02 STS loses power steering when stopped
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  • 1 Post By carmaster
Cadillac Seville / Cadillac Eldorado Forum Discussion, 02 STS loses power steering when stopped in Past Cadillac Vehicle Discussion; Just as it says, when I come to a stop to parallel park, turn into a parking space or at ...
  1. #1
    carmaster is offline Cadillac Owners Fanatic
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    02 STS loses power steering when stopped

    Just as it says, when I come to a stop to parallel park, turn into a parking space or at the drive through, I loose power steering but as soon as I gain any momentum it comes right back. Other than that the steering is flawless. I saw in the receipts in the glove box from the previous owner they had the pump replaced so I'm guessing they probably had the same problem. When I checked out the tech bulletins on Mitchell the only thing I see if there's a moaning / whining at low speed replace the inlet cooling hose. I'm thinking of replacing the serpentine belt to see if that's slipping, but the belt looks fine.

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  3. #2
    rodnok01's Avatar
    rodnok01 is online now Cadillac Owners Connoisseur
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    You'd hear the belt slipping and if anything reving engine it would be louder.
    Have you checked for codes?

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 02 STS looses power steering when stopped

    Have you checked the P/S fluid level?

  5. #4
    carmaster is offline Cadillac Owners Fanatic
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    Re: 02 STS looses power steering when stopped

    no codes relating to that and the fluid level is where it should be. Its been happening in since I've owned the car; roughly 18 months.

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    Should I try swapping the fluid out, and adding a conditioner or additive from Wynns or the such? The car runs awesome besides that, and I regularly drive it very aggressive....:-)

  6. #5
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    Additives are a complete waste of money. Your symptoms are typical if a weak pump. What brand was the replacement?

  7. #6
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    Submariner409 is offline If it won't run, chrome it
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    Re: 02 STS loses power steering when stopped

    ...... also, these cars have variable assist steering - supposed to tighten up steering effort as vehicle speed increases, but .......... Use the car's built-in diagnostic system to find any stored codes. There might be a steering system code in there.

  8. #7
    carmaster is offline Cadillac Owners Fanatic
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    Re: 02 STS loses power steering when stopped

    I ran all the codes about a week ago when my check engine light came on. It was a evap leak (small), possibly had to do with my oil fill cap being not on all the way.(hasn't come on since, about 400 miles). The rest of the codes were related to the drivers power seat(weird), top speed cut off and power lose since I hooked up an amplifier up and had to disconnect my battery.

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    Not sure brand of pump, I never investigated the pump thoroughly to figure that out. Before I replace the pump which sounds easy, only 1.3 hours, any other suggestions?

  9. #8
    Ranger's Avatar
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    Re: 02 STS looses power steering when stopped

    Quote Originally Posted by carmaster View Post
    Should I try swapping the fluid out, and adding a conditioner or additive from Wynns or the such?
    No snake oil.

    Probably a failing (weak) pump as mentioned.

  10. #9
    carmaster is offline Cadillac Owners Fanatic
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    Re: 02 STS loses power steering when stopped

    Considering the pump is really cheap from Napa I'll try that out. I'll let everyone know the results as long as it's in stock. Any brands of remans I should stay away from, or should they all be comprable? Since reman is all I see available.

  11. #10
    Ranger's Avatar
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    Re: 02 STS loses power steering when stopped

    Just stay out of AutoZone.

  12. #11
    carmaster is offline Cadillac Owners Fanatic
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    Re: 02 STS loses power steering when stopped

    hahaha, autozone is where I'd go if I was in the desert and they were they only thing available for 100 miles; the same with advanced. Plus I should have said this earlier, but it only happens when the car is at operating temperature, not when first started. But a crappy pump would only work when cold as well most likely.

  13. #12
    carmaster is offline Cadillac Owners Fanatic
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    Re: 02 STS loses power steering when stopped

    Just wanted to give an update, after 3 or so weeks after I replaced the pump the problem has been fixed. Plus it was really easy to swap out the pump, the biggest head ache was swapping the reservoir. But the fix took under an hour.
    bwv565 likes this.

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