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Home >> Lincoln >> 2018 >> MKZ Select, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 23 (Transmission Cooling - 6-Speed Automatic Transmission - 6F50/6F55 (Except Hybrid)) >> Description And Operation >> Transmission Cooling - Overview

Transmission Cooling - Overview

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This vehicle is equipped with a transmission fluid warmer mounted on top of the transmission and an oil-to-air fluid cooler which is mounted on the lower LH side of the vehicle behind the front bumper cover. The cooling system also consists of a cooler bypass valve which is mounted on the rear of the transmission. When the transmission fluid is below normal operating temperature, transmission fluid travels from the transmission to the warmer which uses warm engine coolant to warm the transmission fluid. The transmission fluid then travels to the cooler bypass valve and back to the transmission. When the transmission fluid is at or above normal operating temperature, a valve located in the engine cooling circuit closes, stopping coolant flow to the transmission fluid warmer. The cooler bypass valve opens allowing transmission fluid to travel from the transmission through the cooler and back to the transmission. The transmission fluid cooler transfers heat from the transmission fluid to the ambient air.