~ What condition my condition was in ~HELP!

I’ve got a 92’ Buick LeSabre custom, that’s decided to emerge as a pain in my ass; it’s moody and occasionally won’t start. Has anyone ever experienced this: Getting under the hood to loosen both battery-cables, inspect, clean, then retighten, and then while finally getting it to start- you then notice the ‘defrost’ button on the console is illuminated and somehow managed to turm itself on full-blast !?? Pretty odd… is there some sort of ‘computer-chip’ issue going on here?? Any advice at all would be much appreciated !! Thank you!!

Sincerely, -ANTHONY- prefers_jazz@yahoo.com