My 323i 99 BMW Help?

My 323i 99 BMW, was leaking water from under the car. I heard a bust sound just before water started to comeout. What you think it could be?

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it blew a radiator hose or heater hose or the radiator

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Check Bahr plastic radiator neck. Front-Left radiator hose connects to this plastic neck. Over time it gets brittle and snaps off. Sending coolant everywhere!

Plastic thermostat housing - same problem. Is plastic and sometimes cracks open. dripping coolant afterward.

Water pump plastic impeller - water pump impeller is made out of plastic. Gets brittle over time and snaps off inside of engine. Drops coolant %26 over-heats engine afterward.
If you are lucky it will only be a burst or disconnected water hose, and this is a good place to start to look.

You will find them connecting the radiator to the engine and heater, and to the reservoir tank. If this is the case, the fix will be easy and quite cheap.

If water is coming out quickly you would be well advised not to drive the car until it is fixed.