After about 15 minutes in very hot weather, the AC stops blowing out the vents, but the fan is still running. I was told it was probably the condensate line blocked up, but I tried to clean it and it still does it. After you turn it off for 15 minutes, it unfreezes and starts working again....but only temporarily

 

-check for low refrigerant level
-when it stops working....rev and hold the engine rpm at 2500 for about 15 seconds...if the cold air comes back...the compressor is tired.

 

I was told the issue can not be fixed. I also have a copy of the service bulletin from GM. It states there is no fix at this time. I bought a brand new Colorado 3 months ago and have the same issue. If i drive on the xpressway for 50 to 75 miles in Humid weather the evaporator freezes up. I took pics. Four dealers have said sorry there is nothing they can do and called GM. Nothing they can do either.. I just emailed the BBB to see what they can do.

 

gm engineers will have to design a fix.

 

Well I took it into the dealer about 3 weeks ago, and they said something about a module behind the dash. If it was blue, it should be replaced with new green one. He printed out the bulletin about it, but said it would be like a stupid amount of money for the part and the labor. I decided against it and perhaps will do it myself if I ever find time!