im having the same problems
I replaced the pretty much everything that has to do with the cooling system. water pump, thermostat, radiator, all hoses imaginable (radiator, ones by the egr, heater hoses, ones that run by the intake), replaced the cap, even did a BHG job, did everything i could to get air out of the system. haven't heard the sound for about two weeks. but my coolant overflow tanks is always full after a drive!!! its sometimes gets so full that coolant will boil out and start dripping everywhere. there's no sign of coolant anywhere in the oil.
another issue is everytime i refill the radiator after it has cooled down, i will start the car and there's always a purge of coolant that rushes into the radiator and forces coolant into the over flow.
i am seriously sis of seeing green liquid. can anyone help me