Hummer H2. Manual - part 2460

4. Inspect transmission oil cooler lines for damage or kinks that could cause restricted oil flow. Repair as 

needed and refer to the appropriate GM service manual procedures.  

Minimum Flow Rate in Gallons Per Minute (GPM) 

Back Flush Procedure 

Temperature Range

Steel

Aluminum

65-66°F

0.6 gpm

0.5 gpm

67-70°F

0.7 gpm

0.6 gpm

71-75°F

0.8 gpm

0.7 gpm

76-80°F

0.9 gpm

0.8 gpm

81-84°F

1.0 gpm

0.9 gpm

85-89°F

1.1 gpm

1.0 gpm

90-94°F

1.2 gpm

1.1 gpm

95-98°F

1.3 gpm

1.2 gpm

99-103°F

1.4 gpm

1.3 gpm

104-108°F

1.5 gpm

1.4 gpm

109-112°F

1.6 gpm

1.5 gpm

113-117°F

1.7 gpm

1.6 gpm

118-120°F

1.8 gpm

1.7 gpm

 

2004 Hummer H2 

2004 TRANSMISSION Automatic Transaxle - 4L60-E/4L65-E (Troubleshooting)

  

Fig. 14: Connecting J 45096 Adapters To Vehicle's Transmission Oil Cooler Supply & Return 
Lines 
Courtesy of GENERAL MOTORS CORP. 

1. Connect the J 45096 adapters (1) to the vehicle's transmission oil cooler supply and return lines at the 

transmission, may require J 35944-200 . 

 

2004 Hummer H2 

2004 TRANSMISSION Automatic Transaxle - 4L60-E/4L65-E (Troubleshooting)

  

Fig. 15: Connecting 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. 

 

2004 Hummer H2 

2004 TRANSMISSION Automatic Transaxle - 4L60-E/4L65-E (Troubleshooting)

  

Fig. 16: Turning 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. 

 

2004 Hummer H2 

2004 TRANSMISSION Automatic Transaxle - 4L60-E/4L65-E (Troubleshooting)