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12: Accessory drive component brackets that are bent, cracked or loose may put extra strain Drive Belt Rumbling and Vibration Diagnosis Step Action Yes No DEFINITION: The following items are indications of drive belt rumbling: A low pitch tapping, knocking or thumping noise heard at or just above idle. Heard once per revolution of the drive belt or a pulley. Rumbling may be caused from: Pilling, the accumulation of rubber dust that forms small balls (pills) or strings in The separation of the drive belt A damaged drive belt DEFINITION: The following items are indications of drive belt vibration: The vibration is engine-speed related. The vibration may be sensitive to accessory load. NOTE: Refer to Belt Dressing Notice . 1 Did you review the Drive Belt Symptom Go to Step 2 Go to 2 Verify that there is a rumbling noise or Go to Step 3 Go to Diagnostic 3 1. Remove the drive belt. If the engine has multiple drive belts, 2. Operate the engine for no longer Go to
2007 Hummer H3 2007 ENGINE Engine Mechanical - 3.7L - H3
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