Rear air not cold. Front air is.

[fast_jason]

Hi Everyone,

I got in my Tahoe the other day and turned the rear air on to cool my little guy off. I looked back after a few minutes and he was still sweating. I reached up to adjust the vent to blow on him more and noticed it was warm air. I quickly checked the controls to make sure I didn't have it on heat. The front a/c works great. Any reason the rear air is blowing warm?

Thanks in advance!

 

[07Burb]

A member last fall had this same exact problem and he detailed his fix in a thread. If I can remember who that was I'll track down that thread for you. Give me just a few minutes

---------- Post added at 10:07 AM ---------- Previous post was at 10:04 AM ----------

Here it is not last fall like I thought but

http://tahoeyukonforum.com/forum/showthread.php?t=15787&highlight=blend+door+actuator+calibrate

 

[fast_jason]

Thanks! I will give it a try.

 

[kses123]

I just fixed mine. It was doing the same thing. I had to get a new actuator module for the hot/cold. I also got the updated controller module (computer) for it. It has updated software that prevents it the actuator from over-travelling and ruining itself. It was a quick and easy fix.

See here:
http://www.justanswer.com/uploads/Bluegorilla/2009-02-19_151400_2003-2006_taoe_rear_heat.pdf

 

[Chads93GT]

The other culprit is the expansion valve getting plugged. Ie. trip to a mechanic for a system drain. New valve. Then a recharge. I tested the electronics first. When that failed it left one possibility. Expansion valve. Luckily the part is cheap. Just takes a while to replace.

 

[DenaliAK]

I have the same issue. I replaced the actuator, which was fairly easy, but it did exactly nothing to fix the problem. I'm broke and have other mechanical issues to deal with first, so I haven't had a shop look into it yet.

 

[chip]

I have the same issue as well. I did the actuator, but it looks to be the expansion valve.

 

[kses123]

I have the same issue. I replaced the actuator, which was fairly easy, but it did exactly nothing to fix the problem. I'm broke and have other mechanical issues to deal with first, so I haven't had a shop look into it yet.

Did you replace the control module as well? It prevents it (supposedly) from happening again. See my post above with the link for part numbers.

 

[terrible_buddhist]

I can't say this will work for anyone else as I am fairly convinced this was a coincidence....BUT, I was having the reverse issue (back cold, front hot) I plugged in my scanner...did a code search, nothing came up, and the air started blowing cold again.

 

[kses123]

Yeah, just a coincidence.