I have a late 2009 Macbook Pro that is running Mavericks that has been heating up to the point where I cannot touch it on the bottom because of the heat being generated. I know this can be a result of a lot of RAM is being used at once - but it has become more frequent with the upgrade to Mavericks then under any of the old OS systems. To where even a few minuets of YouTube video with another App open is enough to hear the fan start increase in speed. Should I downgrade back to Mountain Lion (is it even possible?), does it just need to be opened up and cleaned, something else? I just don't want to fry anything or do damage to other components due to the heat.