I've had the same A/C problems since I've had the vehicle, sending it in numerous times while under warranty to get the problem fixed, only for the mechanics to tell me there is nothing wrong with my vehicle, making me look like a fool, when there is obviously SOMETHING wrong if my A/C doesn't throw COLD air! I know the difference from cool air, and COLD air! My 92 Honda Accord threw colder air than this hunk of junk! And yet, when I ask them about the lemon law, they can't find records of me bringing it in for the same problem more than 4 times, or they fixed something else on it. When they've never fixed the problem to begin with!

I've been dealing with this same issue since I've purchased it in November 2010. I figured since it only had one owner, and then was used for 1 year as the shuttle vehicle for the dealer that I would be purchasing a great vehicle that was taken care of, but rather, I've purchased a vehicle that was probably a problem for the 1st owner, they just knew to get rid of it from the beginning! I've never had this issue resolved, and still to this day, deal with no A/C in the summer months! Some summers it's not too bad because it hasn't been hot enough, but others, it's completely ANNOYING! For what I've paid for this vehicle, I shouldn't be dealing with this issue at ALL!! With all the other issues I've been dealing with, this is just the tip of the iceberg! I am surprised that there are no lawsuits against GMC for the crap they sell to honest, hardworking individuals....rant over... on to the next issue!

A/C actually went out the year before....Took it to the GM dealership at that time...they said they couldn't find a leak..put freon in it (for $80) and said come back when it fails.

Managed through last summer but it failed at the beginnig of this season....Took it back to the dealership...They said they found the leak...problem was the line between the evaporator and condensor, replaced it for $490. A week later, it failed again....Took it back to the dealer....say they don't see a leak, recharged the freon and sent me on my way again till failure. pain in my a--.

Update from Jul 7, 2012:

Well, it failed again about a week later....Took it back to the deaership....This time they say they found the problem. It is a failed evaporator core. This component is behind the firewall and requires ~12 hours of labor to pull the dash and center console out of the vehicle to access and replace the component.....

Fortunately, the dealership is working in conjunction with GM to provide the fix for only ~ $100. I would have been very upset if I had to pay a $1500 repair bill but GM and the dealership has kept GM on my list of manufacturers to buy from by addressing this issue for a reasonable cost.