It has been a while since I last turned on my AC. A couple days ago, I tried to turn it on, but it only blow hot air. So when I got back home, I checked around, and found out that the AC didn't kick in (no click sound) when I pressed the AC button. I checked the heat and MG clutch relays, both seemed fine, and no fuse blow. Anyone has any idea where else I should be checking or the compressor is bad?