AutoZone 2006 Lexus Truck GX470 4.7L SFI DOHC 8cyl | Repair Guides | Steering | Power Steering Pump | Filling & Bleeding | AutoZone.com

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    2006 Lexus Truck GX470 4.7L SFI DOHC 8cyl

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    GrandPrix, Impala 2006-2008, Monte Carlo 2006-2007

    Filling & Bleeding

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    The power steering fluid replacement procedure is a two-stage process: first, flushing the old fluid from the system with new fluid and second, bleeding the system to remove any trapped air. The following sequences outline these procedures.

    1. Raise and safely support the front end of the vehicle off the ground until the front wheels are free to turn.
    2.  
    3. Remove the fluid return line at the pump reservoir inlet connector.
    4.  
    5. Plug the inlet connector port on the pump reservoir.
    6.  
    7. Position the fluid return line toward a container (several quart capacity) to catch the draining fluid.
    8.  
    9. When an assistant fills the reservoir with either the standard power steering fluid or optional cold weather power steering fluid, start and run the engine at idle.
    10.  
    11. Turn the steering wheel from stop-to-stop.
      WARNING
      Do not hold the steering wheel against the stops while flushing the system. Holding the steering wheel against the stops will cause high system pressure, overheating and damage to the pump and/or the steering gear assembly.

    12.  
    13. Continue draining until all of the old fluid is cleared from the power steering system. The addition of another quart of fresh fluid will be required to flush the system.
    14.  
    15. Turn the engine OFF . Unplug the pump reservoir inlet and reconnect the return line.
    16.  
    17. Fill the reservoir to the FULL COLD mark.

      Click image to see an enlarged view

      Fig. Power steering system bleeding

    18.  

    After replacing the fluid or servicing the power steering hydraulic system, you must bleed air from the system. Air in the system prevents an accurate fluid level reading, causes pump cavitation noise and over time could damage the pump. To bleed the power steering system, proceed as follows.

    1. Begin with the engine OFF , front wheels off the ground and the wheels turned all the way to the left.
    2.  
    3. Add either standard power steering fluid or optional cold climate fluid to the FULL COLD mark on the fluid level indicator.
    4.  
    5. With the engine still OFF , bleed the system by turning the wheels from stop-to-stop, but without hitting the stops.
      NOTE
      This may require turning the wheels from side to side up to 40 times. Keep the fluid level at the FULL COLD mark. Fluid with air in it may have a light tan appearance. This air must be eliminated from the fluid before normal steering action can be obtained.

    6.  
    7. Start the engine. With the engine idling, recheck the fluid level. If necessary, add fluid to bring the level to the FULL COLD mark.
    8.  
    9. Return the front wheels to the center position. Verify that the transaxle is in PARK and that the parking brake had been firmly set. Lower the front wheels to the ground. Continue running the engine for two or three minutes.
    10.  
    11. Test drive the vehicle to be sure the power steering functions normally and is free from noise.
      NOTE
      Inspect for fluid leakage at the connection points along the power steering system.

    12.  
    13. Recheck the fluid level. The fluid level should now be up to the FULL HOT mark after the system has stabilized at operating temperature.
    14.  

     
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