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Notorious
TrailblazerSS
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227 Posts
Discussion Starter #1
I noticed a humming sound when I drive the truck for the first 10 seconds after starting it up. It sounds like the A/C compressor running, then goes away. I doubt it has to do with my wobbly tensioner. Not sure if this is normal?
 

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Registered
TrailblazerSS
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808 Posts
Could be the air suspension if it's not coming from the engine compartment. This is normal if the noise is coming from the back of the truck.
 

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Registered
TrailblazerSS
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223 Posts
I'm going to go out on a limb and ask if it might be the mechanical fan clutch??? It might be engaged for 10 seconds or so when you first drive the truck, then it disengages and the hum goes away???
 

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Willy M'Fn Wonka
07 Trailblazer SS
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7,244 Posts
Newbomb, tell your mom to get her head out of your lap and sit up straight in the passenger seat. Humming noise should disappear.
 

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Registered
Trailblazer SS
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196 Posts
I get a weird noise only on acceleration, sounds kinda like a rattling like maybe a bad cat or something. If I rev the engine in park or nuetral it doesn't happen. Maybe lack of oil somewhere
 
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