Overheating due to fans not working..why?
 

I'm trying to help my dad with his 1997 Silhouette van that reaches half the temperature and the fans just won't start.
We have replaced all the fuse and relays that help with the fans...also we have replaced the temperature sensor that tells the fans to go on.
We have also run the two fans straight from the battery to see if they work and they sure did work.
What could it be?
Any help is much appreciate!
;)

rustyballs_69
 

Can you give any input?