Mercedes-Benz CLS550 coolant running out, needs turbo coolant lines redone on Mercedes-Benz CLS550

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Mercedes-Benz CLS550 owners report experiencing coolant leaks in the turbo cooling lines, which can occur due to the lines becoming brittle and cracking over time. This issue can lead to coolant loss and potentially cause the engine to overheat, resulting in serious damage. Once a turbo cooling line cracks, owners must replace the damaged line to prevent further leaks and maintain the cooling system's functionality. Accurate diagnosis is essential, with many owners checking the coolant reservoir for signs of leaks to identify the problem. Repair costs can be significant, with dealerships charging around $2300 for replacing the turbo coolant lines along with a water pump. Additionally, some owners emphasize the importance of regular maintenance, including inspecting the coolant system for leaks and ensuring proper coolant levels, to help prevent these issues.

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