Diagnostic Procedure

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

NOISE WHILE OPERATING A/C SYSTEM (AUTO A/C) DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	INSPECT A/C COMPRESSOR FOR SLIPPAGE NOISE Is there a squeaking or whirling sound (A/C compressor slippage noise)?	Yes	Go to Step 4.
1		No	Go to the next step.
2	INSPECT A/C COMPRESSOR FOR INTERFERENCE NOISE Is there a rattling or vibrating sound (interference noise)?	Yes	Go to Step 7.
2		No	Go to the next step.
3	INSPECT A/C COMPRESSOR VANE FOR NOISE Is there a jingling, popping, beeping, or buzzing sound (A/C compressor vane noise)?	Yes	Replace the magnetic clutch, then perform the repair completion verification. (See MAGNETIC CLUTCH DISASSEMBLY/ASSEMBLY [SKYACTIV-G] .)
3		No	Normal (Verify malfunction symptom.)
4	INSPECT DRIVE BELT Inspect the drive belt. (See DRIVE BELT INSPECTION [SKYACTIV-G (VIN L (US))] .) (See DRIVE BELT INSPECTION [SKYACTIV-G (VIN M (US))] .) Is it normal?	Yes	Go to the next step.
4		No	After adjusting the drive belt tension, go to the next step. (See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-G (VIN L (US))] .) (See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-G (VIN M (US))] .)
5	INSPECT DRIVE BELT Is there drive belt deterioration, foreign matter penetration in the belt, or oil on the belt?	Yes	Remove obstruction, remove oil, or replace drive belt, then perform the repair completion verification. (See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-G (VIN L (US))] .) (See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-G (VIN M (US))] .)
5		No	Go to the next step.
6	INSPECT MAGNETIC CLUTCH Inspect the magnetic clutch. (See MAGNETIC CLUTCH INSPECTION [SKYACTIV-G] .) Is the magnetic clutch normal?	Yes	Replace A/C compressor (excluding pressure plate, A/C compressor pulley, and stator), then perform the repair completion verification. (See A/C COMPRESSOR REMOVAL/INSTALLATION [SKYACTIV-G] .)
6		No	Replace the magnetic clutch, then perform the repair completion verification. (See MAGNETIC CLUTCH DISASSEMBLY/ASSEMBLY [SKYACTIV-G] .)
7	VERIFY LOCATION OF ABNORMAL NOISE OCCURRENCE Is noise emitted from A/C compressor?	Yes	Visually inspect A/C compressor, replace appropriate parts if necessary, then perform the repair completion verification. (See A/C COMPRESSOR REMOVAL/INSTALLATION [SKYACTIV-G] .) (See MAGNETIC CLUTCH DISASSEMBLY/ASSEMBLY [SKYACTIV-G] .)
7		No	If abnormal noise occurs from the hose or system piping, perform repairs in the area causing interference with the hose or system piping due to clip removal or screw looseness, then perform the repair completion verification.
Repair completion verification	VERIFY THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR Has A/C compressor noise stopped?	Yes	Troubleshooting completed. Explain repairs to customer.
Repair completion verification		No	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(US)] .) If the CAN communication is normal, perform the diagnosis from Step 1.