2009 Lexus ES350 Q&A

2009 Lexus ES350 Question: It sounds like a fan is running when the car is on...

Today, 6/18/12, when I started my car I heard this loud noise coming from under the hood. It never stopped the entire trip to work. Has anyone had this occur? BTW It never ran hot. Do you think it's harming the engine? Thx. (No codes showed up on the screen.) it did it again on the drive home. -
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