im having "probably" a similar issue.
What exactly is an aux fan?
is it the fan for the AC condenser or the radiator? coz in my Civic 99 i got 2 fans (AC and radiator). The prob is i noticed the fan for the radiator isnt working already, although the car hasnt overheated yet. the AC fan still works, but the AC isnt that cool anymore (parang lesser air blowing in).

Is it possible that due to my busted RAdiator fan, it has affected the AC cooling? or are both fans independent of each other.
appreciate the help. TIA