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2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
They’re not.
I tend to also believe that a bad temp sensor is the only thing that will both give you zero temp reading and put the fan on full as a fail-safe default.
So I went and located the sensor. It’s not in the most “accessible” location. Not sure if by me tapping on the sensor or by playing with the wiring.. the fan stopped. May be a faulty wire/sensor, but the error is no longer current. The headache is def not over