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TrailBlazer 2002-2009
The TrailBlazer, originally introduced as an upscale Blazer, was produced from 2002 to 2008 with a powerful I6 engine and with a monster V8 offered in the Trailblazer SS
Platform: GMT 305, 360, & 370.

2004 Humming from engine

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Old February 15th, 2011, 12:31 PM
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Default 2004 Humming from engine
I experience a high pitched humming noise coming from my engine after driving a few minutes, but it is only when i am going less than about 2 mph. It goes away as soon as i accelerate, and comes back when im almost stopped. I can put it in park and it still makes the noise. I opened the hood and couldnt tell exactly where it was coming from. Any suggestions?
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Old February 17th, 2011, 7:07 AM
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remove the serpentine belt to isolate, also check/rotate pulleys to feel/hear if all is ok...
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