Steve,

I don't recall exactly what effect causes evaporator icing but I can assure you it does happen. I have experienced it a number of times-- including on my old Euro 126 (and even my vintage Coke machine). I'll try to remember to ask my HVAC tech friend why it happens. Considering your statement that the 124 has a coil temp switch I'm guessing it doesn't happen in those cars.

///MikeR
'93 190 2.6 Sportline