SPR's: Psensor is a graphical hardware temperature monitor for Linux. It is a GTK+ application for monitoring hardware sensors, including temperatures and fan speeds.
Do you every wanted to know – what is the temperature of your PC or laptop when it becomes so hot and throws out warm air? There any and it can happen without any hardware fault, due to various software issues e.g. buggy graphics card driver, misconfigured fan control program, malfunctioning CPU frequency scaling daemon, etc. Another quite common cause for overheating is dust, dirt and debris clogging the cooling system (fan, heat sink and ventilation openings).