A/C Blend Doors
Thread Starter
2nd Gear
Joined: Sep 2019
Posts: 2
Likes: 1
A/C Blend Doors
Battery went dead and I installed a new bat. A/C was cooling perfectly before the bat went dead, now after the new bat was installed, the AC isn't cooling nearly as good. I've read that the blend doors may need to be indexed, so my question is how do you "index" the AC blend doors on a C5, 2002?
Melting Slicks
Joined: Nov 2014
Posts: 3,399
Likes: 1,339
From: Havre de Grace Maryland
Battery went dead and I installed a new bat. A/C was cooling perfectly before the bat went dead, now after the new bat was installed, the AC isn't cooling nearly as good. I've read that the blend doors may need to be indexed, so my question is how do you "index" the AC blend doors on a C5, 2002?
Re-Calibrating Actuators
Use the following steps to perform the calibration update:
1. Turn OFF the ignition.
2. Remove the battery positive voltage circuit fuse of the HVAC Control Module (fuse #27 in the passenger fuse box).
Important
The module memory will not clear if the battery positive voltage circuit fuse is installed in less than 60 seconds.
3. Wait 60 seconds.
4. Install the fuse.
After reinserting the fuse, start the car. It will take about a minute or so for the system to re-calibrate.
DO NOT CHANGE ANY SETTINGS WHILE IT'S CALIBRATING!
Check that no codes have been set.
Hope this helps.
1st Gear
Joined: Apr 2023
Posts: 1
Likes: 0
Just wanted to confirm this process worked for me. Replaced the A/C compressor on my 2000. The driver side was blowing cold air, but the passenger side was stuck blowing max hot air. I attempted to adjust the passenger controls but they did not seem to have any effect. In order to get the reset to work I had to follow this process:
Remove fuse #27.
Disconnect the Positive side of the battery.
wait a few minutes.
Replace the #27 fuse.
Reconnect the battery.
Turn key to Acc position and wait. IT took a few seconds and the HVAC system activated and turned on the fan. At this point the passenger side adjust from max hot to the same temp as the driver side.
Turn key off and remove.
Insert the key and start the car.
Thanks for the post, really save me time trying to trouble shoot.
bk
Remove fuse #27.
Disconnect the Positive side of the battery.
wait a few minutes.
Replace the #27 fuse.
Reconnect the battery.
Turn key to Acc position and wait. IT took a few seconds and the HVAC system activated and turned on the fan. At this point the passenger side adjust from max hot to the same temp as the driver side.
Turn key off and remove.
Insert the key and start the car.
Thanks for the post, really save me time trying to trouble shoot.
bk
Race Director
Joined: Oct 2004
Posts: 12,861
Likes: 4,662
Just wanted to confirm this process worked for me. Replaced the A/C compressor on my 2000. The driver side was blowing cold air, but the passenger side was stuck blowing max hot air. I attempted to adjust the passenger controls but they did not seem to have any effect. In order to get the reset to work I had to follow this process:
Remove fuse #27.
Disconnect the Positive side of the battery.
wait a few minutes.
Replace the #27 fuse.
Reconnect the battery.
Turn key to Acc position and wait. IT took a few seconds and the HVAC system activated and turned on the fan. At this point the passenger side adjust from max hot to the same temp as the driver side.
Turn key off and remove.
Insert the key and start the car.
Thanks for the post, really save me time trying to trouble shoot.
bk
Remove fuse #27.
Disconnect the Positive side of the battery.
wait a few minutes.
Replace the #27 fuse.
Reconnect the battery.
Turn key to Acc position and wait. IT took a few seconds and the HVAC system activated and turned on the fan. At this point the passenger side adjust from max hot to the same temp as the driver side.
Turn key off and remove.
Insert the key and start the car.
Thanks for the post, really save me time trying to trouble shoot.
bk
Heel & Toe
Joined: Sep 2021
Posts: 23
Likes: 0
From: Granbury Texas
I have had AC problems on my 2002 Corvette for over 2 years. The drivers side continually blows hot air and the passenger side cold air. Had it to two AC shops, one told me it was the climate control module. Bought a used one, still a problem. The next shop told me it was the actuators. I explained I had replaced both. He said it had to be bad actuators. Two weeks later he called and said he could not fix it. New actuators did not fix the problem. He said refrigerant was good and no vaccum leaks. So, I have removed my dash to see if I can find the problem. I need an article or discussion about how the vents work and an article about indexing the actuators. Any help would be appreciated. I have tried resetting it more times than I can count...no luck.
Pro
Joined: Feb 2009
Posts: 651
Likes: 33
From: North Port Florida
Aaaa
I have had AC problems on my 2002 Corvette for over 2 years. The drivers side continually blows hot air and the passenger side cold air. Had it to two AC shops, one told me it was the climate control module. Bought a used one, still a problem. The next shop told me it was the actuators. I explained I had replaced both. He said it had to be bad actuators. Two weeks later he called and said he could not fix it. New actuators did not fix the problem. He said refrigerant was good and no vaccum leaks. So, I have removed my dash to see if I can find the problem. I need an article or discussion about how the vents work and an article about indexing the actuators. Any help would be appreciated. I have tried resetting it more times than I can count...no luck.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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