Many years ago, my new car (different brand) also got this "shi shi" sound from the air-cond when making a turn.
Turned out is was air bubbles trapped in the radiator's coolant.
What they did was open the radiator cap and start the engine, let the engine warm up and wait for the water pump to circulate the coolant. Once the coolant moved and air bubbles released, top up coolant in the radiator and close back the cap.
Shi shi noise gone after that.

Not sure if you have the same issue as mine.