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I have a 2009 Sierra that has recently developed a buzzing noise coming from the passenger side of the truck. The noise happens at 40 mph when I let my foot off the accelerator. The same noise happens between 70-75mph. The noise sounds like plastic buzzing or vibrating against plastic. I had removed my bug shield with no relief from the sound. My truck unfortunately is out of warranty.

 

 

Thanks

Nick

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it could possibly be your windshield trim piece :thumbs: . its been known to affect a number of us on here. Mine slapped on the passenger side up high, I took it to the dealer, they pulled it off, re-sealed everything and sent me on my way. its been fixed ever since. mine sounded more like plastic SLAMMING more plastic, annoying as hell......

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it could possibly be your windshield trim piece :thumbs: . its been known to affect a number of us on here. Mine slapped on the passenger side up high, I took it to the dealer, they pulled it off, re-sealed everything and sent me on my way. its been fixed ever since. mine sounded more like plastic SLAMMING more plastic, annoying as hell......

 

 

I will have to take a look. I had the trim piece making the noise like someone was throwing sand at the window. This noise is getting to be really annoying because it only happens in the speeds I am mostly in. It is weird that as soon as I get up to 45 it goes away and doesn't come back until 70 and then goes away at 75.

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I bet that is it :thumbs:

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My 08 Sierra had AC lines that were vibrating in that area.

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My 08 Sierra had AC lines that were vibrating in that area.

 

Matt

 

What did you do to solve the AC lines vibrating?

 

Nick

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I had an 02 Avalanche that did something very similar. There was a definite "buzzing" sound under very specific conditions. The throttle position, engine load and rpm had to be just right for it to make the noise. But as you problem, it mostly occured around the speeds I mostly traveled with the engine lugging slightly. The sound was not a rattle. It was a definite buzzing sound. It turned out to be the heat exchanger in the AC unit making contact with the plastic housing. My solution was to put a wedge between the metal cross member in the dash and the plastic housing that held the heater coil and heat exchanger. The way I found the source of the noise was to let a friend drive the truck and listen for the noise and push on certain items until the noise would stop.

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My 08 Sierra had AC lines that were vibrating in that area.

 

Matt

 

What did you do to solve the AC lines vibrating?

 

Nick

 

 

Dealer fixed it. Idk.

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