Forward Flush
WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
 Courtesy of GENERAL MOTORS COMPANY
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Disconnect the supply and waste hoses from the vehicle cooler lines. Reverse the supply and waste hoses to provide a normal flow direction.
 Courtesy of GENERAL MOTORS COMPANY
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Turn the main function switch to the FLUSH position and allow machine to operate for 30 seconds.