Hey dude, my R33 has the same problem and it is actualy comming from the air conditioner motar. Mine has had the problem on and off for 4 years now comming and going randomly. It has not affected the climate controll in anyway it's just been an anoying sound for the first minute or so when you start the car. I asked a mech about it and he said that it would cost $350 for a new motar. Since it doesnt affect it in anyway I have just left it. I've never had a second opinion so he might just be trying to rip me off. Might be worth looking into. He said it was something catching on a fan inside the motar that makes the clicking noise.