I have this issue on my 03 CL-S 6MT. With AC on, I get a "cycling" hiss from what sounds like behind the glove. Hisses for about 10 seconds, then goes away for 30 seconds or so, then comes back.

AC off, sound goes away instantly.

AC is ice cold though, so I'm not that concerned. Or, should I be?

Compressor I'm guessing, possible leak?

Thanks!

 

Normal. Compressor cycling on & off & releasing pressure build up. It's a lot worse with a CAI.

 

Thanks for the info. I thought it was something like that, just a bit annoying.