SOURCE: 1998 tahoe ac
there should be some aluminum lines under the truck on the rear of body, feel these lines with the a/c on, if they are cold then there is something wrong with your rear blen door, blend door is the door controling the cold or hot desire position, sometimes it is controled by vacium and sometimes it is electrical, if lines are cold what most likelly they will be then have the rear belnd door actuator inspect.
SOURCE: 99 tahoe, rear air is cold, front air is warm, has
either a switch is bad or a electrical operated door failed within the duct work. . This vehicle has the abililty to set a code for this condition and only the dealer and some shops have the diagnostic equipment to diagnose this cortectly the first time.
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