I noticed this sound the day after I purchased. Took it back and the service tech said he heard the squeal but wanted me to break the vehicle in more first. This vehicle had about 50 miles on it. I now have about 5000 miles on it and it is still doing the same thing. Upon initial acceleration, between 1800-2200 RPM's and under 40mph there is a loud squeal. I mash the accelerator a little harder when I hear it and it goes away. Or I can maintain constant pressure and the noise is continuous. So the noise is easily controlled by acceleration. I don't have any idea what it could be. I am scheduled to take it back to the dealership, but I am skeptical as to the reconciliation, given that they did not seem to be too concerned about it the first time I brought it in.
It could be a belt or a bad bearing in one of the accessories or and idler/tensioner pulley.
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Could it be one of the belts is a little loose. Check it with the engine cold.
I hope this helps you.
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