I would include up to about a pint or so of distilled water.. any more and I'd personally get some coolant to mix. if it goes off yet again, convey it into the seller. its probably just evap lack of the water portion of the coolant combine. glycol doesnt evap https://automotive-near-me02801.free-blogz.com/74516341/types-of-coolant-for-bmw-335i-secrets