Mercedes-Benz 300E Problem Report
Mercedes-Benz 300E Check Belt Tensioner When Replacing Water Pump
A coolant leak may develop from the water pump. When replacing the water pump, the drive belt tensioner should be inspected and most likely replaced as well.
Belt became loose & inspection revealed rubber bushing detached from tensioner. Full replacement fixed problem. - Merk63
I've had to have the water pump replaced 3 times beginning at 130,000 miles every other year. After the water pump was replaced the tensioner had to be replaced. - Visitor
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