I turned on my car this moring and she was grumpy. its a loud rattling noise under the hood. Its hard to pinpoint it but it sounds like it coming from the fan assembly. I checked ot out but can't tell wht hell its coming from. When i rev the motor it gets worse. Its pretty loud. You can definatley hear me pulling up. Power seems to be ok. Anyone have any suggestins on what this could be?