I'm going to have the evaporator replaced in my 95 140 in march. Independant shop estimates the cost at $2,500. They want to install a OEM part. I'm the second owner of the car but I know that the previous owner had this part replaced when the car was under warranty. Is there a better evaporator than the Mercedes part. The shop has said they only want to use a Mercedes evaporator because they will want help from "mother benz" if they get the part installed and it does not work. Any advice?