You might have a bad actuator ?
SOURCE: Yukon A/C, rear blows cold, front ducts a LOT warmer.
There is only one A/C system split into 2 zones. Check the blend door actuator, it may have failed in one position or something may be jamming it. Also check the control panel in the dash, My 98 yukon did the same thing, no matter what temp you selected for the front it would blow at about 70 degrees. There is a circuit board in the control panel that gets corroded and one of the circuits controls blend door operations. Have a look.
SOURCE: 96 suburban air conditioning blows out cool in front hot air back
Am investigating same problem. Download the free technical manual and you can find a diagram for the air mix door. If this doesn't shut you will be getting lots of heat through despite the cooling of the Aircon. I don't know how to get at it or fix it but it describes how to run diagnostics - you don't need specialist tools for this. Also a blocked pollen filter probably won't help.
SOURCE: raer a/c works but front blows hot air on my 99 tahoe
My 04 tahoe had to have the a/c door actuator replaced as well, same problem. 100.00 part from dealer if you want to do it yourself.
SOURCE: 2005 escalade rear a/c blowing cool air .front a/c blowing hot
More than likely, you have a blend door actuator problem. Locate the faulty actuator under the dash, usually on the firewall, and replace.
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