When the engine is hot, do the following

The car park side of the engine.Open the hood to vent heat from the engine as soon as possible. Do not pour the water because it will cause damage. If the water vapor ejected from the car hood. Do not open the hood. Wait until no steam, then open up.Wait until the engine temperature drops and then open the radiator cap, radiator cap, do not open immediately. Because the boiler is still hot. And high pressure water may be up to. Which is harmful and should wear gloves or use a thick cloth around the radiator opening.When the engine has cooled down. The water in the radiator. Do not fill in the heat.Gradually add water slowly. Idling with the air. When water is no longer available. Leaving for a while. Then see what is wrong.If there is something wrong. Brought the car to a service center for a thorough check of the S. If you find something wrong. Contact your nearest service center