as Kiss sang it...Hot Hot Hotter then Hell

[Bozowolf]

A few days ago the heat wouldn't kick on then finally it did nice and toasty. Now when I turn the control to AC, the system blows lukewarm slightly humid air. The compressor clicks on. The evaporator is functioning normally as evident by the puddle under the car.

It's like I've got a vaccum problem somewhere in the controls and a door in the duct work isn't closing (all hoses seem fine visually.) Right now Atlanta is still hot enough in the day time to need AC but cool enough at night that light heat is nice to defog the windshield.

Additionally I don't have the ATC since my GM is a base model GS. And this issue was not covered in the Haynes manual.

[88grandmarq]

most of the newer stuff uses servos/actuators to operate the various HVAC functions and mode doors. most of it is also controled by some sort of electronic module.
the system may simply need a new/updated flash program to work correctly or you may have a faulty actuator or both.

contact the guys at Geve Evans Ford... they seem to know what they are doing.