I have a 2002 Suburban LT with the automatic environmental control. On a cold start in the morning or after having the truck parked for hours, the A/C (temp control) cools great. Output temp in the center duct is about 45 deg F. The problem is when I have driven the vehicle and shut it off for about 30 minutes, and then restart, the A/C will not cool. If I fiddle with the controls, shut off the auto A/C for a few minutes, or just drive for about 30 minutes, it will start to cool properly again.
The dealer keeps wanting to work on the A/C system itself, but it cools so well when it wants to, that I think the basic physics package is working fine. I'm thinking control box?, modules?, computer?, whatever?.
Has anyone had a similar problem? Would really like to know where to look, or to be able to talk to the dealer with some knowledge. I put up with letting them change the orifice tube and low pressure switch, which of course, fixed nothing. Problem still exists.
Any help / suggestions greatly appreciated. TIA - HH