Two problems related to defogger have been reported for the 2003 GMC Yukon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 GMC Yukon based on all problems reported for the 2003 Yukon.
Rear heater not working. On July 25, 2006, the dealer replaced:" compressor assembly-replace sensor, inside air temperature-replace, case, auxiliary heater one piece-replace" at 38,371 miles. Today, I returned to the dealer. Rear a/c is working but no heat through the rear heater. They replaced the actuator, but that did not solve the problem. They put the original actuator back and stated a rear control module would need to be ordered. Now the console lights on the rear hvac dials do not illuminate. I am awaiting the part.
Odometer reading and hour meter reading displaying alternately every 5 seconds while vehicle was garage parked and off, no key in the ignition, no other lights on. Dealer could not find problem, but re-secured ground connection. Also at various times hvac & radio face panel to hot to touch even with a/c on. Dealer re-programed something.