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A surge tank is basically a pressurized coolant reservoir. As your engine heats and cools the coolant expands and contracts. Because of this You need a place for extra coolant to go to when it expands and be drawn from when it contracts. Conventionally the recovery tank or reservoir was not pressurized. A tube from the radiator cap allowed coolant to be sucked and drained in to the reservoir. However, on many newer vehicles like yours the reservoir is pressurized and called a surge tank.

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16y ago

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