Thanks David. Here are the codes I got from the display...I erased them once and they all came up again the second time I did this.
I am not sure what these mean, but I hope each one is not a separate problem.
Thanks for your help, my friend thought that getting the codes right off the A/C was the coolest thing.
1998 ML 320
1994 Blue C220
Im going to Grad School @ the University of Iowa