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Wow! Thanks for translating!
I think the light indicates a coolant-related problem, possibly low coolant level. I suppose, through normal driving, the coolant is circulating sufficiently enough to prevent the coolant sensor from detecting a problem.
I would check the coolant expansion tank first to see if there is enough coolant in the tank. If so, then perhaps the sensor is defective...
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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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