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We would probably call the "Do Not Remove" cap the radiator cap. In most cars that cap is on the radiator. First - NEVERremove the cap unless the engine is stone cold. Hot water and steam could blast out of the radiator and burn you! Normally you would add coolant to the overflow tank if you are just topping off coolant that is a little low. If you have overheated the engine or blown a hose and lost most of the coolant, you would have to remove the radiator cap and refill the system there. If this happens, check a repair manual for your car, because some cars have a procedure to purge trapped air from the system that MUST be followed, otherwise the engine could be damaged.

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Q: Do you add coolant to the over flow tank or the do not remove cap?
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