Hummer H2. Manual - part 2406

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J 35944-A Transmission Oil Cooler Flusher  

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J 35944-22 Transmission Oil Cooler Flushing Fluid  

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J 35944-200 Cooler Flushing Adapter  

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Measuring cup  

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Funnel  

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Water supply, hot water recommended  

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Water hose, at least 16 mm (5/8 in) ID  

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Shop air supply, with water/oil filters, regulator and pressure gauge  

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Air chuck, with clip if available  

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Oil drain container  

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Pail with lid 19 L (5 gallon)  

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Eye protection  

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Rubber gloves  

Preparation 

1. During the installation of the repaired or replacement transmission, do not connect the oil cooler pipes. 

 

2004 Hummer H2 

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

  

Fig. 24: J 35944 Flusher Tank 
Courtesy of GENERAL MOTORS CORP. 

2. Remove the fill cap (9) on the J 35944-A and fill the flusher tank (4) with 0.6 L (20-21 oz) of J 35944-

22 , using the measuring cup (6). Do not overfill.  

3. Install the fill cap (9) on the J 35944-A and pressurize the flusher tank (4) to 550-700 kPa (80-100 psi), 

NOTE:

Do not use solutions that contain alcohol or glycol. Use of solutions that 
contain alcohol or glycol may damage the oil cooler line flusher, oil cooler 
components and/or transmission components.

IMPORTANT: The J 35944-22 is environmentally safe, yet powerful enough to cut 

through transmission fluid to dislodge any contaminants from the cooler. 
The safety precautions on the label, regarding potential skin and eye 
irritations associated with prolonged exposure, are typical precautions 
that apply to many similar cleaning solutions. It should be noted that 
according to GM, use of other non-approved fluids for cooler flushing can 
have an adverse reaction to the seals inside the transmission.

 

2004 Hummer H2 

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

  

using the shop air supply at the tank air valve (2). 

4. With the water supply valve (1) on the J 35944-A in the OFF position, connect the water supply hose 

from the J 35944-A to the water supply at the faucet.  

5. Turn ON the water supply at the faucet.  

Back Flush 

1. Inspect the transmission oil cooler pipes for kinks or damage. Repair as necessary. 

Fig. 25: Flushing Oil Cooler & Lines 
Courtesy of GENERAL MOTORS CORP. 

2. Connect the J 35944-A to the oil cooler feed bottom connector. Use the J 35944-200 , if required.  

3. Clip the discharge hose (2) onto the oil drain container. 

 

2004 Hummer H2 

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

  

4. Attach the J 35944-A to the undercarriage of the vehicle with the hook provided and connect the flushing 

system feed supply hose (1) from the J 35944-A to the top connector oil cooler return pipe. Use the J 
35944-200 , if required.  

5. Turn the J 35944-A water supply valve (3) to the ON position and allow water to flow through the oil 

cooler and pipes for 10 seconds to remove any remaining transmission fluid. If water does not flow 
through the oil cooler and pipes, the cause of the blockage must be diagnosed and the plugged component 
must be repaired or replaced. Continue with the cooler flushing and flow check procedure once the 
blockage is corrected.  

6. Turn the J 35944-A water supply valve (3) to the OFF position and clip the discharge hose onto a 19 liter 

(5 gallon) pail with a lid, to avoid splashback. 

Fig. 26: Turning J 35944-A Water Supply Valve To ON Position

 

2004 Hummer H2 

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