Loud fast clicking noise from air conditioner compressor

Air conditioner died end of last year, simply not blowing cold air. I did nothing. This spring there was not refrigerant in the system, so I went to recharge it. There was a leak. I replace the line from condenser to evaporator, because it was leaking on connection between two hoses. Again my air conditioner was not working, then my mechanic replace the air conditioner control module, and finally the air conditioner starts to blow a cold air. Now after a five to ten minutes of working I am starting to hear loud fast clicking noises from the compressor department. Noises are very fast and loud, rapidly repeating. When I turn the air conditioner off, they stop. Again when I turn the air conditioner on, now after three to five minutes they start again. What is happening?