Hummer H3. Manual — part 730

2. Record TESTED flow rate, temperature, cycle and seven-character flow code information

on the repair order.

Clean-Up

IMPORTANT:

If power is interrupted prior to the recording of the 7-
character code, the code will be lost and the flow rate
test will need to be repeated.

The flow test must run for a minimum of 8-10 seconds
and be above 0.5 gpm for a code to be generated.

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

Fig. 21: View Of Main Power Switch & Main Function Switch
Courtesy of GENERAL MOTORS CORP.

1. Turn the main function switch to the IDLE position and allow the supply vessel pressure to

dissipate.

2. Turn the main power switch to the OFF position.

IMPORTANT: A small amount of water may drain from the bottom of the

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

3. Disconnect the supply and waste hoses and the 12-volt power source from the vehicle.

Fig. 22: Applying Shop Air Supply Hose To Quick-Disconnect
Courtesy of GENERAL MOTORS CORP.

4. Disconnect the air supply hose from J 45096 . See Special Tools.

5. Dispose of the waste oil in accordance with all applicable federal, state and local

requirements.

TRANSMISSION FLUID COOLER FLUSHING AND FLOW TEST (J 35944-A)

GM studies indicate that plugged or restricted transmission oil coolers and pipes cause
insufficient transmission lubrication and elevated operating temperatures which can lead to

unit when the air supply is disconnected. This is a normal
operation of the built-in water separator.

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

premature transmission wear-out. Many repeat repair cases could have been prevented by
following published procedures for transmission oil cooler flushing and flow checking. This
procedure includes flow checking and flushing the auxiliary transmission oil cooler, if equipped.

Only GM Goodwrench DEXRON®VI automatic transmission fluid should be used when doing a
repair on a GM transmission.

Time allowance for performing the cooler flow checking and flushing procedure has been
included in the appropriate labor time guide operations since the 1987 model year. The service
procedure steps for oil cooler flushing are as follows:

Cooler Flow Check and Flushing Steps

1. Tools Required

2. Preparation

3. Back Flush

IMPORTANT: Use the J 35944-A or equivalent to flush the transmission oil

cooler and the oil cooler pipes whenever the transaxle is
removed for the following repairs. See Special Tools.

Torque converter

Oil pump

Oil pump drive shaft

Drive sprocket support

Transaxle overhaul complete

Transaxle assembly replacement

IMPORTANT: Use the J 35944-A or equivalent to flush the transmission oil

cooler and the oil cooler pipes whenever the transmission is
removed for the following repairs. See Special Tools.

Torque converter

Oil pump

Turbine shaft

Transmission overhaul complete

Transmission assembly replacement

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3