The system bleeds its self as it runs, the pump will eventually stop wining once the air is out of the lines.Let the van idle and turn the steering wheel full lock in each direction a couple time to move the fluid through out the system letting out any air.
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-- from the 1990-1999 Lumina / Silhouette / TranSport Repair manual ---
1992 Pontiac TransPort Power Steering Pump
REMOVAL AND INSTALLATION
Disconnect the negative battery cable.
Disconnect and cap the power steering pump hoses.
Remove the accessory drive belt.
Remove the power steering pump pulley using a suitable puller tool.
Remove the pump mounting bolts and remove the pump from the vehicle.
See Figures 1, 2 and 3
Fig. Fig. 1: On some vehicles, you must use a puller to remove the power steering pump pulley
Fig. Fig. 2: Power steering pump mounting-early model vehicle shown
Fig. Fig. 3: Power steering pump mounting-late model vehicle shown
Installation is the reverse of the removal procedure. Tighten the pump mounting bolts to 18 ft. lbs. (25 Nm).
Bleed the power steering system to remove trapped air. Air in the system could cause noise and or damage to the pump.
This procedure requires the help of an assistant.
With the engine OFF, the wheels off the ground and turned all the
way to the left, fill the fluid reservoir to the FULL COLD mark on the
fluid level indicator.
With an assistant checking the fluid level and condition, bleed
the system by turning the wheels from side to side without hitting the
stops. You should repeat this at least 20 times, making sure to keep the
fluid level at the FULL COLD mark.
Fluid with air in it has a light tan appearance. This air must be
eliminated from the fluid before normal steering action can be obtained.
See Figure 4
Fig. Fig. 4: Power steering bleeding procedure
Start the engine, and while it is idling, recheck the fluid level and add as necessary to reach the FULL COLD mark.
Return the wheels to the center position. Lower the front wheels
to the ground and continue running the engine for 2 or 3 minutes.
Road test the vehicle to make sure the steering functions properly and is free of noises.
bleed your brakes you possibly have air in the system, but instead of just bleeding one, bleed them all flush the old fluid out, make sure that when your bleeding your have a good eye one the resivoir to ensure that it doesnt get low, if it does and sucks air, youll have to do the process again. ideally youll need three people to do this correctly. person #1 to pump and hold the brakes. person #2 to monitor and add fluid to the resivoir, person #3 to bleed each brake. remember to bleed the brakes only after the person has pumped them up 10 full pushes of the brake, and then on push 11 hold the brake. then this is the time you would crack the valve to bleed the brake. the person in the driver seat will notice the brake goes to the floor. thats when you close the valve and do this again (pumping them up, holding , and then bleeding them), this is when the person monitoring the resivior will be adding more fluid. id do this to each brake 3 times to ensure all the air is out.
Hi You don't actually have to bleed a power steering system as such, its not like a brake system. If the fluid bottle was empty and you refilled it, or you have replace the steering pump then it's only a simple operation.
Ensure that the power steering fluid is topped up.
Start the engine.
Turn the steering wheel to full lock in one direction until you hear a hissing type sound which is the relief valve.
Then do the same as #3 in the opposite direction.
Do this about 3 - 5 times per side.
The hissing sound should get quieter as the fluid gets around the system
Recheck fluid level.
The power steer system should operate as normal after doing the above.Hope this has helped, let me know how you get on.