Chevrolet Silverado / GMC Sierra. Manual - part 240
DRIVE BELT TENSIONER DIAGNOSIS
Inspection Procedure
2. Replace improper or missing fasteners.
Does the drive belt continue to fall off?
Go to Step 9
System OK
9
Test the drive belt tensioner for operating
correctly. Refer to Drive Belt Tensioner
Diagnosis.
Does the drive belt tensioner operate correctly? Go to Step 11
Go to Step 10
10
Replace the drive belt tensioner. Refer to Drive
Belt Tensioner Replacement - Accessory or
Drive Belt Tensioner Replacement - Air
Conditioning.
Does the drive belt continue to fall off?
Go to Step 11
System OK
11
Inspect for failed drive belt idler and drive belt
tensioner pulley bearings.
Did you find and repair the condition?
Go to Step 12
Go to Diagnostic
Aids
12
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 2
13
Inspect the drive belt for the proper installation.
Refer to Drive Belt Replacement - Accessory
or Air Conditioning Compressor Belt
Replacement.
Did you find this condition?
Go to Step 16
Go to Step 14
14
Inspect for the proper drive belt.
Did you find this condition?
Go to Step 16
Go to Step 15
15
Inspect for the drive belt rubbing against a
bracket, hose, or wiring harness.
Did you find and repair the condition?
Go to Step 17
Go to Diagnostic
Aids
16
Replace the drive belt. Refer to Drive Belt
Replacement - Accessory or Air
Conditioning Compressor Belt
Replacement.
Did you complete the replacement?
Go to Step 17
-
17
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
-
2008 Hummer H2
2008 ENGINE Engine Mechanical - 6.2L - H2
Fig. 19: Releasing Drive Belt Tension
Courtesy of GENERAL MOTORS CORP.
NOTE:
Allowing the drive belt tensioner to snap into the free position
may result in damage to the tensioner.
2008 Hummer H2
2008 ENGINE Engine Mechanical - 6.2L - H2
1. Remove the drive belt. Refer to Drive Belt Replacement - Accessory or Air
Conditioning Compressor Belt Replacement.
2. Move the drive belt tensioner through its full travel.
The movement should feel smooth.
There should be no binding.
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 Air
Conditioning Compressor Belt Replacement.
REPAIR INSTRUCTIONS - ON VEHICLE
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.
2008 Hummer H2
2008 ENGINE Engine Mechanical - 6.2L - H2
Fig. 20: MAF/IAT Sensor & Air Cleaner Assembly
Courtesy of GENERAL MOTORS CORP.
1. Loosen the air cleaner outlet duct clamps at the following locations:
Throttle body
Mass airflow/intake air temperature (MAF/IAT) sensor
2008 Hummer H2
2008 ENGINE Engine Mechanical - 6.2L - H2