discussion M47n 120d Overheats

Hi Fanatics
Please help, Bmw E87 120d M47n motor, I drive the car for about 60km without any issue and when driving back home within 10km the yellow temp light flashes twice and then gone untill I reach home, today in the morning the water/coolant is empty. Refilled drive for 11km the yellow light flashes and the car goes into limp mode, stopped untill it cools down, no sign of coolant. Water pump is still in good condition, last week I replaced thermostat. Bleeding procedure done several times. What am I missing?
 
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