Join Date: Dec 2005
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The header tank is the plastic container where the coolant filler cap is located.Years ago the header tank used to be built in to the radiator,but on most cars nowadays there is a seperate container which usually has the level indicator on it.
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo