The purpose of a radiator header tank is to provide a place for coolant to expand and condense before being recirculated, and thus to prevent the loss of coolant.
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Header tank
The purpose of a radiator header tank is to provide a place for coolant
to expand and condense before being recirculated, and thus to prevent
the loss of coolant.
The best picture
I've found so far from http://tuningpp.com/
Good explanation in French here
