Toshiba Satellite... that's pretty old, isn't it? I don't actually know.
If so, the most likely cause is:
-thermal paste finally dried up
-dead fan(s)
-clogged with dust
-all the above
The 1st one is easy enough: get some thermal paste or pads, remove the old paste using alcohol and a disposable soft cloth, and apply the new paste/pad.
The 2nd one, you'll have to check online for replacement coolers. The product ID should be on the cooler itself.
The 3rd one should be obvious enough.