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An auto trans oil cooler, shorter for automatic transmission oil cooler, is like a small radiator that is used to cool off the auto trans fluid for an optimal transmission temperature. It reduces the oil temperature when passing through the cooler, thus keeping the transmission running cool. An auto trans oil cooler is also used for hauling and towing purposes. A malfunctioning auto trans oil cooler may cause the transmission to overheat which will result in poor vehicle performance. Auto Parts Network provides high quality automotive parts to maintain your vehicle’s excellent operating condition.