Heater/blower electrical system defect in original design..... 18,234 miles(10/26/2007):heater/blower motor only worked on high...dealer replaced under warranty the resistor and connector to the blower since it was melted 51,612 miles(6/4/2010): Same problem: Heater/blower motor only worked on high...dealer replaced the resistor and connector to the blower since it was melted. We paid for this one 73,853 miles(11/26/2012): More issues with heater blower. Blower intermittently works. Replaced the resistor. Power to motor...replaced the blower motor. 74,313 miles (12/21/2012): More issues: Blower only works sometimes. Burned connection at right kick pillar/ power at fuse, but not to the blower. Terminal for power at connector behind kick panel on right side had poor connection and burned connector. Dealer had to cut wire out of connector and bypass to repair. Have contacted GM...even though this problem is in the NHTSA database and reported on other websites, they take no responsibility for the design problem.

- Houston, TX, USA

Htr/ac blower motor won't work at 3 lowest speeds, only works at #4 highest speed. Temporary fix at wire connector by cleaning a burnt connector. Finally failed again in less than a year. Truck is out of warranty, dealership claims they never heard of such a problem, but think that a new blower motor would solve problem. I disagree. It is a fairly cheap fix involving new connector, proper grounding, etc, and should be covered in or out warranty since it is a design problem. I've been a longtime GM buyer since 1964, but am nearing the end of my patience with them. Too many problems that they never recognize as widespread.

- Fletcher, NC, USA

2007 Chevrolet Colorado. I am encountering a condition which was initially only very irritating but I now consider to be hazardous. The heater fan motor periodically stops working and after a few days will resume working. I have had a few occasions when I could not defrost my windshield in icing conditions. The fan motor quit and the windshield quickly frosted causing loss of visibility. On one occasion it was difficult to see well enough to bring the vehicle to the roadside (the date entered covers a few months).

- Johnstown, NY, USA