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  1. S

    99 tahoe cabin noise - sounds like vacuum

    Not the alternator. I swapped with a known good unit off my other '99 and no change.
  2. S

    99 tahoe cabin noise - sounds like vacuum

    Update - hold the phone - I realized the recirculate is indeed working, its just not as audible on this 99 as my other 99. The indicator light is intermittent so that is not the issue. Oddly enough I did notice that holding both front window switches in the up position as the glass is already...
  3. S

    99 tahoe cabin noise - sounds like vacuum

    Thanks to all so far. Yes the vacuum sound does continue after engine shutdown, dissapating to nothing in about 3 seconds or so. I really can't believe how audible it is inside the cabin - it honestly sounds like an old Qjet. The recirculate does not work in any mode of operation, I tried...
  4. S

    99 tahoe cabin noise - sounds like vacuum

    Well I notice my recirculate is not working, or at least the button is not illuminating when depressed What is the flap you mention?
  5. S

    99 tahoe cabin noise - sounds like vacuum

    Get ready to laugh - what are spider injectors? This engine runs great no codes ever, did have to change the IAC - was bad and made the idle rpm wander up and down. A bad vacuum leak usually makes the rpms jump, try it - disconnect your booster hose.
  6. S

    99 tahoe cabin noise - sounds like vacuum

    It idles at about 475 rpm, just a tick under the 500 mark. I'd love to bump it up just a hair because the engine resonance at exactly that rpm makes my side mirror rattle When I adjust the butterfly screw-stop the computer compensates with the IAC to bring it back down. I see only a couple vac...
  7. S

    99 tahoe cabin noise - sounds like vacuum

    I have recently bought another 99 Tahoe - it had a bad engine so the motor has just been replaced. Now I am hearing an audible sucking sound from behind or under the dash when the radio and ventilation systems are all off. Truly sounds like an old school Qjet with the air cleaner off for those...

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