how can i fix my ford escort mk6 radiator fan?

hi how can i fix my ford escort mk6 radiator fan.
it's on my 1.6 zetec.
i not long got the car witch i swoped for my bravo.
and yep the fan dont work. so if i dont keep the heat on in the car. to blow warm it well go up! iv looked at the fan.
so can enyone help? or should i just get a new fan?