Did you poke into the hole with a piece of wire? There may be some sediment blocking the hole. The coolant will drain better if the rad cap is off. Note that the waterpump shaft can rust and cause the waterpump seal to leak. The sealing faces may still be in good shape; the rust on the shaft will allow coolant to creep past the stationary seal element. If your gearbox oil is off-colour, it could be getting mixed with coolant. The coolant level is normally a little above the rad fins with a cold engine.
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2011 EC250E
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