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Expansion Tank

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Expansion tanks (arrow) are common on vehicles built in the last 20 years to increase the capacity of the system and allow for expansion and contraction of the coolant as it heats up and cools down. However, if any part of the cooling passages in your engine are above the top of the radiator, you’ll need an expansion tank that’s mounted even higher to get all of the air out of the system. Trapped air in the system will cause overheating; just ask a Jeep XJ owner.