The topic of how to perform the actuator recalibration procedure on Chevrolet , GMC and Cadillac Trucks and SUVs has become an ever increasing topic of discussion.
For manual systems it does not matter where the a/c controls are set but if you feel the need to do something, turn the blower switch on (I prefer speed 3) and set the temperature sliders about .5″ to .75″ from full cold.
For auto systems, press the auto button, with the key on.
Turn the ignition off.
Remove the HVAC/ECAS , 10 amp fuse in the underhood fuse box* or disconnect the battery for one minute.
*Fuse locations can vary from year to year and between different models. Hopefully I will be able to build a list for this.
Install the HVAC fuse or reconnect the battery.
Start the engine. On systems with auto a/c controls the controls will default to 74 degrees F when the ignition is turned back on.
DO NOT TOUCH the a/c controls.
Let the engine run for 1-2 minutes.
Turn the ignition off for at least 10 seconds but no more than 30 seconds.
Restart the engine and then test the a/c controls.
Had same problem with 2004 Silverado 2500HD. Blowing hot on drivers side randomly. Did reset and has worked for over 2 weeks in the August South Carolina heat. Might buy me some time before replacing actuator. Did notice that 65 degrees doesn’t feel as cold as it did before. It’s better than hot air though. Thanks!
Chris
The most common problem would be the wrong replacement part number was installed. What was the brand of part and the part number? Did you change the upper or lower actuator on the passenger side of the truck?
I have a 2003 silverado 6.0 4×4 crewcab.
I removed the passenger side temp door actuator because it was making a clicking sound. Turns out it had a broken gear inside. I’ve installed the new actuator and at initial start up it operates but then stops on heat and doesnt respond to controls. Ive tried the calibration steps with no luck. Any ideas what I might be doing wrong?
Thank
The HVAC B fuse is the correct fuse to pull to start the recalibration. You must follow the steps correctly after removing and installing that fuse. If the vent control stopped working shortly after a battery replacement the mode actuator is faulty. If the mode actuator has already been replaced and the system will not calibrate properly there are several possibilities. The wrong part was used. The wrong actuator was changed. The actuator was not properly installed. The recalibration process was not done correctly. The recalibration was done correctly but there is another faulty actuator that is preventing the recalibration from completing. and Etc.
I have a 2005 GMC Envoy and I have a similar problem with the air only blowing threw the feet and defrost. I’ve tried recalibrating the hvac a few times and it doesn’t seem to work. However, I noticed today that if I pull the HVAC B fuse the air will blow out of the front vents. Does this mean that I am not doing something right in the calibration?