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Chevrolet Silverado / GMC Sierra. Manual - part 1022
Fig. 15: Setting Main Function Switch To FLUSH Position
Courtesy of GENERAL MOTORS CORP.
3. Turn the main function switch to the FLUSH position. Allow the machine to operate for 30
seconds.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
Fig. 16: Setting Main Function Switch To IDLE Position
Courtesy of GENERAL MOTORS CORP.
4. Turn the main function switch to the IDLE position and allow the supply vessel pressure to
dissipate.
FORWARD FLUSH
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
Fig. 17: Identifying Black Supply Hose And Clear Waste Hose
Courtesy of GENERAL MOTORS CORP.
1. Disconnect the supply and waste hoses from the vehicle cooler lines. Reverse the supply and
waste hoses to provide a normal flow direction.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
Fig. 18: Setting Main Function Switch To FLUSH Position
Courtesy of GENERAL MOTORS CORP.
2. Turn the main function switch to the FLUSH position and allow the machine to operate for
30 seconds.
FLOW TEST
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
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