When I do hard turning while driving my son's 1994 C280 I hear a squealing sound coming from the steering column. I wonder if it needs power steering fluid but do not know where the pump or refill reservoir is on that model. It sounds at times like it is coming from underneath the dash. Any suggestions?
Thank you very much

 

Try looking down in front of the engine on driver side, mine is down there, but I have a 99 with the V6. Your car is a straight six, but Mercedes has a tendency to place things like this in the same area even with an engines change, Mine is difficult at best to get too.