Duramax Fourth Generation: 2007.5-2010 (LMM)
My issue has been intermittent over the last 5 months. One day, the A/C started blowing hot air, really hot. Took it to the ac so shop, and by the time they restarted it, it was blowing cold, and then stayed that way for a week. Went back to blowing hot air. The second time it did this, I...