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ok, you dont need a over flow tank, but if you dont want to refill your radiator every few weeks, then i highly suggest getting one. when the pressure builds up in the radiator, the cap wll relieve the pressue and send it down the over flow hose into the over flow tank. that way your radiator doesnt explode. then when the car cools down and the coolant in the rad condenses, it creates a vacuum inside the rad, itll pull open the other valve in the rad cap and try to suck back the coolant it sprayed out like a fat kid drinkin a milkshake through a straw. if there is no overflow tank, then its gonna suck in air. after awhile of spittin out coolant and suckin air back in, your coolant level will be low enough that there wont be enough coolant to properly maintain the correct temp of the motor and youll overheat. you will have to watch the coolant levels in your rad pretty often to make sure that doesnt happen. just get a overflow tank and save yourself a headache.
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