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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> Engine Mechanical >> Engine Mechanical - 4.3L >> Diagnostic Information and Procedures >> Drive Belt Rumbling Diagnosis >> Test Description

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 2. This test is to verify that the symptom is present during diagnosing. Other vehicle components may cause a similar symptom.
  2. 3. This test is to verify that the drive belt(s) is causing the rumbling noise. Rumbling noise may be confused with an internal engine noise due to the similarity in the description. Remove only one drive belt at a time if the vehicle has multiple drive belts. When removing the drive belt the water pump may not be operating and the engine may overheat. Also DTCs may set when the engine is operating with the drive belt removed.
  3. 4. Inspecting the drive belt(s) is to ensure that it is not causing a the noise. Small cracks across the ribs of the drive belt will not cause the noise. Belt separation is identified by the plys of the belt separating and may be seen at the edge of the belt our felt as a lump in the belt.
  4. 5. Small amounts of pilling is normal condition and acceptable. When the pilling is severe the drive belt does not have a smooth surface for correct operation.
    Fig 1: Diagnosis System Check - Drive Belt Rumbling
    G01643590Courtesy of GENERAL MOTORS CORP.
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