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Old 07-13-2008, 05:37 PM   #1
Paul Greathouse
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Default Rear AC blows hot air


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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?

Last edited by Paul Greathouse; 07-15-2008 at 10:03 AM.
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Old 07-17-2008, 09:27 PM   #2
Holikz
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Quote:
Originally Posted by Paul Greathouse View Post
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?
The actuator most likely not working, you need to replace it since it cannot be fixed. it should cost around $80 to $120 from the dealer. It's easy to change it.

Note. just make sure you change the correct actuator since the there's two of them, one changes the air from top to bottom and the other the air climate.
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Old 07-18-2008, 03:38 AM   #3
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Originally Posted by Holikz View Post
The actuator most likely not working, you need to replace it since it cannot be fixed. it should cost around $80 to $120 from the dealer. It's easy to change it.

Note. just make sure you change the correct actuator since the there's two of them, one changes the air from top to bottom and the other the air climate.

Thanks for the reply. Where in the vehicle is the actuator located and how do I tell the two different ones apart?
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Old 07-20-2008, 03:26 PM   #4
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Thanks for the reply. Where in the vehicle is the actuator located and how do I tell the two different ones apart?
Here's a link to a the picture where it will show you.

http://cid-78eb12eecf6c4e5a.skydrive...#37;20havc.jpg
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Old 07-21-2008, 09:00 AM   #5
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Originally Posted by Holikz View Post
Here's a link to a the picture where it will show you.

http://cid-78eb12eecf6c4e5a.skydrive...ear%20havc.jpg

Thanks for the picture, that definately pin-points it. Never would have guessed it would be back there. Is the picture of your own vehicle or is it from a site somewhere on the web that supplies repair tips?
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Old 07-22-2008, 06:55 PM   #6
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Originally Posted by Paul Greathouse View Post
Thanks for the picture, that definately pin-points it. Never would have guessed it would be back there. Is the picture of your own vehicle or is it from a site somewhere on the web that supplies repair tips?
I was on the same boat when I was trying to find out where it was, the picture came from of another member but I have the same vehicle.
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Old 07-23-2008, 05:07 PM   #7
east302
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Just FYI, I had the exact same problem on our 2003 with the auto a/c controls.

Pull the panel off and look at the hot/cold actuator shown in the picture. Note the round indictor on the top with the slot in it. Put the a/c control to full cold and see if that thing turns or not. Switch it to full hot and see what it does then. If it turns smoothly from one end to the other, then the actuator is probably fine. If it kind of hunts, then that (could) be the problem as that is what mine was doing.

Compare it to the operation of the indicator on the floor/ceiling actuator to see how it should act.

On ours, I replaced the actuator itself and it fixed the problem.

Alternately, it could be the control module located between the hot/cold and floor/ceiling actuators. If I remember, it has gray and blue wiring harnesses on the bottom. I had replaced mine before doing the actuator and it did no good...stuck on cold. But, I've read where that fixed some people's problems.

I ordered the actuator from rockauto.com (AC Delco part #1572972) and it was around $90.

Hope this helps,
Scott

Last edited by east302; 07-23-2008 at 05:27 PM.
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Old 05-26-2014, 01:19 PM   #8
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Thank you for*your posts!*Very interesting!
dubli

Last edited by Onatebuawer; 06-19-2014 at 04:36 PM.
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Old 07-28-2014, 03:12 AM   #9
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I had the exact same problem... Well kinda.... I have an 05 Tahoe and the Blend Actuator on mine was located under the glove box and very easy to change. Mine would follow no rhyme or rhythm with the tri-cool blowing warm out the driver, cool out the passenger and rear. I would always change where it decided to blow cool air. I would have to shut the tahoe off and then it would most of the time pick up and blow cool air out of all 3.

Now I got the same problem again, except it is just blowing hot air out the rear and the front is blowing cool air all the time. Same thing... Shut the tahoe off and start it back up and if it blows cool air I am all good, but sometimes hot air again and shut it back down and then cool air comes out...

Does anyone know if there are two of them? One under glove box and one in the rear too? I will check back here to see if anyone knows, but if I have a chance this week I will pull the back off like in the picture and see if I have two of them. Not sure if GM relocated it from rear to under glove box on the 2005, but I have to get this fixed. It worked great for almost a year, maybe 9 months but now just hot air blowing out back just like the post said.

I will tear mine down and see if someone is not sure on the 2005 Tahoe.
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Old 07-28-2014, 04:17 AM   #10
Bald Jerry
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Default Getting Hot air out of Rear AC Vents


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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?


Quote:
Originally Posted by Paul Greathouse View Post
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?

Last edited by Bald Jerry; 07-28-2014 at 04:25 AM.
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