Nissan Sentra B18 (2020-2025) Service Manual: Symptom Table

Nissan Sentra B18 (2020-2025) Service Manual / Ventilation, Heater & Air Conditioner / Heater & Air Conditioning System :: Symptom Diagnosis / Noise / Symptom Table

Symptom Table

Symptom	Noise source	Probable cause	Corrective action
Unusual noise from A/C compressor when A/C is ON.	Inside of A/C compressor	Wear, breakage or clogging of foreign material in inner parts.	Check A/C compressor oil. Refer to Inspection.
	Magnet clutch	Contact of clutch disc with pulley.	Check clearance between clutch disc and pulley.
	A/C compressor body	Loosened A/C compressor mounting bolts.	Check bolts for tightness. Refer to Exploded View.
Unusual noise from cooler piping.	Cooler piping (pipe and flexible hose)	Improper installation of clip and bracket.	Check the installation condition of the cooler piping. Refer to Exploded View.
Unusual noise from expansion valve when A/C is ON.	Expansion valve	Shortage of refrigerant.	Check for leakage. Collect all refrigerant, evacuate refrigerant cycle again, and then refill it with the specified amount of refrigerant.
Unusual noise from expansion valve when A/C is ON.	Expansion valve	Wear, breakage or clogging of foreign material in inner parts.	Eliminate foreign material from expansion valve or replace it.
Unusual noise from belt.	—	Loosened belt	Check belt tension. Refer to Inspection.
Unusual noise from belt.	—	Internal A/C compressor parts get locked	Replace A/C compressor. Refer to Removal and Installation.

Noise

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Heater & Air Conditioning System :: Periodic Maintenance

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