I have recently had my 2010 civic air con re gassed and the air con works fine. What I notice is when I turn the car on now I get a rattle noise from what seems to be the air con side of the engine. I noticed some people get the noise when they switch the air con on and then noise disappears when they switch off. The noise I have seems to be on all the time. Just wondering does the re gassing of the air con put extra strain on the auxillary belt tensioner? My guess is its the tensioner or the air con clutch.
Any help would be greatly appreciated, cheers

 

Could be the compressor rattling if they over filled it.