Chevrolet Silverado / GMC Sierra. Manual - part 745
Fig. 15: Identifying Transmission Oil Cooler Supply And Return Lines
Courtesy of GENERAL MOTORS CORP.
1. Connect the J 45096-30 (1) to the vehicle transmission oil cooler supply and return lines at
the transmission. See Special Tools.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
Fig. 16: Identifying Black Supply Hose & Clear Waste Hose
Courtesy of GENERAL MOTORS CORP.
2. Connect the black supply hose (1) to the return line, top connector of the transmission, and
the clear waste hose (2) to the feed line, bottom connector of the transmission, to the vehicle
cooler lines. This is the reverse flow - backflush direction.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
Fig. 17: 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 - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
Fig. 18: 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 - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado