I would guess it's the compressor. I replaced mine right before I sold the car at 104k miles. On mine, you could hear the clutch engage, and that's when I heard the small grinding/ticking noise. I even tried it by turning the front defroster on and off; same noise.
A buddy helped with replacing the compressor, then I took it to a shop to evacuate and refill the system.
AC can be tricky. Either a bad compressor, leaking or clogged condensor, or low freon. Not a fun system to work with.
Edit: If you're not mechanically inclined or don't have someone who is that can help you out, I say take it to a shop. Luckily I had a very handy friend who is very experienced help me with the work. Otherwise, I would have just gone to a shop and paid the outrageous price.
Bookmarks