when i turn on the ac it sometimes work and sometimes not work, what could it be? when i turn it on at night, it F-ing works..i need help guys...

 

man i just notiesed 2 weeks ago that my 93 prelude does the same thing, and sometimes it wont switch positions, the button will light up but it wont switch to other positions ill stay at one and AC button lights turns off by it self sometimes

 

This is a common issue for 4th gens. You'll need to resolder the solder points on the circuit board.

http://92lude.com/forum/showthread.php?t=3977

 

YUp I used to have to bang mine to get it on and off,then just did the resoldering job.....and voila,its works correctly