One problem related to defogger controls has been reported for the 2002 Chevrolet K2500. The most recently reported issues are listed below.
The defroster kickes on in the middle of driving, since I got this truck. I will be driving down the rd, and all of the sudden my windshield fogges up very rapidly. Last time, a semi was behind us and my wife and son were with me. We were almost killed!!!my warranty was very short lived since this was used when I bough it. My wife, and son also drive chevys & GMC. I have taken it to dealers but they say I have to pay 100's of dollars to repair it, then it may not be repairable that it is automatic. We will never buy GMC or chevy again. It isnt even safe to drive in this vehicle!it happens all the time!.