when was the last time you checked the coolant level in your reservoir tank?

if it wasn't too long ago, you most likely have a coolant leak somewhere, have the coolant system inspected for leaks.

coolant doesn't go THAT low for no reason.

 

Drove again this morning and everything was fine again; the temp was consistently at 8 bars (AP2).

I don't drive this car that much so honestly i haven't kept an eye on the coolant level. Now that ive learned my lesson, i will be more diligent about it going forward