I called the Mercedes Tech that a dealer reffered me to, and he is familiar with my car since he did work on it and said he thinks its a water pump thats bad. I asked him how much would that cost and said about $400. So I guess you were in the ball park. Think thats a good price? I am a newbie to cars.. trying to learn as much as possible since I am first in my household to drive.. that includes BOTH of my parents

thanks!