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  1. #1

    Default 2005 Avalanche whistling sound when the engine is cold

    I get a whistling sound ,when the truck is first started in cool temperatures. Give it a shot of gas and the sound gets louder. goes away once the engine is warmed up.

  2. #2

    Default

    Hmmm, just thinking of all of the times I've had that problem,
    - could be an exhaust leak (I had a crack in an exhaust manifold that stopped leaking when the manifold expanded),
    - could be a belt (an old belt, maybe 75 to 80 k miles, would squeal when cold),
    - the radiator fans have clutches that let the fan turn only when the engine is hot (I've had fans with poor clutches that would be noisy when cold).
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  3. #3

    Default

    Quote Originally Posted by RayVoy View Post
    Hmmm, just thinking of all of the times I've had that problem,
    - could be an exhaust leak (I had a crack in an exhaust manifold that stopped leaking when the manifold expanded),
    - could be a belt (an old belt, maybe 75 to 80 k miles, would squeal when cold),
    - the radiator fans have clutches that let the fan turn only when the engine is hot (I've had fans with poor clutches that would be noisy when cold).


    I agree with all the things rayvoy mentioned. it Could also be a bad bearing in one of the pullys under the hood.

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  4. #4
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    Default

    Does it have a CAI?
    08 Z71 Avalanche Mods to date: K&N CAI,Hellwig Swaybars and End Links, Corsa Sport Exhaust, Superchips Programer,IPCW LOF & 3rd brake light and tails, AMI Gas door,Show Hooks and Door locks, Enkei Wheels, with Pirelli tires, StreetScene Bowties, Grant Steering wheel,Muth signal mirrors,SSBC Big Brake kit,Huskyliner Mug gards,Floor mats and Hood shield, McGard Lug nuts and locks, Bedrug, Cervini's Ram Air hood,35watt HID Fog lights, Sylvania bulbs all around ZXE's Highs and Lows, WhiteNight Back up lights,Sirius and HD Radio, SnugTop sitting on deck now Got a Softopper on now,Tempress Boat Hatches.... New Bilstein shocks are on... New Mods coming soon..... X

  5. #5

    Default

    I am thinking a squealing pulley.
    I have the same issue right now with mine.
    Only squeals when cold and first started, but goes away after warm up.
    I haven't investigated it thoroughly yet, but if you find the issue yourself, please post it on here and let us know!
    2004 Chevrolet Avalanche Z66 WBH, AVS smoked rain guards, AVS smoked bug shield, Bose 6-disk CD changer, Bully Fire Strip w/ Sequential turn, 6 on-high, amber DRLs, tinted euro tails, Pace Setter Performance Dual Exhaust, K&N CAI, GlowShift gauges in dual pillar pod.

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