Well......maybe it wasn't the KLIMA. Why is it so hard for me to spell that word correctly? I have spelled it KILMA many more times.
Anyway, so, yesterday, I had one AC hiccup where the air started blowing warm. Cycled the key off and then restart the car and it was good the rest of the day. Here's my next hypothesis:
Full Throttle Microswitch
So, I know where it is located. Is it serviceable? Does it "stick"? Can it be cleaned? The one AC hiccup yesterday seemed to have occurred right after I started from a dead stop (red light) and I was in a hurry to get to my 2pm appointment. Maybe, I did "get" the throttle all the way open --- it's hard to tell from a dead stop in a 300SDL.