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Home >> Chevrolet >> 2002 >> Astro Van Passenger, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 520 (Suspension System General Diagnosis) >> Diagnostic Information >> Noise Diagnosis - Rear Suspension

Noise Diagnosis - Rear Suspension

WARNING: This page is about a different car, the 2003 GMC Safari and 2003 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Any noise from the rear of the vehicle that is induced by Vehicle Speed or Driving Terrain as related to the rear suspension.
NOTE: Required Tools: Chassis Ear (J-39570).
  1. Did you review the General Description and perform the necessary inspections? If so, go to next step. If not, go to SYMPTOMS - SUSPENSION GENERAL DIAGNOSIS .
  2. Attempt to duplicate the condition. Road test the vehicle. Did you duplicate the condition? If so, go to next step. If not, then system is okay.
  3. Is the noise reactive to vehicle load or speed? If so, go to next step. If not, go to step  6.
  4. Perform the following Inspections:
    • Inspect and adjust the tire Inflation.
    • Inspect for unusual tire wear.
    • Inspect the wheel nuts for looseness.
    Did you find and correct the condition? If so, go to step  10. If not, go to next step.
  5. Inspect the rear axle for noise. Repair as necessary. See SYMPTOMS - REAR DRIVE AXLE in REAR DRIVE AXLE . Did you find and correct the condition? If so, go to step  10. If not, go to next step.
  6. Bounce the rear of the vehicle in order to duplicate the noise. Did you duplicate the noise? If so, go to next step. If not, go to step  9.
  7. Raise the vehicle. Inspect the rear suspension components for looseness and tighten as necessary. Refer to FASTENER TIGHTENING SPECIFICATIONS . Inspect the rear suspension components for damage and repair as necessary. Did you find and correct the condition? If so, go to step  10. If not, go to next step.
  8. Inspect the rear shock absorbers. See STRUTS OR SHOCK ABSORBERS ON-VEHICLE TESTING . Did you find and correct the condition? If so, go to step  10. If not, go to next step.
  9. Install the J 39570 Chassis Ear or equivalent. Bounce the rear of the vehicle. Use the J 39570 Chassis Ear or equivalent in order to locate the source of the noise. If necessary, road test the vehicle. Repair as necessary. Did you find and correct the condition? If so, go to next step. If not, then system is okay.
  10. Operate the system in order to verify the repair. Did you correct the condition? If so, then system is okay. If not, go to step  3.
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