If the engine is not cool
when removing the radiator cap, hot fluid and steam could blow out under pressure and burn you.
Place a thick rag over the cap and remove the cap slowly to allow any remaining pressure to escape.
If it is difficult to get the recommended coolant, tap water can be used temporarily, provided that it
is changed to the recommended coolant as soon as possible.
again, ask a BMS dealer to inspect and/or
repair the cooling system