Adam after 3 days at the tow hook

Hello everyone, I’m new to this forum and I have something to report about. Yesterday our 3 days old Adam (1.2 engine) showed up after 1km drive at once in the display “Motor overheated”, and the engine temperature indicator was on maximum. When we stopped there we already saw the steam coming out of the hood. A look at the cooling water tank confirmed my assumption that this was completely empty, good 2 liters could be refilled. Then was then also to beoba we called the Opel service, which sent a breakdown service past. This advised us to continue driving, and so our 3 day old Adam landed with 107km on the clock at the tow hook direction FOH. I am already very excited what this will tell us on Monday as a cause. Has one of you already with a leaky cooling circuit to his had to fight Adam?