Hello, I had the last thing in the mountains quite abruptly already before the engine start the message “cool water level too low, motor immediately put off” in the display. First of all a shock and then the question, what to fill up? Since an acquaintance of mine with almost identical. Car had exactly this problem now, I want to calm the affected here a bit. The sensor seems to be oversensitive and complains right at 1cm under min., In cold it seems to be quickly reached and oblique standing probably also helps. Please do not drive to the gas station and fetch coolant, it is enough according to the information of my one slump of tap water, with me < 0,2 l. Does not need to be distilled water. Nevertheless, I will soon have to investigate the cause, because somewhere the stuff must have remained, although I almost believe that there is so crunchy filled up on the factory side, which is triggered even with the slightest loss, the error message. So please do not scare at all, is probably usually only a small matter (and with me it was not less afterwards).