HVAC controls not telling blower to turn on, intermittent

hillstrubl said:

Wife texted me saying the 2011 Tahoe we bought recently isn't enabling the front blower fans, but rear controls worked fine.
I got in today and everything is fine. Should I pull the dash apart and make sure there isn't anything obvious or is an easier check to pull the HVAC fuse and wait a bit?

Click to expand...

02Lightning said:

I just replaced my blower motor, and it didn't help.

Click to expand...

hillstrubl said:

I don't think its the motor for mine anyway, its like its not being "told" to engage. I might try to source a used control panel first.

Click to expand...

Doubeleive said:

if any of you have a tech2 you could try commanding the fan on when this happens if it does not respond or does respond but the controller won't change it alone. then I would certainly suspect the controller.
also check for any hvac system codes. blend door feedback codes are very common but most likely not the issue in this case.
you could also maybe check and see what the comanded state of the fan is versus actual. (if there is such a option in the tech2)
mine is in the shop for a couple more days so I can't offer much more help at the moment.

***also I assume all of you have the digital control? or is this happening with the manual controls also?

Click to expand...