someotherguy
+1y
See just takes some info and some work. Glad you found it and things are working right for the most part.
G202 is supposed to attach at the DLC, in other words the scanner connector under the dash. There's a screw holding it to a metal tab on the dash, the ground wire goes there.
Having the G202 attached to other than that tab on the dash -MIGHT- be an issue; it grounds the dash stuff. I'd put it where it's supposed to be. I'd do that first before troubleshooting the A/C control issue further.
The A/C control symptom I have never seen; maybe someone may have tapped into the wiring for it for some reason. Maybe they tapped the wrong wire on it, to run power to a switch, or air gauge lights, something like that? Check the wiring to it closely.
Richard