Hummer H2. Manual - part 2613

z

In hilly or mountainous terrain.  

z

When doing frequent trailer towing.  

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Uses such as found in taxi, police or delivery service.  

CHECKING FLUID LEVEL & CONDITION 

Checking Fluid Level 

1. Start the engine and operate the vehicle for 15 minutes or until the transmission fluid reaches an operating 

temperature of 180-200°F (82-93°C).  

2. Park the vehicle on a level surface.  

3. With your foot on the brake, move the shift lever through each gear range. Pause for about 3 seconds in 

each range, ending in Park.  

4. Apply the Parking brake and let the engine idle for 3 minutes.  

5. Remove the transmission fluid level indicator. Wipe the indicator clean. Insert the indicator. Give the 

indicator a full twist in order to close.  

6. Wait 3 seconds and remove the indicator.  

7. Read both sides of the indicator. The fluid must be within the hot cross hatched area using the lowest 

level reading.  

Checking Fluid Condition 

1. Check the fluid color. Is the fluid Red in color? If so, go to step 5 . If not, go to next step.  

2. Is the fluid a non transparent Pink in color? If so, go to step 14 . If not, go to next step.  

3. Is the fluid a light Brown in color? If so, go to step 5 . If not, go to next step. 

4. Is the fluid Black in color and or have a burnt smell? If so, go to step 14 . If not, go to next step.  

5. Does the fluid appear as a solid liquid and not foamy or full of bubbles on transmission fluid level 

indicator? If so, go to next step. If not, go to step 7 .  

6. Check the fluid level. Proper level should be in middle of the "X" pattern, on transmission fluid level 

indicator. Is the level okay? If so, go to step 19 . If not, go to next step.  

7. Is the fluid level high on indicator? If so, go to step 12 . If not, go to next step.  

8. Is the fluid level low on indicator? If so, go to step 9 . If not, go to step 4 .  

9. Check for any external leak or leaks. Did you find an external leak or leaks? If so, go to next step. If not, 

go to step 11 .  

10. Correct leak or leaks as needed. Are any leak or leaks still present? If so, go to step 9 . If not, go to next 

step.  

11. Add fluid until level is in middle of "X" on the transmission fluid level indicator. Is the level okay? If so, 

go to step 19 . If not, go to step 6 .  

NOTE:

Fluid may turn a Dark Brown in color from normal use. This does not 
always indicate an oxidation or a contamination issue. 

 

2004 Hummer H2 

2003-04 AUTOMATIC TRANSMISSIONS Servicing - H2

  

12. Drain fluid until level is in middle of "X" pattern on the transmission fluid level indicator. Is level okay? 

If so, go to step 19 . If not, go to step 6 .  

13. Replace transmission oil cooler and flush lines. See AUXILIARY TRANSMISSION COOLER under 

REMOVAL & INSTALLATION. Is the replacement complete? If so, go to step 15 .  

14. Drain fluid and remove transmission oil pan to inspect. Is there sign or signs of internal component 

damage noted in bottom of transmission oil pan? If so, go to step 16 . If not go to step 13 . 

15. Replace the filter and fluid. See DRAINING & REFILLING . Is the replacement complete? If so, go to 

step 6 .  

16. Flush transmission oil cooler and lines, and check flow. See TRANSMISSION COOLER FLUSHING 

& FLOW CHECK . Is transmission oil cooler flushing and flow test complete? If so, go to step 17 .  

17. Overhaul transmission. See OVERHAUL article. Is the overhaul procedure complete? If so, go to next 

step.  

18. Fill transmission with appropriate fluid to proper level. See RECOMMENDED FLUIDS and FLUID 

CAPACITIES . Is the procedure complete? If so, go to step 6 .  

19. Check the fluid level and correct as necessary. Is the fluid level satisfactory? If so, system is okay. If not, 

go to step 1 .  

RECOMMENDED FLUIDS 

Manufacturer recommends Dexron-III ATF.  

FLUID CAPACITIES 

The following refill capacities given are approximate. Correct fluid level should always be determined by marks 
on dipstick, rather than amount of fluid added. DO NOT overfill. See TRANSMISSION FLUID 
CAPACITIES table.  

TRANSMISSION FLUID CAPACITIES 

DRAINING & REFILLING 

Draining & Cleaning 

NOTE:

A small amount of friction material in pan bottom is a normal condition, 
but large pieces and or metal particles will require complete transmission 
overhaul. 

Application 

Refill - Qts. (L) 

Dry Fill - Qts. (L) 

4L65-E 

5.0 (4.7) 

11 (10.6) 

CAUTION: When the transmission is at operating temperatures, take necessary 

precautions when removing the drain plug, to avoid being burned by 
draining fluid. 

 

2004 Hummer H2 

2003-04 AUTOMATIC TRANSMISSIONS Servicing - H2

  

1. Raise and support vehicle.  

2. Place a drain pan under the transmission oil pan.  

3. Remove transmission oil drain plug, if equipped.  

4. If necessary, remove the bolts and position aside the shift cable bracket for clearance while lowering the 

pan. It is not necessary to remove the cable from the lever or bracket.  

5. Remove the transmission oil pan bolts from the front and sides of the pan only.  

6. Loosen the rear transmission oil pan bolts approximately 4 turns.  

7. Lightly tap the transmission oil pan with a rubber mallet in order to loosen the pan to allow the fluid to 

drain.  

8. Remove the remaining transmission oil pan bolts. See Fig. 3 .  

9. Remove the transmission oil pan and the gasket. See Fig. 4 .  

10. Grasp the filter firmly while pulling down with a twisting motion in order to remove. See Fig. 5 .  

11. Remove and discard the filter seal. The filter seal may be stuck in the pump; if necessary, carefully use 

pliers or another suitable tool to remove the seal. See Fig. 6 .  

12. Inspect the fluid color.  

13. Inspect the filter. Pry the metal crimping away from the top of the filter and pull apart. The filter may 

contain clutch material, bronze slivers indicating bushing wear or steel particles.  

14. Clean the transmission case and the transmission oil pan gasket surfaces with solvent, and air dry. You 

must remove all traces of the old gasket material. 

 

2004 Hummer H2 

2003-04 AUTOMATIC TRANSMISSIONS Servicing - H2

  

Fig. 3: Removing Transmission Oil Pan Bolts 
Courtesy of GENERAL MOTORS CORP.

 

2004 Hummer H2 

2003-04 AUTOMATIC TRANSMISSIONS Servicing - H2