noise heard while shifting only with a.c on?
 

I've been noticing on these hot summer days with the ac on, sometimes (maybe one in 10 shifts) there's a kind of growl or pump noise between first and second gear shifts. Sometimes happens between 2 and 3, I think it has more to do with the clutch being pressed in and not the actual shifting of gears. I can only get it to make the noise when the ac is on, any ideas on what it could be?

I get the same noise with a/c on with my 06.

Glad it's not just me. I'm also glad it doesn't do it with the ac off (eliminating the engine itself) but I HATE weird noises from my cars. Any idea what it would be? Maybe the belt/tension?