HVAC controls not telling blower to turn on, intermittent

[hillstrubl]

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?

 

[My73tahiti]

Following this. Same issue, replaced the resistor. It’s getting 14v. How do I test the blower motor?

 

[TJFHUNTER243]

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?

FOLLOWING FOR SAME ISSUE WITH MY 07

 

[02Lightning]

I replaced the front blower resistor in mine, and the bower will stop for no reason, then start back up. None of the wires to the resistor looks like they have been hot or anything. So, looks like I'm in the same boat.

 

[hillstrubl]

Currently doing it again. The rear controls seem to work fine. I can get a small amount of air to come out if I have the rear on and recirculating disabled. It's like the blower isn't getting the message to spin up. Any ideas? Should I just take the dash apart?

 

[02Lightning]

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

 

[hillstrubl]

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

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.

 

[Doubeleive]

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?

 

[02Lightning]

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.

A digital control pannel will need programed to work.

 

[02Lightning]

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?

I do have access to a tech2, but mine only happen randomly for a few a seconds.