 6
From: hagerstown md
St. Jude Donor '08-'09
First things first, pull up your codes and see what HVAC codes are there.
Hold the options button, press the fuel button 4 times, read the codes, then post them here. Need to see what codes you have before we can make a better diagnosis.
When mine was doing the same thing, it was the right side actuator that was the culprit. Don't remember the code it threw, but it was right there. Replaced the actuator, and all is well.
Here's a couple of links to the codes you might want to bookkmark:
http://www.gearchatter.com/index.php...95e5740a74d10d
http://www.corvettedoctor.com/2004_DTC_Codes.html
Pull the codes, and post them here, make sure you put an H or a C behind them so we know if they are current of not.
Hold the options button, press the fuel button 4 times, read the codes, then post them here. Need to see what codes you have before we can make a better diagnosis.
When mine was doing the same thing, it was the right side actuator that was the culprit. Don't remember the code it threw, but it was right there. Replaced the actuator, and all is well.
Here's a couple of links to the codes you might want to bookkmark:
http://www.gearchatter.com/index.php...95e5740a74d10d
http://www.corvettedoctor.com/2004_DTC_Codes.html
Pull the codes, and post them here, make sure you put an H or a C behind them so we know if they are current of not.
