Toshiba satellite a215-s7422 fan not running can i

Replacing your fan will void your warranty.

I would advise talking to toshiba for a replacement.

If still you want to replace ir, you have to disassemble the whole laptop to replace the fan, all you have to do once disassembled is unplug the original one and plug the replacement one, but you have to use only compatible ones, or else you will burn your cpu or the fan wont fit.

For a quick resolution, buy a powerfol laptop cooler.

Cheers