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.

 

[Doubeleive]

as far as I know they all have one, let's see some photo's and how long has the problem existed? has it been like that since you owned it?

 

[setconstr]

Its all back together now but here is a schematic of the way mine is. I believe that it's my blower motor so I can replace that or take to the dealership and let them figure it out .....I tried

 

[setconstr]

So I replaced the actuator, the resistor, the blower motor, the overhead control, all the fuses are good but it only runs on number 2 . I have the HVAC control module but mine is a bit different then most I see it's not mounted on the outside of the blower unit, mine looks exactly like the schematic I show in my last post.........Guess it's going to the chevy dealership . I'm sure it will be something simple throwing parts at something is not the way I usually roll but got a little sucked into this one ...

 

[setconstr]

So I think I found the problem there is an aftermarket DVD player in place of the original overhead unit whoever did it was complete hack ! I pulled it down and there is a wiring mess with a manual HVAC switch all taped up and I have no idea what to do with it I don't think there was an oem overhead control for HVAC there was probably an original DVD player up there because the controls are in the rear of the center consul . I really don't know what to do with it ai just want to get rid of all the crap and have a running rear heater and air con I think this mess could cost $ to clean up I don't know how to deal with it really

 

[wjburken]

So I think I found the problem there is an aftermarket DVD player in place of the original overhead unit whoever did it was complete hack ! I pulled it down and there is a wiring mess with a manual HVAC switch all taped up and I have no idea what to do with it I don't think there was an oem overhead control for HVAC there was probably an original DVD player up there because the controls are in the rear of the center consul . I really don't know what to do with it ai just want to get rid of all the crap and have a running rear heater and air con I think this mess could cost $ to clean up I don't know how to deal with it really

If you have a junk yard nearby, might take a trip and see if you can find a vehicle like yours and see how the stuff is supposed to be wired up.

 

[setconstr]

Going to a stereo installer tomorrow to see what they can do and then a junkyard that has a few Tahoe's after that

 

[setconstr]

So as it turned out there was nothing at all wrong with my rear blower motor it was all in the shabby work done to add a roof mounted DVD player. The harness was cut and stuffed into the headliner with a climate controller taped to the harness but it made the front rear control only work on speed 2. Anyway I found a junk 04 Tahoe got everything out of it the dome light and climate control the plastic piece that mounts to the roof and the harness, lots of wires to solder and heat shrink taped it all up with black cloth tape and it all works as stock , On to the next thing finally !!!

 

[wjburken]

So as it turned out there was nothing at all wrong with my rear blower motor it was all in the shabby work done to add a roof mounted DVD player. The harness was cut and stuffed into the headliner with a climate controller taped to the harness but it made the front rear control only work on speed 2. Anyway I found a junk 04 Tahoe got everything out of it the dome light and climate control the plastic piece that mounts to the roof and the harness, lots of wires to solder and heat shrink taped it all up with black cloth tape and it all works as stock , On to the next thing finally !!!

Sounds like a job well done. Definitely had to play detective on this one, didn’t you.

Have a beer or three and take a couple attaboys out of petty cash.

 

[setconstr]

Thanks !!, Had a few beers ....learned a lot about the rear climate control so all good. I now have lots of rear blower parts if needed.

 

[JonnyTahoe]

Thanks !!, Had a few beers ....learned a lot about the rear climate control so all good. I now have lots of rear blower parts if needed.

I had several issues with my rear Climate Control blower running with the ignition off and all the controls in the off position. whenever I would turn the ignition on the Actuators would make an annoying switching sound so I disconnected both of them and removed the Auto Climate Control resistor which was bad. Going to try the updated resistor which is much cheaper and see how it works. The Resistor for the Automatic Climate Control was updated in 2003 due to the issues with the earlier design.