One recent issue I noticed with the Toshiba Satellite U205-S5002 (or perhaps any Toshiba Satellite notebook) is that the fan is always on. Even after taking out the keyboard and using compressed air to remove the dust, the fan stays on no matter what. One thing you can do is to enable the "TOSHIBA Power Saver" power scheme inside the Power Options manel, which lets you have access to the Toshiba Power Saver icon in the Control Panel. You can then change the Cooling Method from "Cooling Optimized" to "Maximum Performance." Apparently not using the Toshiba Power Saver appears to keep the fan always turned on.
Note: you should double-check that the fan actually turns on in "Maximum Performance" (i.e. playing multiple YouTube clips simultaneously to tax the CPU). If the fan is actually working, it could simply be a configuration issue in your Control Panel.