Cooling/freezing liquid problem

Hi, when I drove to work today with my 2014 octavia 1.6tdi no warnings came up. Then it stood still the whole day and when i was starting it to go home, the cooling liquid sign popped right up.

I drove a while to see if It started heating and nothing happend until I had driven for a while.  I then stopped before it got to red, and filled liquid on it. But It got back on after a few hundred meters.. I filled it up again but the same thing happend, and it drips underneath it.

I eventually got it home and I filled it with water here, now nothing goes out of the tank..  But I have yet to start it.. Does anyone have any idea whats happening here?

Any suggestions is highly appreciated!