This is not unusual. You should check fluids regularly. Please add distilled water to your expansion tank until it is full. Best practice is to fill it when the car is cold.
Note that if the system was very low on coolant, there may be an air bubble. Don't be surprised if the car asks you to again add coolant in a couple of days. That is not a problem.
On the e9x series cars (I haven't tried it with the f30) you follow this procedure to bleed the system:
Turn heat all the way up
Put fan on low speed
Turn ignition on, but do not start engine
Hold throttle pedal all the way down, past the kick down switch, for 15-30 seconds
When you open the coolant filler cap (again, cold engine) you should see the water circulating. This will get all the air out of the system.
You should give this procedure a try. It couldn't hurt...
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