TL*THE CONTACT OWNS A 2005 GMC SIERRA 1500. WHEN THE VEHICLE IS SHIFTED INTO FIFTH GEAR, THE FAN STOPS BLOWING. WHEN SWITCHING BACK TO FOURTH GEAR, THE FAN WILL BLOW. THE FAILURE BEGAN IN DECEMBER OF 2007. IN AUGUST OF 2008, THE WIRING PLUG AND RESISTOR MELTED. THE WIRING PLUG WAS REPLACED; HOWEVER, THE METAL CONNECTOR IS DEFECTIVE AND WILL NOT ALLOW THE PLUG TO PROPERLY CONNECT. AS A RESULT, THE VEHICLE CAN ONLY BE DRIVEN IN THIRD GEAR. THE DEALER STATED THAT THEY NEEDED TO DIAGNOSE THE VEHICLE. THE FAILURE MILEAGE WAS 34,100 AND CURRENT MILEAGE WAS 37,000.