2002 Yukon Rear A/c Not Blowing Cold.

[cajunsuperduty]

2002 Yukon rear A/C not blowing cold. Front A/C works fine and blows ice cold. The rear A/C is blowing room temperature air or maybe a little warmer. The line going into the evaporator is cold and the drain line is steadily dripping water when the A/C is on, so to me this means that the rear evaporator is cooling and functioning correctly???

 

When I turn the temp control either all the way to hot or all the way to cold there is no change in the air temp coming out of the vents. It wont even get real hot like the front does if I go all the way to heat. I am wondering if there is a diverter of some sort that could allow the air to be belowing thru both the heater core and the evaporator. Could this diverter be stuck or not functioning properly? Any advice would be greatly appreciated.

[ScottyBoy]

Its the blend door actuator. The front AC and rear AC each have a blend door. Apparently the rear door is stuck.

[cajunsuperduty]

Thanks a bunch. I am assuming that this blend door is somewhere underneath all that interior plastic (lol) near the rear evaporator and heater core. I am also assuming the blend door is controlled by electric servo motor and not vacuum?

[cajunsuperduty]

Is the blend door actuator for the rear readily available at most autoparts stores or is it a dealer item? I am assuming that is is accessible under the plastic trim panels without having to disconnect any A/C lines.