ac works when it wants to! help!
 

i have a 01 blazer 2wd 4.3L my ac work when i wants to sometime when i turn my ac it works and lets say i turn off the ac (switch) and i turn the ac back on some time it will work and some times the ac doesnt blow cold. i was thinking its the compressor cluch switch but i could be wrong. the ac blows cold when it works but when it doesnt it doesnt blow cold...feed back would be great.