Rather uncomfortable whining - please help me figuring this out :)
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Rather uncomfortable whining - please help me figuring this out :) in Past Cadillac Vehicle Discussion; Hey guys, so this whining noise i have is getting more and more worse. It's not that present when the ...
  1. #1
    DReffects's Avatar
    DReffects is offline Cadillac Owners Fanatic
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    Thumbs down Rather uncomfortable whining - please help me figuring this out :)

    Hey guys,

    so this whining noise i have is getting more and more worse. It's not that present when the car is cold but after a few miles.... check out the video.
    I've replaced the alternator and a/c compressor recently.


    Is this the power steering pump?

    Thx!

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, install a sound system
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    Re: Rather uncomfortable whining - please help me figuring this out :)

    It's either the P/S pump or the alternator - and MANY high output alternators whine. Most common in police and emergency vehicles with their extra electrical loads.

    Disconnect the alternator, start the engine on the battery alone. Whine still there ?

  4. #3
    onecool is offline Cadillac Owners Fanatic
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    Yes I'm thinking Alternator also sounds a little more like a belt I noticed the alternator looks a little new or is it rebuilt? maybe its misaligned with the belt, sounds like a grinding belt.
    Take out the old belt look at it and see if it's worn anywhere put in a new one and see if it starts to wear maybe the alternator alignment? I'm not sure.

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    98eldo32v's Avatar
    98eldo32v is offline Cadillac Owners Connoisseur
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    Re: Rather uncomfortable whining - please help me figuring this out :)

    power steering....

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    DReffects's Avatar
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    Re: Rather uncomfortable whining - please help me figuring this out :)

    Alternator is new (~4 months old) as is the belt. The whine was present even before replacing the alternator.

    I'll perform the tests you recommended and check back with you

    I'f it's inconclusive, is there a 'hack' to verify it's the steering pump before replacing it? Like putting in some additive like lubguard... just to see if the condition changes a liiitle bit in order to verify it.

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    98eldo32v's Avatar
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    Re: Rather uncomfortable whining - please help me figuring this out :)

    The power steering pump isn't circulating the fluid, therefore the whine.

    If the pump isn't circulating the fluid, I really doubt if it's going to circulate anything else.

    Get a stethoscope, put on your ears and probe the pump.........

  8. #7
    DReffects's Avatar
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    Re: Rather uncomfortable whining - please help me figuring this out :)

    aye captn. I've did some reading on the power steering system. There seems to be an inline filter that -at least according to some websites- clogs while the pump is infact alright. Is this a common thing with the deville/fleetwood/60 special?

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    DReffects's Avatar
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    Re: Rather uncomfortable whining - please help me figuring this out :)

    So I took another look at the car today and noticed a small puddle of oil up on the throttle body directly behind the power steering reservoir. here's a picture:



    From the oils' consistency and smell it seems to be power steering oil. I've also noted that the reservoir is very greasy, as if some oil went out at the cap. Is this system under pressure?
    A oil level check revealed: during cold there are 0.20 inch of oil missing, when hot about 0.40 inch.

    Needless to say I need to find where the oil is leaking out. Any recommendations? Is it possible that the pump itself is still good and some kind of stop-leak can help me?

    Thanks!

  10. #9
    Mj2
    Mj2 is offline Cadillac Owners Member
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    When my baby did that whining it was a cracked intake manifold

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    Re: Rather uncomfortable whining - please help me figuring this out :)

    Quote Originally Posted by mj2 View Post
    when my baby did that whining it was a cracked intake manifold
    uhm

  12. #11
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    Re: Rather uncomfortable whining - please help me figuring this out :)

    That sound is NOT a vacuum leak. Definitely a spinning part. As 98eldo32v said, a stethoscope will pin point it. As Sub said, it almost has to be the alternator or the P/S pump.

  13. #12
    DReffects's Avatar
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    Re: Rather uncomfortable whining - please help me figuring this out :)

    Thanks for the input guys. Took my car to the mechanic today. He's telling me it's the pump.

    As I do have a Speed Sensitive System with that filter I am wondering if it is even worth trying to flush the system before actually buying that pump... any thoughts?

  14. #13
    DReffects's Avatar
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    Re: Rather uncomfortable whining - please help me figuring this out :)

    Well, I've bought the Lubegard Flush and Protect pack and flushed the Power Steering twice. Unfortunately it didn't do any good

  15. #14
    brougham is offline Cadillac Owners Master
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    Re: Rather uncomfortable whining - please help me figuring this out :)

    That's a very common sound for those cars. They almost always make that sound but usually quieter.

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