Sound from the engine

From the left of the car engine, there is not much clicking sound of the pulleys but every 2-3 seconds. Just like the sound of two electric wires rubbing against each other. Where can it come from?

2005 307 xs model

No one will answer ..

my teacher get well soon. the same sound was in my car, the sound from the air conditioner compressor .. the balls were making the sound, I think you probably the same ..

Thanks for the answer. The air conditioner was not turned on. A week ago, after driving for 20 minutes, the car rested for 3 hours. When I ran Trkrar, the same sound came from the same area intensely. I looked, I couldn't understand. I started and stopped the car several times 3. also improved, the voice disappeared. What I said is only this voice left.