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moaning nose

Discussion in 'Chevy Trucks' started by karl klein, May 18, 2001.

  1. karl klein

    karl klein Senior Member
    Messages: 557

    i own a 1997 suburban with a 454 my problem is that about 10 seconds after i turn the engine off the car makes a very lowd yelp and i have no idea what it is
  2. 85w/350

    85w/350 Senior Member
    Messages: 190

    low octane gas?
  3. Garet

    Garet Senior Member
    Messages: 106

    Best thing to do

    here is a get a few peoplre and have them listen to various parts of the truck to see if the noise can be pin-pointed.
  4. Alan

    Alan PlowSite.com Addict
    Messages: 1,393

    Somewhere in there you have a vacuum resevoir that is dumping after the vacuum drops below a certain level. Might be hard to find but I'd start by checking out the heater controls. I think they are all vacuum operated on that year rig.
  5. karl klein

    karl klein Senior Member
    Messages: 557

    other people have told me it is a vacum leak also it comes from under the hood not from the interior i was wondering how you guys would try to pin point it also please help