[RWS-F30]

This is the third time within a month I have Low Coolant Message on the Nav Screen. Because I am driving the Nav comes back on the screen before I can pull over to write it down and I just have a warning light on the dash. I check the coolant and it is good. When I restart the car the message and light are gone. Check it at the dealer and they found no problems but they are ordering a new expansion tank with sensor. Does anyone have the full content of the message?
I am surprise that it does not leave a code and BMW does not have the exact wording available. They have seen the triangle with the exclamation mark in yellow. But they have no way to know what it is for because the message disappears. Any help would be appreciated at this point.

[adeelabid]

Did you figure out a solution to the problem? i'm facing the same problem.. gave my car to bmw for checkup.. they say its a common problem with all the f30s.. I believe its a sensor or electronic problem!