Quote:
Originally Posted by racepar1
That is NOT true. It is an expansion tank and the coolant will be sucked back into the system when it cools down. I don't know of ANY OE cooling system that does not have an expansion tank.
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Every BMW made in the past 30+ years...
They have a true expansion /surge tank, and when the cap pops the coolant goes all over the engine bay. It doesn't pop because there is air space in the tank for coolant to expand into.