THE AC FAN BEGAN GOING OUT ON OUR 2004 CHEVROLET TAHOE ABOUT A YEAR AGO, FIRST HIGH SPEED (5), AND THEN EVENTUALLY MEDIUM HIGH (4), AND THE REST (3-1). AFTER SOME THOROUGH ONLINE RESEARCH AS TO THE PROBLEM AND POTENTIAL SOLUTION, I DISCOVERED HUNDREDS IF NOT THOUSANDS OF CONSUMERS WITH SIMILAR ISSUES IN THE 2003-2006 CHEVROLET TRUCK AND SUV. IT APPEARS THAT THE WIRING HARNESS THAT CONNECTS TO THE BLOWER MOTOR RESISTOR IS PRONE TO OVERHEATING AND MELTING CREATING A SIGNIFICANT FIRE HAZARD. I HAD NOTICED AN ACIDIC BURNING SMELL BEFORE BUT ASSUMED IT WAS OUTSIDE EXHAUST. I HAVE A NUMBER OF PHOTOS OF THE BURNT AND MELTED UNIT AND HAVE KEPT IT IN CASE NEEDED.