Yea, the water pumps on the 190e makes a hell of a racket when the bearing are getting ready to go. More racket than most I have heard. If you can't get it changed right away, make sure you loosen your belt tension as much as possible so you don't hasten the death of the water pump by over stressing the bearings.

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89 190E
2.6L
Arctic white
Grey leather
Sunroof
Pirelli P400 rubber
Smoked corners