jimbos99cobra

I have a 99 and my A/C compressor clutch wont kick on when i turn the A/C on. Is there a fuse/relay that could have gone bad?? I know its possible to have a freon leak and it wont tun on if there is not enough pressure but I wanted to check the relays/fuses before taking it in to the shop. Is there any way to bypass the pressure switch to check it? It did not come with a manual so I can not look it up on my own and any help would be great. I would like to get it resolved before the warming up starts here.

Thanks Jimbo