I used to think that since it is all covered up, and cannot be left open (as with desktop computer), it doesn't need an extra cooler to keep it working properly. But i learnt my lesson the hard way.
Laptop cooler are very good, and they serve well in protecting your laptop notebook from such problems as overheating.
Cooler Master Notepal S
Examples of these laptop coolers are:
Cooler Master Notepal S - This laptop cooler is simply one out of some many laptop coolers, so you probably have a lot of options to choose from. This laptop cooler is built on the laptop system, and it helps reduces the heat load from damaging the laptop components. This laptop cooler only settles for laptops of 12 - 17-inch notebooks.
The only disapproving fact is that this accessory reduces portability, and also increases its weight. So if you use a 3.5kg laptop, you should be considering an extra weight of 4.2kg. This laptop cooler also has a tilting feature that makes it bendable to your desired position. So i guess your mind should at rest now that you are aware there is a laptop cooler. All you need to do is get it fixed, and they you are good to go.