mac books are notorious for overheating. Some of them had plastic blocking the airvents, and some had way too much thermal paste applied to the heat sinks. If you're brave, open it up yourself have a look. If you're not, get it to a computer repair shop and ask them about their professional opinion. Make sure it's a reputable store or they'll end up telling you you've got a broken hard drive rofl... anything for some business =p. You could even try getting one of those laptop cooling pads, basically a little plastic pad with fans inside that your laptop sits ontop of. It should help you out a bit, and according to the news... save your future children. xD