I would insert as many as a few pint or so of distilled drinking water.. anymore and I'd personally pick up some coolant to mix. if it goes off once again, provide it towards the dealer. its probable just evap lack of the h2o part of the coolant blend. glycol https://carspoilersforsale24578.vidublog.com/26867454/the-basic-principles-of-types-of-coolant-for-bmw-335i