Nissan Ariya: Symptom Diagnosis

Nissan Ariya (FE0) 2023-2025 Service & Repair Manual / Ventilation, Heater & Air Conditioner / Heater & Air Conditioning System / Symptom Diagnosis

Refrigeration System Symptoms
Noise

Refrigeration System Symptoms

Trouble Diagnosis For Unusual Pressure

Diagnose using a manifold gauge whenever system’s high and/or low side pressure(s) is/are unusual. The marker above the gauge scale in the following tables indicates the standard (usual) pressure range. Refer to above table (Ambient air temperature-to-operating pressure table) since the standard (usual) pressure, however, differs from Nissan Ariya vehicle to vehicle.

Symptom Table

Gauge indication	Refrigerant cycle	Probable cause	Corrective action
Both high- and low-pressure sides are too high.	The pressure returns to normal soon after sprinkling water on condenser.	Overfilled refrigerant.	Collect all refrigerant, evacuate refrigerant cycle again, and then refill it with the specified amount of refrigerant.
	Air flow to condenser is insufficient.	Insufficient condenser cooling performance. Poor fan rotation of radiator and condenser. Improper installation of air guide. Clogged or dirty condenser fins.	Repair or replace malfunctioning parts. Clean and repair condenser fins.
	When compressor is stopped, a high-pressure reading quickly drops by approximately 196 kPa (2 bar, 2 kg/cm², 28.4 psi). It then gradually decreases.	Air mixed in refrigerant cycle.	Collect all refrigerant, evacuate refrigerant cycle again, and then refill it with the specified amount of refrigerant.
	Low-pressure pipe become hot.	Electric expansion valve opening / control error.	Check DTC with consult Replace temperature sensor and pressure sensor. Check the connection of the electric expansion valve. Replace electronic expansion valve.
High-pressure side is excessively high and low-pressure side is too low.	High-pressure pipe and upper side of condenser become hot, however, liquid tank does not become so hot.	Clogged or crushed high-pressure pipe located between compressor and condenser.	Repair or replace the malfunctioning parts.
High-pressure side is too low and low-pressure side is too high.	The readings of both sides become equal soon after compressor operation stops. There is no temperature difference between high- and low-pressure sides.	Malfunction in compressor system (insufficient compressor pressure operation). Damage or breakage of valve. Malfunctioning gaskets.	Replace compressor.
Both high- and low-pressure sides are too low.	The area around evaporator outlet does not become cold. The area around evaporator inlet becomes frosted.	Electric expansion valve opening / control error.	Check DTC with consult Replace temperature sensor and pressure sensor. Check the connection of the electric expansion valve. Replace electronic expansion valve.
	Evaporator becomes frosted.	Clogged or crushed low-pressure pipe.	Repair or replace malfunctioning parts.
	Evaporator becomes frosted.	Malfunction in intake sensor.	Check intake sensor system. Refer to Diagnosis Procedure.
	There is a small temperature difference between the high and low pressure pipes for refrigerant cycle.	Shortage of refrigerant. Leakage of refrigerant.	Check for leakage. Collect all refrigerant, evacuate refrigerant cycle again, and then refill it with the specified amount of refrigerant.

Noise

Symptom Table

Symptom	Noise source	Probable cause	Corrective action
Unusual noise from compressor when A/C is ON.	Inside of compressor	Wear, breakage, or clogging of foreign material in inner parts.	Check compressor oil. Refer to Inspection.
Unusual noise from compressor when A/C is ON.	Compressor body	Loosened 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.