GM Service Manual Online
For 1990-2009 cars only

The purpose of these procedures is to pinpoint the location of the leak. In some cases, the leak can be located easily. Seepage-type leaks may be more difficult to locate. Use the following method to locate seepage leaks:

  1. With the engine OFF, wipe the power steering system dry.
  2. Check the power steering fluid level. Add power steering fluid if necesary. Refer to Checking and Adding Power Steering Fluid
  3. Start the engine.
  4. Have someone else turn the steering wheel from stop to stop several times. Do not hold the steering wheel in a stop position for any length of time or damage to the power steering pump could result.
  5. Locate the power steering fluid seepage leak.
  6. Repair the power steering fluid leak.

Power Steering Gear Leak Diagnosis


    Object Number: 65367  Size: SH
  1. Tighten the fittings (1) to 27 N·m (20 lb ft). Replace the O-ring seals (1) if leakage persists.
  2. Replace the dust and stub seals (2).
  3. Replace partial gear assembly if leakage is observed between torsion bar and stub shaft (3).
  4. Replace partial gear assembly if leakage is observed at the driver side (4) and is not affected by the direction of turn.
  5. Replace partial gear assembly if leakage is observed at the housing end (5) and spurts when bottomed in left turn.
  6. Replace partial gear assembly if leakage is observed at these points (6).

Power Steering Pump Leak Diagnosis


    Object Number: 65368  Size: SH
  1. Replace drive shaft seal (5). Ensure that the driveshaft is clean and free of pitting or grooves in seal contact area.
  2. Seat ball in the housing with blunt punch (4).
  3. Tighten fitting (3) to 75N·m (55 lb ft). Replace O-ring seal (3) if leakage persists.
  4. Tighten hose fitting (2) nut to 27N·m (20 lb ft). If leakage persists replace O-ring seal (2).
  5. Replace the O-ring seal if leakage persists (1).
  6. Replace the O-ring seal (6).