I was a noob.
Changed the coolant but didnt put the bleeder valve back on and drove off. The cool temp gauge reached 3/4 before the HOT TEMP (teel color in the picture). Car didnt throwout any CEL.
But about 3L of coolant did evaporated. I Added back the coolant and car seems to run fine. No white smoke.
But I was wondering what longer term damage have I done.
Thanks for any input!