your calculations do make a some sense but i honestly dont know exactly many Kw's you would need to cool the volume of air inside a standard house (over a given period of time), but isnt it safe to assume you need considerably lower Kw's to cool the volume in a car?.. however you may be right about the bearing, the vibration/ rattle "feels" like its coming from a moving/or rotating component, I'll check for belt dust as you suggested, and post what i find ...please any more suggestions on what could be wrong.. Cheers guys

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