Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
OS X Mountain Lion Users Reporting Overheating Issues
We first saw users reporting WIFI issues a couple of days later we have heard multiple users having huge drainage on the Macbook batteries and now we have heard that users are suffering from over heating problems on both Macbook Pro and Macbook Airs.
Users are reporting that they are stugling to work on their Macbooks for anymore then 2 hours before the laptop becomes extremely hot and overheats. This seams to be a problem with the fan control as on the other hand we are hearing from a couple of users who are reporting the Macbook fans are constantly on.
@MacReviews another battery issue. 2011 MBA, installed Mountain Lion today, fans kick on every few minutes, battery life is poor.
— Sam Napolitano (@eightamrock) July 29, 2012
@MacReviews New Mountain Lion is killing my new MBP Retina…..fan is constantly on and you can watch the battery drain away…
— Adrian Cunningham (@Crafty_B) July 28, 2012
If you are having any issues with OS X Mountain Lion be sure to let us know
OS X Mountain Lion