MacBook Pro running hot after Mt. Lion upgrade

MacBook Pro mid-2009 2.53 with 8GB RAM and 750GB 7200 rpm harddrive: CPU seems to be running much hotter (>70 degrees C) and fan is the normal 2000 rpm per iStat after upgrading to Mt. Lion 10.8.1 and 10.8.2.  Bottom of laptop near center screen side is the hottest area.  Any ideas why?  Or how to cool it off again to the way it was before the upgrade from Lion?
Thanks.

Thanks for your links.  My MacBook fan was running constantly from switch on and the underside was getting very hot.  Using your first link, I followed the Activity Monitor instructions and found that Dashboard was using '117%'.  As soon as I closed it down the fan instantly slowed and after only a few seconds switched off..
Thanks again..

Similar Messages

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    The fan is on high all the time and the system is running very hot. It also consumes the battery way faster than it used to.

    Thanks for your links.  My MacBook fan was running constantly from switch on and the underside was getting very hot.  Using your first link, I followed the Activity Monitor instructions and found that Dashboard was using '117%'.  As soon as I closed it down the fan instantly slowed and after only a few seconds switched off..
    Thanks again..

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    I was having the exact same problem.  My MacBook Pro was seriously close to unusable how slow it was.  On a different thread, someone recommended I reset the VRAM and PVRAM (not sure about those initials).  Shut down computer.  Rebooted while holding down Command-Option-P-R all at the same time until I heard the second startup tone and then released.  I noticed an improvement in performance immediately.

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                dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[5D671681-D21B-3CCA-9810-B15E648C1B27]@0 xffffff7f9487c000

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