One problem related to air conditioner has been reported for the 2007 GMC Envoy. The most recently reported issues are listed below.
I bought a 2007 Envoy 10 March 2007. When the weather got warm I tried to use my ac. This is a brand new vehicle with less than 5,000 miles and the ac didn't work. I took it in for service and was told it was fixed. When we went on a trip and arrived in FL and it heated up, the ac didn't work. The first time it was repaired I was told it was a sensor. The next two times they replaced the compressor. The first time it was cool when we left and I tried the ac and it was cold. I had to take it in 3 times before it worked correctly. Now it is getting hot again and I think I am going to have the same problem. It is only 70 and my 1997 chevy cavalier cools better than my 2007 Envoy. I have had several other problems with this vehicle that have only recently been resolved. Each time I took it in I was told they could not duplicate the problem. I had a leak in the rear compartment, the drivers seat would not adjust sometimes and the stabilitrak constantly gave me a service light. This vehicle is only 1 year old.