First of all, dont ever add water to a hot/warm engine,ever!!
Second, what is happening is that the water is boiling inside the block (expanding) and creating vapor, so basically you have a big coffe machine.
Try this.
shutdown the engine, wait until is cold to the touch, remove the upper rad hose, with the rad cap off and add coolant (or whatever you add) thru there, until the radiator overflows. Add it slolwy. As of now you have removed almost all the air inside. Put the hose back, refill as necessary, open the bledder screw, turn on the heater (at least move the slider towards hot) then start your engine and continue to add coolant slowly. Fill the overflow tank, wait until the guage (is useless anyway) move to the middle. Slide the heater back to cold and there you go!
It helps a lot to raise the front of the car as high as you safely can (I use ramps).
Also, next time you want to flush the system, dont let block dry as you may did (not on purpose of course)
Also, make sure that the thermostat is opening!!
hope this helps!!
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