Nissan Murano: Heater & Air Conditioning System :: Symptom Diagnosis / Refrigeration System Symptoms

Nissan Murano (Z52) 2015-2024 Service Manual / Ventilation, Heater & Air Conditioner / Heater & Air Conditioning System :: Symptom Diagnosis / 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.

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.	Recover refrigerant, evacuate system, and recharge with the specified amount of refrigerant. Refer to Recycle Refrigerant.
	Air flow to condenser is insufficient.	Insufficient condenser cooling performance. Poor cooling fan rotation. Improper installation of air guides. Clogged or dirty condenser fins.	Repair or replace malfunctioning parts. Clean and repair condenser fins.
	When A/C compressor is stopped, a high-pressure reading quickly drops by approximately 196 kPa (2 kg/cm², 28 psi). It then gradually decreases.	Air mixed with refrigerant.	Recover refrigerant, evacuate system, and recharge with the specified amount of refrigerant. Refer to Recycle Refrigerant.
	Low-pressure pipe is cooler than the outlet of evaporator. Low-pressure pipe is frosted.	Expansion valve opened too much (excessive flow of refrigerant).	Replace 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 A/C 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 A/C compressor operation stops. There is no temperature difference between high and low-pressure sides.	Malfunction in A/C compressor system (insufficient A/C compressor pressure operation). Damage or breakage of valve. Malfunctioning gaskets.	Replace A/C compressor. Refer to Removal and Installation.
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.	Clogged expansion valve. Breakage of temperature sensor. Clogging by foreign material.	Eliminate foreign material from expansion valve or replace it.
	There is a temperature difference between the areas around outlet and inlet pipes of liquid tank. Liquid tank becomes frosted.	Malfunction inside liquid tank (clogged strainer).	Replace condenser (includes liquid tank). Refer to Removal and Installation.
	Evaporator becomes frosted.	Clogged or crushed low-pressure pipe.	Repair or replace malfunctioning parts.
	Evaporator becomes frosted.	Malfunction in intake air temperature 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.	Low refrigerant charge. Leak or leaks in A/C system.	Check for leaks. Refer to Leak Test. Recover refrigerant, evacuate system, and recharge with the specified amount of refrigerant. Refer to Recycle Refrigerant.
Low-pressure side sometimes becomes negative.	Sometimes the area around evaporator outlet does not become cold. Sometimes the area around evaporator inlet is frosted.	Icing caused by moisture mixed with refrigerant. Deteriorated dryer material in liquid tank.	Recover refrigerant then replace condenser (includes liquid tank). Refer to Removal and Installation. Evacuate system and recharge with the specified amount of refrigerant. Refer to Charge Refrigerant.
Hunting in high-pressure side.	There is no temperature difference between high and low-pressure sides.	Malfunctioning variable valve in A/C compressor.	Replace A/C compressor. Refer to Removal and Installation. Check ECV system.

Heater & Air Conditioning System :: Symptom Diagnosis

Noise

Symptom Table Symptom Noise source Probable cause Corrective action Unusual noise from compressor when A/C is ON. Inside of A/C compressor Worn, broken, or clogged internal components...

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