2nd Gen. 1&2 Series (2011-2021 | F20,F21,F22,F23)
can air trapped in the system cause coolant to disappear?
I previously had the overheat warning came up without any low coolant warning at all and found out the tank was empty.
I didn't know about bleeding or anything as I was at the highway and panicked so I just poured in distilled water...