Hummer H2. Manual - part 1703

Drive Belt Excessive Wear Diagnosis 

DRIVE BELT TENSIONER DIAGNOSIS 

Inspection Procedure 

Step

Action

Yes

No

DEFINITION: Wear at the outside ribs of the drive belt(s) due to incorrect installation of the drive belt
(s).

NOTE:

Refer to Belt Dressing Notice in Cautions and Notices.

1

Did you review the Symptoms - Engine Mechanical diagnostic 
information, and perform the necessary inspections?

Go to 

Step 2

Go to Symptoms - 

Engine Mechanical

2

Inspect the drive belt(s) for proper installation. 
Is the drive belt(s) installed properly?

Go to 

Step 5

Go to Step 3

3

Inspect for the correct drive belt(s). 
Is the correct drive belt installed?

Go to 

Step 5

Go to Step 4

4

Inspect the drive belt(s) for signs of rubbing against a bracket, 
hose, or wiring harness. 
Was the drive belt(s) rubbing against anything?

Go to 

Step 5

Go to Diagnostic Aids

5

Replace the drive belt(s). Refer to Drive Belt Replacement - 
Accessory or Drive Belt Replacement - Air Conditioning . 
Did you complete the replacement?

Go to 

Step 6

-

6

Run the engine in order to verify the repair. 
Is there still excessive drive belt wear?

-

System OK

 

2004 Hummer H2 

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

  

Fig. 20: Drive Belt Movement Direction 
Courtesy of GENERAL MOTORS CORP. 

NOTE:

Allowing the drive belt tensioner to snap into the free position may result 
in damage to the tensioner.

 

2004 Hummer H2 

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

  

1. Remove the drive belt. Refer to Drive Belt Replacement - Accessory or Drive Belt Replacement - Air 

Conditioning .  

2. Move the drive belt tensioner through its full travel. 

z

The movement should feel smooth.  

z

There should be no binding.  

z

The tensioner should return freely.  

3. If any binding is observed, replace the drive belt tensioner. Refer to Drive Belt Tensioner Replacement 

- Accessory or Drive Belt Tensioner Replacement - Air Conditioning .  

4. Install the drive belt. Refer to of Drive Belt Replacement - Accessory or Drive Belt Replacement - Air 

Conditioning .  

REPAIR INSTRUCTIONS 

DRIVE BELT REPLACEMENT - ACCESSORY 

Removal Procedure 

IMPORTANT: When the engine is operating the drive belt tensioner arm will move. Do 

not replace the drive belt tensioner because of movement in the drive belt 
tensioner arm.

 

2004 Hummer H2 

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

  

Fig. 21: Air Cleaner Outlet Duct 
Courtesy of GENERAL MOTORS CORP. 

1. Loosen the air cleaner outlet duct clamps at the following locations: 

z

Throttle body  

z

Mass airflow/intake air temperature (MAF/IAT) sensor  

2. Remove the air cleaner outlet duct. 

 

2004 Hummer H2 

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2