Hello.just got a 2002 mini cooper s .notice water was in the radiator and a little leak which I now found.it started to overheat the water would back up in the tank.
I change the thermostat, water pump and fan .but stil having the same issue .the water is stil over following through the tank in about 10 minutes

Need some help asap please.

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Start by checking if the system is bled properly. Then pressure test the cooling system. If the system will not hold pressure and there are no external leaks the head gasket may be faulty.

- Nick