We don't have a lot of GMC Sierra 2500 AC / heater problems on file — feel free to add yours here. The most common Sierra 2500 AC / heater problems occur at 130,000 miles. Click on a year below.

Worst AC / Heater Problems
resistor wire pigtail overheat and burn wires 2005 GMC Sierra 2500
AC pump failure 2005 GMC Sierra 2500
temperature adjustment for heat inaccurate 2004 GMC Sierra 2500