If rear a/c blower motor working but just not cold, it's going to be a clog expansion valve for the back unit, if not blowing air bad blower motor.
SOURCE: have a 1999 GMC Suburban
There is a actuator motor not working .The actuator motor moves the temp door,it is located on the bottom of the blower box,under the dash ,in the middle,it is a flat box,with three screws holding it on,change this out and the problem will be fixed.If this was at all helpful,please rate thank you.
SOURCE: Front air condition does not blow cold. Rear air condition does
sounds like a damper door in the front not working properly, these are actuated by the front temp control, the door is operated by either a manual cable, and electric actuator, or vacuum. I hope this helps you zero in on your problem. Merry Christmas
SOURCE: Rear a/c not blowing cold, front works fine.
you may not have enough refrigerant. a low charge can cause the rear in this dual system to not work for beans. charge with a can of uv and find the leak. fix the leak. evac the system and recharge. i think you take 4 lbs, but check the accumulator sticker. you may want to just change the accum at the same time.
SOURCE: 1999 Suburban, A/C on warm air from front vents, cold air in rear
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.
SOURCE: 99' Escalade a/c front vent blows cool air an rear blow cold air.
i have the same problem, my rear a/c blows great very cold, the front a/c blows but it is not cold at all. I had the the a/c seviced and it was vacumed and correct ammount put back in, no problems, the front still blows but it is not cold, i have checked everything and the a/c guy said it might be the door not opening. any help? still not working
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