Recent content by Mark97

  1. M

    97 Tahoe whistling

    Now that I know it's not an immediate mechanical issue, unfortunately this has gone down a couple slots on my to do list. Hope to get to it in the next couple days - I will def let you know what I find.
  2. M

    97 Tahoe whistling

    Ok. So this is what I found out today. The whistle only happens when the temperature control is set all the way cold. As soon as I get 4 "clicks" warmer, the whistle goes away. Does not fade out, it just stops. Happens with the fan on or off. The a/c doesn't matter - on or off it whistles...
  3. M

    97 Tahoe whistling

    Thanks for the other suggestions. That will give me a few things to check today. I'll let you know what I find later today.
  4. M

    97 Tahoe whistling

    Hahahaha! If it whistled like that I might not mind it as much.
  5. M

    97 Tahoe whistling

    The only time the whistle goes away is when I accelerate. No other difference in performance or behavior. Took off the pcv valve. Cleaned it up. It still rattled freely. Put it back on. I still have the whistle.
  6. M

    97 Tahoe whistling

    Hi! New forum member here. I hope this is in the right spot. 1997 Tahoe LT 5.7 gas vortec engine. Last night it just started a really high pitched whistling. All the time at idle. When I accelerate, it goes away. If I'm cruising, it whistles. It only stops when I accelerate. No noticeable...
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