Weird whistling sound at startup
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Cadillac Catera and Cimarron Forum Discussion, Weird whistling sound at startup in Past Cadillac Vehicle Discussion; I have a werid whistling sound coming from the left (while I'm sitting in the car) wheel well. It only ...
  1. #1
    Hoosier is offline Cadillac Owners Member
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    Aug 2006
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    40

    Weird whistling sound at startup

    I have a werid whistling sound coming from the left (while I'm sitting in the car) wheel well. It only happens at startup and literally goes away after a minute or two.

    My AC and heater have also just recently stopped working...is this related?

    Thanks

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  3. #2
    gunther1000 is offline Cadillac Owners Fanatic
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    Re: Weird whistling sound at startup

    Bwhahahahah The Noise is my arch rival as well. It is your smog emmisions air pump straining against a closed control valve. Took me lots of time and exploration to figure that one out. If you just disconnect it via the plug you will get a code the second time you drive the car. I would swap out the control valve which you can see right when you open the hood behind the rad. on the battery side with like a 1 3/4" hose passing thru it and vac. lines connecting it. Good luck! P.S. in the morning when you first start it suck some vacume on that valve and it should change tone. The pump is fine it is just straining against the blockage!

  4. #3
    kmcatera00 is offline Cadillac Owners Member
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    Re: Weird whistling sound at startup

    Gunther - I have the same problem...I am glad to know that the pump is working and it is just the control valve. I think I have located the "control valve" under the hood. I believe it is on the drivers side (like you said) right on top and is about 2 inches in diameter. Is that right? Now - on Gmpartsdirect they list a By-pass valve, Check valve, and a Control solenoid. Which one is it? I'm sure it is the most expensive one (haha) but, I thought I would ask. Thanks!

  5. #4
    gunther1000 is offline Cadillac Owners Fanatic
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    Re: Weird whistling sound at startup

    Quote Originally Posted by kmcatera00 View Post
    Gunther - I have the same problem...I am glad to know that the pump is working and it is just the control valve. I think I have located the "control valve" under the hood. I believe it is on the drivers side (like you said) right on top and is about 2 inches in diameter. Is that right? Now - on Gmpartsdirect they list a By-pass valve, Check valve, and a Control solenoid. Which one is it? I'm sure it is the most expensive one (haha) but, I thought I would ask. Thanks!
    I really dont know for sure so I wont say. But I would find a break down of just call them. It could be any of the group really. I just rigged up the pump to blow off some pressure and quiet the noise. I did that by opening the snaps around the case a little. works fine and its free!

  6. #5
    kmcatera00 is offline Cadillac Owners Member
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    Nov 2005
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    Re: Weird whistling sound at startup

    Thanks - free is always good! That can be at least a temporary fix til I figure out which part I need. Thanks for replying so quickly!

  7. #6
    gunther1000 is offline Cadillac Owners Fanatic
    Automobile(s): Cadillac
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    Mar 2008
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    Re: Weird whistling sound at startup

    No problem, Im at work and pretty good at what i do so theres free time to play!

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