98 LeSabre; Bleed steering; need vacuum pump? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-23-2007, 12:22 PM   #1
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Default 98 LeSabre; Bleed steering; need vacuum pump?

98 LeSabre. Has MagnaSteer, if that is relevant.

Considering draining power steering reservoir and replacing fluid, as it is starting to discolor (88.5k miles).

FSM says I need a vacuum pump (and reservoir cap with fitting) to bleed air out of system; however, posts I have read on this forum say just to put the front end on jacks and turn wheels back and forth while running for 5-10 minutes.

So, will I really need a vacuum pump and cap?
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Old 01-24-2007, 11:15 AM   #2
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This is from information on a '98 Buick Regal, but it should work for you....

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 wheels turned all the way to the left.
2. Add either standard power steering fluid or optional cold climate fluid, to the "FULL COLD" mark on the fluid level indicator.
3. Bleed the system by turning the wheels from stop-to-stop, but without hitting the stops. Important: 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 has a light tan appearance. This air must be eliminated from the fluid before normal steering action can be obtained.
4. Start the engine. With the engine idling, recheck the fluid level. If necessary, add fluid to bring the level to the "FULL COLD" mark.
5. Return the wheels to the center position. Lower front wheels to the ground. Continue running the engine for two or three minutes.
6. Test the vehicle to be sure the steering functions normally and is free from noise. Important: Inspect for fluid leakage at connection points along the power steering system.
7. Recheck the fluid level as described in Steps 3 and 4 except that the fluid level should now be up to the "FULL HOT" mark after the system has stabilized at its normal operating temperature.
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