Radiator fan not working help please!
 

Hello, last week I noticed that my cooling/Radiator fan doesn't work, when using the Air con the drivers side fan comes on and seems to work fine but the other fan (passengers side) has stopped working, is there anything should I check for, (car is a hawkeye STi) I'd appreciate your advice cheers Mark.

Fuse.
Wiring to it, (corrosion, loose or broken wires).
The sender.

I've now checked all fuses and wiring seems fine even the fan and motor looks good from what I can see, when the car is up to temp the fan sometimes comes on for about 2 seconds and then slows down and is running very slow. It's definitely not running as it should, Anything else I should check?