BMW is overheating is it possible that I overfilled?

Yesterday my hose that connects to the radiator just blew off and antifreeze went everywhere. I had the car serviced about a month ago when my fan belt broke which caused me to have to replace the belt, fan, waterheater, and thermostat. I was told at that time my radiator outlet (Im not sure what its called but its what you connect the hose to) ridges were worn out which didnt allow the hose to fit securely. Anyway, of course I ignored it because it didnt seem logical to replace it because it was worn out. I figured I would put a better clamp on it, so I filled it back up and but a better clamp on and it stays on now but it still overheats after 20 min of driving. Could I have overfilled or is there something else? Is the mix wrong?

BMW is overheating is it possible that I overfilled?computer

Your "waterheater"? To me...the "waterheater" is the engine.

Basically, this is your problem:

There is a loose nut messing with things it shouldn't be. You can locate this nut by checking behind the steering wheel any time the vehicle is being driven. This nut will cause more harm then good if allowed to stay in place. If at all possible, remove this nut permanently from the vehicle as it has no useful place in an automobile.

BMW is overheating is it possible that I overfilled?free spyware

your water pump could be seized up!

dont drive it

next thing you know youll have blown head gaskets!

also

check that all hoses are in good working condition

no holes, tears etc.
It could be the water pump or when you had the previous problems with the radiator, you may have cracked the head on the motor.
Its either the water pump which I've seen go bad more than once on bmw's, or the radiator. You can call the dealer and they should tell the exact mix for your model, and what type it uses.