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.
Look at the rotation of the shaft on the lower (driver’s) temperature door actuator. If it rotates in a nominal 90 degree arc as the temperature is commanded from hot to cold, the actuator and controls are okay. Assuming that it does, you may have a refrigerant problem. Check the refrigerant lines at the firewall. Both should be cold and nearly the same temperature. A/C on and the engine running for several minutes to stabilize.
My 2005 Silverado w/auto dual controls only blows VERY hot air unless it is on 60 degrees then it is cool but not cold. Both sides are the same, replaced drivers side actuator that seemed to not work and pulled out mode actuator checked it and it seemed OK, still have all hot air. All functions work, just all hot and full fan like its not reaching its set temperature. Cannot find anybody that has this problem. Most are one side hot, one side cold. I’m puzzled and cant pinpoint my problem. Any suggestions? Thanks.
Yes, if it is not lined up, you will need to remove and re install the actuator.
Thanks, sounds like I might hav to remove the actuator and re-install correctly. Is that the next step if it’s not lined up?
On the white plastic gear/cog there is a scalloped area. Adjust the controls so that the actuator moves. Look to see if the black peg on the lever is ending up in that scalloped area of the gear. That is an alignment stop.