Uhhh... what year civic do you have?

Is it remotely possible that you put the wrong stuff in your refrigerant system? Maybe your car is supposed to use R-134a and not Freon. Freon has a bigger molecule and won't compress in a R-134a system. You might want to verify if you have a pre-'94 (I think) whether or not the AC system was updated. I think the upgraded o-rings are green, and that means it needs R-134a. Someone else verify this, though...