Aircon problems

Been very hot today so the aircon been working overtime , was in a queue for about 30 mins coming out of a show , when i got going and the engine revs above 3000 the engine started shaking and making a hell of a noise this went away when i hit the econ button disconecting the aircon compressor when i came home sprayed the aircon clutch and check it was engaging and disengaging which it was but the air con now only starts to get cold if i keep the revs up but that brings noise and vibrations but it does go cold then do you think its just low on gaz or has my compressor given up ?

don't really want to pay for a re-gaz if the compressor needs changing

by the way my car is a 2001 facelift 20v non turbo 1.8se

does the compressor get noisey if your low on gaz ?

one more question the part number on the compressor is 1j0 820 803 g which i've found out is a Zexel
there are lots on ebay new and second hand but inplace of the letter G there is h,f or k will these fit ?


any help would be great Thanks

Rob

thanks for the reply james , i'm away next week then going down the re-gaz route before i splash out on a compressor . loads of new ,recon and second hand ones on ebay but none match my number so will need to take it somewhere for the fix i expect will post up the results of the re-gaz


Rob