Thread: 2007 Grand Prix GXP Steering stiffen warm help needed

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  1. #1 2007 Grand Prix GXP Steering stiffen warm help needed 
    SE Level Member Cbierniat24's Avatar
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    07 GP GXP losing power steering once warm at stand still/idle parking speed. Pump, rack, or ABS module?


    6K miles prior to current issue I replaced/serviced:
    Abs module was rebuilt due to internal malfunction. Fixed dash lights.


    Replaced OEM 250K rack and low/high lines due to leaks and rack wander. Low pressure line did not include a finned cooler. Leaks eliminated and steering restored with no dash lights. Resolved steering angle sensor code too.


    6 months after I replaced the rack, the operating temp stiff steering issue happened. Removed reservoir and cleaned out screen with brake cleaner. Also replaced hose reservoir to pump- Same issue


    Replaced OEM 255k power steering pump with reman- Same issue


    Replaced rack again due to rack whine and clunk- Same issue

    Fluid was flushed from return line and bled with tires in the air engine off and engine on everytime.


    Could the lack of a cooler on low pressure line cause the issue?
    Could a defective rebuilt ABS module cause the issue and not throw codes?
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  2. #2 Re: 2007 Grand Prix GXP Steering stiffen warm help needed 
    GrandPrix Junkie
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    The ABS shouldn't cause you to loose power assist. When you replaced everything did you bleed the air out of the system? This sounds like a bad pump to me.

    If you 2-foot it (brake and gas pedals) and raise the RPM's a bit when parking does the assist come back?
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  3. #3 Re: 2007 Grand Prix GXP Steering stiffen warm help needed 
    SE Level Member Cbierniat24's Avatar
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    Fluid was bled the old fashion way. No vacuum pump.

    I will try what you mentioned and update Sunday. It is not my car.

    Saturday its getting a new radiator, hoses, and Tstat. Im also adding a PS and transmission cooler.
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