Radiator resoviour tank flow

Hi guys just wanted to ask this question for a member of the forum who needs some help with his radiator coolant question.
Trouble is he does not have the best English skills to ask the question and be understood.

Alright, so the coolant tank or resoviour, should the water flow through the pipe at the top back in the resoviour.
As far as I know it runs through that when it's upto operational temp.
The trouble is he isn't wanting to run the car that long as he had head gasket changed along with the water pump and thermostat.

Thanks anyone who can answer this question or at least confirm what I'm saying is correct or not.


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