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The bottom of my Macbook becomes extremely hot when I use Boot Camp (Apple's built-in solution for running Windows on a Mac), especially when I play games. Sometimes my Macbook shuts itself down because it gets far too hot.
Why does this happen, and what can I do to cool it down or keep it from becoming too hot?
The heat is due to heavy CPU usage. Be sure the exhaust vents on the back aren't being blocked by anything -- if the MacBook is sitting on a blanket or your lap, airflow will be reduced and the fans won't be able to cool as well.
My two-year-old white MacBook has never actually shut down due to high heat, but I don't use Boot Camp on it. Perhaps Windows is trying to manage the fan speeds itself and doing a poor job of it? (I'm not sure if Windows even controls fan speeds or if the BIOS does it. Correct me if I'm wrong.)
I would recommend downloading smcfancontrol and turning the fans on to max so that it doesnt get too hot.
When you reboot into windows it will remember your fan speed setting until you turn your machine off.
I think this is normal when the Macbook is executing heavy processes, like games. I wouldn't blame bootcamp.
If the Macbook continues to shut itself down, the internal fans could not be working properly. I think you should contact Apple technical support.
Firstly, make sure you've installed Apple's drivers. I'm running Bootcamp on a MacBook Pro, and it gets pretty hot, to the extent that the CPU starts throttling down. This is with the fans running on maximum. The only solution I have is to alt-tab out of the game, which reduces the strain on the processor, and allows it to cool. This can be thought of as a feature which prevents you spending too long playing games without breaks!
My Macbook is now significantly less hot under windows after a graphics driver update. So I would look into making sure all your drivers are up to date, beyond even the standard Mac drivers that Ziggamorph mentioned.
