It can't hurt to get a charge on your A/C and have the A/C shop put dye in it at the same time. Pray that it lasts the summer. If not - take it back to the place and they can tell you where the dye is leaking. If it's from the condensation drain tube from the evaporator, you're screwed.

i just had this part replaced on my 95 E420 yesterday. $2050. Ouch. I used the aftermarket ACM evaporator, and it save me $600. The OEM part, which sucks, costs $895.

The only problem was that the ACM evap. didn't quite fit perfectly - so the shop had to cut and seal my heater box a few fractions of an inch. Shouldn't be a problem.

Best of Luck
Troy
1995 E420 77k