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Is it safe to add coolant to a coolant recovery tank or coolant overflow tank while the engine is at operating temperature?

A Yes, if not part of a pressurized system
Some vehicles have sight glasses, see-through coolant overflow containers, or coolant recovery containers. These permit you to check the coolant level while the engine is hot. If the container is not part of the pressurized system, the cap can be safely removed and coolant added even when the engine is at operating temperature. Never remove the radiator cap or any part of the pressurized system until the system has cooled.
B Yes, but only if the coolant recovery container is part of the pressurized system.
C No, never.