kgturner

my girlfriend recently bought a 2000 impreza wagon. the a/c blows cool, but it's not very cold. i'm thinking of checking to see if it needs a recharge. i did a search, but couldn't find anything particular. is there any type of write up or diy about how to recharge the a/c system. i'm not familiar with subaru engine bays as i'm a VW guy. it may be obvious, but, just in case, can anybody tell me where the low pressure valve is so i don't spend all evening searching for it. thanks in advance. kevin t