LR000243LR - Radiator Cap

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Radiator Cap - screw-on pressure cap for the coolant expansion tank in the engine cooling system. The cap seals the expansion tank and holds the cooling system at its designed oper ating pressure, which raises the boiling point of the coolant. It incorporates a pressure-relief valve that vents excess pressure to the overflow, and a vacuum valve that allows coolant to be drawn back into the system as the engine cools. It also closes the fill point used when topping up or bleeding the cooling system. A cap that no longer holds its rated pressure allows coolant loss and can lead to overheating and repeated topping up, so it is commonly renewed alongside expansion tank or coolant hose work. Show more