In general a charger cannot make the computer overheat although a faulty battery can overheat. Essentially the charger sends electricity to the battery and the computer runs off the battery. So the battery is essentially acting as a capacitor for the computer. This is a great oversimplification, and not true for all laptop designs, only most.

Most laptops this is the only way the computer gets electricity. In some systems there is actually a direct connection.

It is possible for the charger to damage the battery fairly easily. The battery can then overheat, although it usually will simply not charge correctly. If you are not paying attention to your system functions, the damaged battery can damage the rest of the computer system. More than likely, a laptop overheating is due to overclocking the system, or poor ventilation.

is this reasonnment right?