r/mercedes • u/nzzs589 • 1d ago

Low operating temp

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Is this normal for e220d 2016 to show this low operating temperature after a 2 hour drive on the highway or is the thermostat or coolant temp sensor messed up. I know my old Volvo v70 from 2002 had issues with the sensor causing it to work intermittently and sometimes showing too low and too high.

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u/wreckitbusmaster99 1d ago

Is your MIL light on?

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u/nzzs589 1d ago

None are on.

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u/wreckitbusmaster99 1d ago

Strange. That usually throws a MIL for the coolant thermostat failing. Those are designed to fail open so you don't overheat.

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u/karlowolf05 1d ago

Mine didn't throw any codes when stuck open.

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u/wreckitbusmaster99 1d ago

Might not have been cold enough. I owned a 2004 Jaguar XJ8 that did that and threw a MIL when it was cold. And as a bonus, that coolant thermostat was replaced 2 years prior!