Purging

Power Steering System Purging





Special Tool(s)

NOTE: If the air is not purged from the power steering system correctly, pump failure can result. This condition can occur on pre-delivery vehicles with evidence of aerated fluid or on vehicles that have had steering component repairs.

A whine heard from the power steering pump may be caused by air in the system. The power steering purging procedure must be carried out under the following conditions:
^ Prior to any component repair for which power steering noise complaints are accompanied by evidence of aerated fluid.
^ After replacement of any power steering system component (gear, hose, etc.).
1. Remove the reservoir cap and check the fluid.
2. Raise the front wheels off the floor.





3. Install the special tools.





4. Apply and maintain maximum vacuum.
5. Cycle the steering wheel fully to the left and right 10 times.
6. Release the vacuum source and remove the vacuum pump.





7. Add fluid to the power steering fluid reservoir.
8. Start the engine.





9. Reinstall the vacuum pump. Apply and maintain maximum vacuum.

10. CAUTION: Do not hold the steering wheel against the stops for more than three to five seconds at a time. Damage to the power steering pump will occur.

Cycle the~steering wheel fully to the left and right lit times.
11. Stop the engine, release the vacuum, and remove the vacuum pump.
12. Lower the vehicle.





13. Add power steering fluid if necessary. Install the power steering fluid reservoir cap.
14. Check for power steering fluid leaks at all connections. If the power steering fluid still shows signs of aeration, repeat this procedure.