A/C cold air work around fix
Thread Starter
Melting Slicks
Joined: Nov 2014
Posts: 3,399
Likes: 1,339
From: Havre de Grace Maryland
A/C cold air work around fix
Here is some info I would like to pass on just in case it may help others. My 04 vert HVAC was showing codes BO361H(Left Actuator short to ground) and BO441H Left actuator out of Range). Cleared them and ran the car again w/o AC for 10 miles and no C codes showing. Then I turned on my AC and got no cold air from driver’s side and barely cool air on the passenger side. I have dual control and driver’s was set at 65 and Passenger was set in the middle range. So I returned home, and did the re-calibration (driver set at 60 degrees, passenger set at mid point) of the actuators by disconnecting the negative post, pulling fuse #27 in PC, waited 5 minutes, connected the negative post then inserted #27. Started the car, left the drivers temp at 60 degrees and slowly turned the passengers temp to the lowest point then turned on the AC. Walla, ice cold air from both sides. Now you can hang meat in the Vette. Nothing has changed in the past week. And I am not touching the temp controls for the rest of the summer heat season. Not a permanent fix (still getting the same H codes) but one to use for now.
Advanced
Joined: Apr 2013
Posts: 85
Likes: 3
From: Mcalester Oklahoma
Did this on my car and it came back after a few days. Good luck on yours though. The actuators can be had on amazon for ~$40, I bought a dorman 604-106 (iirc) for mine. Will be installing mine tonight.
Instructor
Joined: Aug 2015
Posts: 156
Likes: 8
So how exactly did this fix the problem? The drivers side blows cold on my 2000 but the passenger is HOT. I reset codes with the ac on once and you could tell the doors moved but the passenger ended up moving through the cold air and back to blowing hot.
Le Mans Master
Joined: Feb 2012
Posts: 6,644
Likes: 481
From: OK
C5 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).
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.
Instructor
Joined: Aug 2015
Posts: 156
Likes: 8
Resetting the codes will not fix anything... the re-calibration will sometimes, at least temporarily fix the problem...
C5 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).
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.
C5 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).
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.
I have never pulled that fuse but I did do something that made the actuators go from hot to cold while the car was running. I guess that is what happened when I cleared the code. Will be trying this in the morning.
