M278 & M157 Water Pump Failure | What to Look For Before You’re Stranded! Water pump failures are becoming a big issue on Mercedes-Benz M278 and M157 engines. In this video, we break down exactly what happens from the water pump pulley walking out to the impeller wearing into the housing, leading to coolant leaks and breakdowns. We show real-world examples of why it’s important to address not just the pump, but also coolant lines, hoses, drive belt, pulleys, and tensioner during the repair. This
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M278 & M157 Water Pump Failure | What to Look For Before You’re St…
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