I just had my Harmonic balancer replaced on my 112 (car is a '98 C280). When I picked the car up I drove a short distance to the gas station. I got out of the car and it was running I could hear what sounded like the belt squeeling. I immediately took the car back to the dealership and of course the service dept. had just closed for the day. I brought the problem to the General Managers attention, he said no prob. we'll take care of it tommorow. So I called the following day to schedule an appointment. (The balancer was replaced on Monday-meanwhile the squeeling is getting more apparent) They said the soonest they could get me in was Fri. morning. I took the car in today,my service advisor told me that the tech. probably forgot to adjust the belt tension. A few houres after I dropped it off my servive advisor called me and said (guess what) "the squeeling is coming from your water pump, we can replace it for you today for $640.00". This problem did not exist before the harmonic balancer was replaced, and the car has never run hot. What do you all think, could improper belt tension take out my water pump? Or is this just one of those "things"?