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.
Have a 2004 Yukon Denali. Had the same experience as the 2005 Silverado crew cab one of the other responders. Two fuses–one as documented in the procedure and the other on the Dash end cap inside the drivers door labeled HVAC. Pulled both followed the steps and back in business. thanks
This worked perfectly for my 2000 Grand Am SE. I thought it might be the blend door actuator, but hadn’t found clear instructions on how to resolve the issue, and didn’t want to take it to the shop for what I hoped was a simple fix. I finally found this page, followed Sparky’s instructions (I disconnected the battery), and am now enjoying cold a/c.
Thank you so much!
Thanks it worked
Thank you Sparky, so far so good!
Glad it is working again. You should however prepare yourself for actuator replacement.