2001 Chevy Suburban: Front A/C is very cold...Rear A/C blows warm

2001 Chevy Tahoe Heat Problem - Tahoe Forum

www.tahoeforum.com > ... > Technical Discussions
Dec 5, 2008 - 10 posts - ‎7 authors 2001 Tahoe, the front heater blows a little hot air when the car warms up and then blows cold air. The rear heat seems to work fine. I changed ...

Rear AC blows hot air - Tahoe Forum - Chevy Tahoe Forum

www.tahoeforum.com > ... > Technical Discussions

Jul 14, 2008 - 10 posts - ‎5 authors
On my wifes 03' Yukon the rear air conditioning blows hot air no .... Pull the panel off and look at the hot/cold actuator shown in the picture.

There's a valve between the front and the back that is supposed to open automatically. I have the same problem on my 1994, but in reverse, I get AC in the front, but it just blows hot in the back. I was told that this valve might be stuck... but no one would tell me where it was or how to get to it and no mechanic wanted to fix it for me. Apparently, if you can find it, it's easy to get it unstuck. Good luck.

I would agree it might be the valve.
One line should be cold and the other warm or hot.

see if theres power to the rear blower motor go under the rear and see if the one pipe is cold and the other is hot or at least warm if there the same then the rear system is plugged

There is a blower motor control processor for the back blower - it takes input from the front control and the rear control and decides the fan speed. That processor could be faulty, or the blower motor, or a 30amp fuse in the engine compartment.
In the front system you have a controller and blend doors that direct air thru the heater core and evaporator. You would need to check the operation of those blend doors.

they run off of the same compressor if rear is cold and front is hot the hot and cold function in the heater box is not working possible cable problem ? or a vacum line under dash

if its the computer climate controlled series then it might be the the vents. what happenes some times is the vent wont switch over from hot to cold or vise-versa. i had the same problem but reversed, no heat in front and it worked up to the last time i had switched it from hot to cold.
give it a shot, best of luck

I believe there is a expansion valve located on the back part of the air conditioner on the back right side i believe that could be the problem. I think if I am understanding you correctly, your back air is not as cool as it should be or not cold at all. Might want to check this. If I am not understanding you correctly please let me know again what your problem is.

The car uses the same freon in the front as it does in the rear. If the rear a/c is working, you either have a plugged evaporator in the front unit, or perhaps a bad heater switch. Try switching the heater to hot and see if it blows even warmer air from the front vents. If so, the heater switch is working and then it sounds like a plugged evaporator or maybe a plugged orifice tube. That is a good place to start looking. Hope this helps.

I have the same problem with my 2001 Tahoe. The front blower is working, its blowing strong, but its cold air even with the temp setting as high as it can get. The rear blows hot air. The engine temp guage is at about 210ish which is close to being normal (220). I just replaced the thermostate a few months ago, I don't know if its bad again, or it I deluted the antifreeze too much and it frooze the heater core, or if the heater core just went bad. Any one know what the cause could be?