After installing Mountain Lion iMac warmer

After I have installed Mountain Lion, I hear for the first time the fan on my iMac running. It's a iMac11,3 (mid 2010 model) with 4GB RAM and a standard configuration. Granted, it is mid summer and around 85 degrees but we had such warm days before in the last two years. And for the first time, the iMac gets very warm and the fan starts to run. It happened right after the install of Mountain Lion so that I don't think it's a problem with the fan.
Has anyone seen similar situations?

As old as your iMac is, have you cleaned out the dust? Dust buildup can lead to over heating issues. Remove any and all things plugged into it including the power cord, Remove the RAM access grille. Vacuum all openings starting with the RAM access area (air intake). Vacuum all ports and plugs, DVD slot and the opening across the top of the rear of the body. Blow compressed air through all your openings and vacuum again to remove any dust you loosend. Reinstall the RAM grille. Plug in the keyboard and mouse if not blue tooth. Insert power cord...
You are now in a perfect position to do a
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
It is the 5 second timing that initiates the reset.
Here is a link to a Widget to monitor your temps and other operations:
http://islayer.com/apps/istatpro/

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