Whining noise on startup and acceleration

[AFradartech813]

As the title says, when i startup the vehicle it has a very loud whining noise. This noise also persists when i am accelerating, but gets MUCH quieter when i am just coasting and not on the accelerator. When i am sitting in park, the noise almost disappears, but if i am in park and rev the engine up, it makes the sound. It seems to coincide with the rpms of the engine. The sound seems to be coming from the engine, but i could be wrong as im not very knowledgeable on this. Any help is greatly appreciated.

2005 Explorer XLT 4x4 132,600 miles

 

[AFradartech813]

bump

 

[n2audio]

I'd start with checking the serpentine belt tensioner. Sounds like it could just be a loose belt.

 

[AFradartech813]

I will do that. Thanks for your input

 

[klava73]

Добрый день. Это может быть коробка передач, если после замены натяжителя свист остался.