2005 Tahoe rear air only blowing at 2nd speed

[setconstr]

So I did a lot of research first thing I found was replace the actuator, did it ,nothing. Next was the resistor and I did that still no change. All the fuses are good so I'm stumped . Those parts were cheap so no biggy,,,,,,I have the overhead controls in the front and a controller in the back of the center consul. I'm sure this has been discussed here before ........

 

[wjburken]

So I did a lot of research first thing I found was replace the actuator, did it ,nothing. Next was the resistor and I did that still no change. All the fuses are good so I'm stumped . Those parts were cheap so no biggy,,,,,,I have the overhead controls in the front and a controller in the back of the center consul. I'm sure this has been discussed here before ........

So when you turn the fan speed knob, the fan only runs when it is on “2”, or no matter what the knob is turned to, the fan only runs at the speed that is equivalent to “2”?

 

[setconstr]

yes only runs at the 2nd speed

 

[OR VietVet]

https://www.rockauto.com/en/moreinfo.php?pk=506698&cc=1431156&jsn=1048&jsn=1048 at RA for $140.79 plus shiping

https://www.amazon.com/s?k=15-72988&ref=nb_sb_noss at Amazon Prime for $134.29 with free shipping

 

[setconstr]

I now have replaced the resistor and the actuators and the overhead rear air controls and it still only runs on the second speed of the overhead controls . I can hear the rear actuator working and air con and heat switch work but any other speed I get nothing , any ideas ? Thanks

 

[Doubeleive]

I now have replaced the resistor and the actuators and the overhead rear air controls and it still only runs on the second speed of the overhead controls . I can hear the rear actuator working and air con and heat switch work but any other speed I get nothing , any ideas ? Thanks

Ya, there is a rear hvac control module, if the resistor did not correct the problem then it would be the next suspect, your a/c controller and blend door were probably just fine

gm part number 15832319, I only see dorman replacements available out there though dorman p/n 601-036

 

[setconstr]

well I ordered that part today will see what happens......fingers crossed

 

[Doubeleive]

well I ordered that part today will see what happens......fingers crossed

kindly report back and let us know, that should resolve the problem.

 

[setconstr]

So There is no HVAC control module on my 05 rear blower motor just a blue connection right where the HVAC module would be on most rear unit's I have seen. No plugs that would connect to it so does that tell anybody what is different about mine I

 

[Fless]

Got pics of the rear HVAC with the trim piece off? I'm kinda curious about this.