I'd include as much as about a pint or so of distilled water.. anymore and I'd get some coolant to mix. if it goes off once more, deliver it on the seller. its probably just evap lack of the h2o percentage of the coolant combine. glycol doesnt evap as easily https://augusthdwne.blogunok.com/27523278/fascination-about-types-of-coolant-for-bmw-335i