Noise While Operating A/C System [Full-Auto Air Conditioner]: Notes

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

NOISE WHILE OPERATING A/C SYSTEM (FULL-AUTO AIR CONDITIONER) - DESCRIPTION & POSSIBLE CAUSE

DESCRIPTION	Noise from magnetic clutch, A/C compressor, hose or refrigerant line
POSSIBLE CAUSE	Magnetic clutch operation noise A/C compressor vane noise A/C compressor slippage noise Hose or refrigerant line interference noise

*:If there is gas leakage, air enters the A/C system. The desiccant within the receiver/drier absorbs the moisture from the air and becomes saturated. If the A/C system is used in this condition, the inside of the A/C compressor will begin to rust due to this moisture, which may cause lock up or noise to occur. Therefore, replacement of the receiver/drier is necessary.