in cabin under the driver side kick panel there is a fuse box, check for burned fuses. replace, with correct rating. if all ok then
open up the hood, check for the electrical box, next to battery tray there are 2 relays in it , one is for normal operation of fan over radiator without ac & the other becomes alive only when AC is switched on., check the relays using dmm or by swapping new ones.
hope it will help