I might include as many as a couple of pint or so of distilled h2o.. anymore and I might get some coolant to mix. if it goes off all over again, provide it to the supplier. its probable just evap lack of the water percentage of the coolant mix. glycol https://automotive-accessories53119.blogolize.com/the-smart-trick-of-types-of-coolant-for-bmw-335i-that-no-one-is-discussing-66771656