I just did a little research and it looks like I do have one in the back too. I will know for sure when get my hands into the back and see.
Weird how I had the problem last year and the front one was bad and I would get heat out of one side cool air out of the other and back. Then heat out of both front, cool from the back. It really had no rhyme or reason what vents would blow cold air and shutting it off and starting it back up would get all 3 blowing cool air. Now I recall I would have front and rear blowing cool and it could be 5 minutes or 20 minutes later it would revert back to blowing hot air out of something. Front one solved it all, now just heat out of the back and shutting it off and restarting gets it blowing cool air. I know it had to have just gone out in the past week and really don't know if it will revert back to blowing hot air as time goes on.
Just weird how when I changed the one under the glove box which was really easy, and all worked great.
I looked on Amazon from a pic I came up with and found the part number for AC Delco 15-72972 which cross referenced from a part number I found on one someone took out of the rear 52402599.
TEMP VALVE - AUX HTR, REAR (C36) - AUXILIARY - A/C FRONT AUTO/AUX CONTROL (CJ2) - REAR AUX A/C (C69)
I am going to try to pull it apart tomorrow and see if their is one back there which looks like 99.9% sure their is.
I babied this Tahoe since day one and I guess with 75K on it I have been pretty lucky with just minor things and doing the maintenance on it like it should be done.
If it is not one thing it is something else to fix... Fixed my buddies Kitchen Aid mixer the other day, today had to tear down my Sister's iPad and put a new display in it and glass from when she dropped it...
Always something to fix right?
Originally Posted by Paul Greathouse
I'm assuming it will be the same on a Yukon as on a Tahoe. On my wifes 03' Yukon the rear air conditioning blows hot air no matter what the setting on the overhead rear controller. The front AC works fine. Anybody dealt with this problem yet?