Sound from engine compartment on 2002 Toyota Avalon

Hi All,
When I start my car, it starts to make a sound from the right side of the engine compartment. Some days this is not there at all. Any one has any info ?

Asked by for the 2002 Toyota Avalon
When you say right side of the engine do you mean right side as seen sitting in the driver's seat, or right side looking into the engine compartment? I suspect a fan belt is "loose". The fan belts are on the passenger side of the engine and may give a high pitched squeal when you first start the car or turn the steering wheel.
Yes. I meant right side as seen sitting in the driver's seat. It seems what you said is correct. Thaks a lot :)
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