Hummer H2. Manual - part 2461

Fig. 17: Turning 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 

 

2004 Hummer H2 

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

  

Fig. 18: Disconnecting Supply & Waste Hoses From Vehicle Cooler Lines 
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. 

 

2004 Hummer H2 

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

  

Fig. 19: Turning 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 

 

2004 Hummer H2 

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

  

Fig. 20: Turning Main Function Switch To FLOW Position 
Courtesy of GENERAL MOTORS CORP. 

1. Turn the main function switch to the FLOW position and allow the oil to flow for 15 seconds. Observe 

and note the flow rate. This is the TESTED flow rate.  

2. Compare the TESTED flow rate to the MINIMUM flow rate information previously recorded. 

z

If the TESTED flow rate is equal to or greater than the MINIMUM flow rate recorded, the oil 
cooling system is functioning properly. Perform Code Recording Procedure.  

z

If the TESTED flow rate is less than the MINIMUM flow rate previously recorded, repeat the back 
flush and forward flush procedures.  

3. If the TESTED flow rate is less than the MINIMUM flow rate after the second test, perform the Code 

Recording Procedure. 

IMPORTANT: If the flow rate is less than 0.5 gpm, the LCD displays an error message. 

Refer to the Troubleshooting section of the operation manual.

 

2004 Hummer H2 

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