Originally Posted By: jsh1904
The battery can impact it but as others said, the issue is with the blend door/motor. Had the same intermittent issue with an 05 sierra. Replacing it is an option but you can also reset it to correct the issue. There is a sequence you need to go through to reset it, I will see if I can find it.


http://sparkys-answers.com/2011/08/hvac-actuator-recalibration-procedure.html


Isaiah 5:20 Woe to those who call evil good and good evil, who put darkness for light and light for darkness, who put bitter for sweet and sweet for bitter.