Why and what is it making that noise? (Video included)
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HT4100 4.1, 4.5, 4.9 Discussion, Why and what is it making that noise? (Video included) in Cadillac Engine Technical Discussion; Hey Guys, while detailing the car and having the doors open i've noticed odd sounds in a non pattern kinda ...
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    DReffects's Avatar
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    Why and what is it making that noise? (Video included)

    Hey Guys,

    while detailing the car and having the doors open i've noticed odd sounds in a non pattern kinda way coming from the engine compartment. I've took my camera and found it to be this part:



    Unfortunatley i do not know what this part actually does/is nor why it keeps making this sound while the car isn't even running.

    thanks!

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    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: Why and what is it making that noise? (Video included)

    That is the air compressor for your rear struts. You must have a leak, usually the struts when they get 20 years old.

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    DReffects's Avatar
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    Re: Why and what is it making that noise? (Video included)

    Quote Originally Posted by cadillac_al View Post
    That is the air compressor for your rear struts. You must have a leak, usually the struts when they get 20 years old.
    So that's why the "Service SSS" lamp is on?

    Could you please help me pick the correct struts at http://www.rockauto.com/ ?

    I don't want to loose that auto leveling thingy and electronic ride control, thanks

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    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: Why and what is it making that noise? (Video included)

    Oh yeah, 93 has the SSS struts and it appears that Rockauto doesn't stock them. Probably nobody has them. You could get regular struts and deal with the SSS message. Somebody will come along and clear this up.

    I ran my Deville the last couple years with no air in the struts. It sat level when it was empty but I couldn't put much in the trunk and 2 guys in the back seat made it sag pretty bad. 95% of my driving was solo so it wasn't a high priority for me. You may want to unplug that compressor if it runs too much, to save it for when you do replace the struts.

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    Re: Why and what is it making that noise? (Video included)

    Damn is there an official description/name or a part number for these?

    I found a way to disable the "Service SSS" lamp, but I'd rellay like to have the car in original condition. Is there a downside to pulling the plug on the compressor?

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    Re: Why and what is it making that noise? (Video included)

    The tail end will droop.

    Look through your car, model, system in www.gmpartsgiant.com. The level control compressor is trying to keep the rear of the car level. It does not sound healthy. Given the age of the system, the air lines and rear shock boots are probably toast, too.

    Talk to Chris in parts at Rippy Cadillac, over there >>>>>>>>

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    Re: Why and what is it making that noise? (Video included)

    They don't seem to have parts for the rear suspension

    In your opinion - do i loose a lot of ride quality if I replace the struts completely with fixed ones? I am unsure what the 'electronic ride control' actually does. Does it simply level the car when i put stuff in my trunk or is it an active suspesion that adjusts on the fly while driving over bumps like the newer cars have?

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    Re: Why and what is it making that noise? (Video included)

    Yes it is active suspension and it is supposedly expensive. I doubt the ride difference would be too drastic. The standard struts just level the car and have normal shock damping. Your best bet is to contact Chris at Rippy to get a definite answer on availability.

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    Re: Why and what is it making that noise? (Video included)

    Quote Originally Posted by cadillac_al View Post
    Yes it is active suspension and it is supposedly expensive. I doubt the ride difference would be too drastic. The standard struts just level the car and have normal shock damping. Your best bet is to contact Chris at Rippy to get a definite answer on availability.
    I've emailed Rippy Cadillac but have not gotten any response yet, I've pulled the plug on the compressor for the time being.

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    Re: Why and what is it making that noise? (Video included)

    You will find what you need here:
    http://www.monroe.com/en-US/catalog/e-Catalog

    If you need a new compressor this one will meet your needs:
    http://www.ebay.com/itm/88-DEVILLE-A...#ht_2816wt_721

    If you want to go the "passive suspension conversion" route, try these guys:
    http://www.strutmasters.com/SearchRe...llac+Fleetwood

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    Re: Why and what is it making that noise? (Video included)

    Right now you can buy Monroe SensaTrac rear struts for $35.79 from Rockauto.com You will not be able to find original SSS struts unless some pop up on ebay. They were discontinued in 2000. Get the sensatrac's with the bladder and tie back the harness that goes to the original strut.

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    Re: Why and what is it making that noise? (Video included)

    Thanks for the tip

    RockAuto Customer Service actually recommended

    . ACDELCO Teil # 903002RS {#19294055} ReadyStrut



    and

    . ACDELCO Teil # 903008RS {#19294057} ReadyStrut

    300? 300: true ); height:expression(this.height > 400? 400: true );">

    Aren't those the original replacement parts? Or just Acdelco 'aftermarket' parts without the air thingy?

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    Re: Why and what is it making that noise? (Video included)

    You only have air in the rears. Just looking at the picture, those appear to be correct for the rear. The fronts look correct also and will save you the hassle of changing the spring and upper bearing assembly.

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    Re: Why and what is it making that noise? (Video included)

    Don't automatically assume it is the shocks. While they ARE in fact 20 years old, so are the air lines. Spray down the lines and fittings with soapy water. Let the compressor run and look for foam. That'll be your leak.

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    Re: Why and what is it making that noise? (Video included)

    Quote Originally Posted by Ranger View Post
    Don't automatically assume it is the shocks. While they ARE in fact 20 years old, so are the air lines. Spray down the lines and fittings with soapy water. Let the compressor run and look for foam. That'll be your leak.
    Nice trick! Gonna try that before ordering. I've looked closely at the rear shocks and found the plastic 'airbag' to be veeeerrry worn down. lots of ripples etc. Is there a way to test if the front struts are ok or not?

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