Quote:
Originally Posted by Bibio
first off its an expansion tank not a rez. when the coolant gets to a certain temperature the radiator cap opens up (thermostatic valve) to allow coolant to flow into the expansion tank. when the coolant cools down there is a bleed hole in the radiator cap to allow the coolant to drain back into the radiator. any excess coolant in the expansion tank will overflow out. this is fine and you should not top your expansion tank up afterwords as its now at the correct level.
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My memory of cooling systems is as follows:-
The radiator cap is just a sealing cap enabling radiator filling, the thermostat just allows water to circulate around the cooling system at a preset temperature thus speeding warm-up, and the expansion tank cap should have a pressure relief valve on it to vent excess pressure to atmospere in the event of a cooling malfunction.
That is not quite what I read in the above quote.
SVGrandad