You are lucky that you are in Columbus and not in Cincinnati. I contacted Ed Potter MB dealership and they said they would do the evaporator on my 92 500 SEL for about $2600. Here in Cincinnati we have only one dealer that wants $4,000 alone just to do the evaporator. I am curious if the evaporator that was replaced in 97 is aluminium? I asked the parts shop and they had a German Aftermarket for $299 compared to the over $600 for the OE. Lee, is the $299 unit made of copper and possibly have a longer life. I would hate to spend $4K here and have to do it again in 3 to 4 years. Also what are the symptoms of a blown regulator resistor because I try to be on the lookout for the common problems of a W-140.