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[cuz 62]

how much water if any should be in the radiator overflow tank when the engine is cold

[Guest]

how much water if any should be in the radiator overflow tank when the engine is cold

Up to MAX level - min level when hot.

Cheers

[TonyN]

You should have Full and Low on the header tank. Anywhere between these two is OK, but if your filling it up, fill to Full according to the Owners handbook.