first i would test the fan!
how
find the 12v wire on the Fan plug make sure it is at 12v
then take a spare piece of cable put it to the chasis earth and dab the other end of it on the black 0v wire at the fan
the fan should run at full speed
this will prove the fan is ok
how
find the 12v wire on the Fan plug make sure it is at 12v
then take a spare piece of cable put it to the chasis earth and dab the other end of it on the black 0v wire at the fan
the fan should run at full speed
this will prove the fan is ok