Mercedes-Benz GLK250 low coolant message due to oil line seal failure and coolant contamination on Mercedes-Benz GLK250

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

Problem overview

Some Mercedes-Benz GLK250 owners report experiencing low coolant warnings, which are often indicative of issues within the coolant system rather than oil line seal failure or coolant contamination. This warning can lead to engine overheating and potential damage if not addressed promptly. Owners have noted that the root cause of low coolant levels is frequently linked to failing coolant pumps or thermostat gaskets. It is advised to check the coolant level when the vehicle is on a level surface and the engine has cooled down for accurate readings. Additionally, some owners find it necessary to pull over and turn off the engine immediately when the coolant light activates to prevent further damage. Addressing these warnings swiftly is essential for maintaining the performance and longevity of the Mercedes-Benz GLK250.

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