Air con issue

[dans_vz]

Hey all, my air con in the Calais isnt working. When I turn the A/C on the thermo fan kicks in and the revs change a little bit but thats it. No cold air. I had a look at the valve thingy on the A/C compressor where they put the gas into it and slightly pressed the valve thing for a sec and it sounded like a bit of the gas coming out so im guessing it has gas in it? What could the problem be?
Thanks

[accentstencil]

Maybe there isn't enough gas. Even though there is a bit of gas in there, if there is not enough it won't work.