I recently bought myself a EP3 30th Anny and wanted to make sure I had sufficient coolant in the system... you are all probably aware how much of a pain in the rear it is to check coolant levels especially if your reservoir tank has become opaque over time (even a torch doesn't help)... I ended up overfilling it and then syphoning the excess out.. Anyway during this process I couldn't help but think what the purpose of this tank was... I can see that the overflow pipe below the radiator cap pours in to this tank but I couldn't understand why there is a MIN and MAX marking on the tank... The tank doesn't feed back in to the cooling system (unless its via the overflow pipe and the overflow valve is a two way valve) and seems to only be used as a tank for the overflow to pour in to...so what the purpose of the MIN marking.. I understand the MAX can be for the maximum amount of overflowed coolant that should be in the tank before you need to empty it but I cant seem to understand why you would need a minimum amount of overflowed coolant? Any information would be much appreciated.
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