Climate control system in a crossover Nissan Murano generation Z52 is a complex engineering solution that provides comfort in any weather. The heart of this system is air conditioning compressor, which is responsible for circulating the refrigerant and creating the necessary pressure in the circuit. Unlike previous generations, the Z52 model is equipped with more modern units with electromagnetic control, which increases efficiency, but also makes it more difficult to diagnose when problems arise.
Compressor failure often occurs suddenly, turning the car interior into a stuffy room even in moderate heat. Many owners are faced with the fact that diagnostics show the presence of pressure, but the cold does not come, or a characteristic knock is heard from under the hood. Correct understanding of operating principles air conditioner Nissan Murano allows you to avoid unnecessary costs for replacing serviceable components and quickly eliminate the malfunction.
Design and principle of operation of the compressor on the Nissan Murano Z52
In the model Nissan Murano Z52 a six-piston axial piston compressor is installed, which is driven by a belt from the engine crankshaft. A special feature of this unit is the presence of an electromagnetic clutch, controlled by the climate control unit depending on the set temperature and engine load. This allows the system to shut down under hard acceleration to conserve power, which is critical to the crossover's dynamics.
The operating cycle is based on pumping freon from low pressure to high pressure. Pistons inside the housing perform reciprocating movements, compressing the gas and directing it to the condenser. The Z52 system uses refrigerant R-134a, which requires special oils and circuit tightness. Any deviation in work piston group leads to loss of performance and overheating of the entire system.
The electrical part of the compressor control includes a pulley position sensor and a pressure sensor. The control unit receives signals and regulates the supply of current to the clutch coil. If the system detects abnormal pressure, it forcibly turns off the compressor to protect against destruction. Understanding this logic helps when reading errors through a diagnostic scanner.
- 🔧 Electromagnetic clutch Provides instant on and off without breaking the belt.
- ❄️ Axial piston group It is characterized by high reliability and smooth operation.
- ⚙️ Pressure sensors protect the system from excess or insufficient freon pressure.
Typical symptoms of malfunction and causes of breakdowns
Problems with the compressor can be recognized by a number of characteristic signs that appear during operation. The most obvious symptom is the complete absence of cold when the fan is running and the air conditioner is on. In this case, you need to check whether the compressor pulley rotates when the button is pressed A/C on the control panel.
Sound signals also play an important role. If you hear a loud squeaking, whistling, or metallic grinding sound coming from the front of the engine, this could indicate a worn pulley bearing or broken internal pistons. In some cases, the compressor begins to vibrate, which can be felt through the steering wheel or pedals, especially at idle speed.
Failure is often caused by insufficient oil or moisture entering the system. Moisture causes corrosion of metal parts inside the housing, and lack of lubrication leads to scoring on the cylinder walls. Also a critical factor is contamination of the system, when wear particles fly around the circuit, clogging the expansion valve and condenser.
⚠️ Attention: If, when you turn on the air conditioner, hot air blows from the deflectors, and there is no noise when the unit is operating, the problem may not be in the compressor itself, but in a low level of freon due to a leak. Do not try to pump up the system until you find the leak.
- 🔊 Noise and vibration indicate mechanical wear of the bearings or pulley.
- 🌡️ No cold often associated with rotor jamming or loss of tightness.
- 💧 Oil stains on the compressor housing indicate the destruction of the shaft seal.
- No cold
- Creaking or knocking
- Steering wheel vibration
- Burning smell
System diagnostics and troubleshooting
Before removing and replacing the compressor, it is necessary to conduct a thorough diagnosis to exclude false conclusions. The first step is a visual inspection of the drive belt and the unit itself for traces of oil and mechanical damage. Check the belt tension, as slippage may indicate a compressor failure.
Use a pressure gauge station to measure system pressure. Connect hoses to the low and high pressure service ports. With the engine running and the air conditioning on, the pressure on the low side should be within the range 2.5–3.5 bar, and on the high side - 13–16 bar. Significant deviations indicate performance problems or a clogged circuit.
A diagnostic scanner will help you read error codes from the climate control unit. Errors related to the coolant pressure or clutch control circuit may make troubleshooting easier. Pay attention to the real-time parameters: if the switching command is given, but there is no current, the problem is in the electrics or the clutch itself.
☑️ Stages of primary diagnosis
It is important to consider that sometimes the problem lies not in the mechanics, but in the electrics. Check the fuses and relays for the compressor circuit. In the car Nissan Murano Z52 Smart relays are often used and can fail without visible signs. Also check the condition of the wires and connectors going to the compressor, as corrosion of the contacts may prevent voltage supply.
⚠️ Attention: Never try to force start the compressor by applying power directly without checking the pressure. If there is no freon in the system, starting “dry” will instantly destroy the piston group.
- 📉 Pressure gauges — the main tool for assessing system performance.
- 💻 Scanner allows you to see the operating logic of the control unit and errors.
- 🔌 Electric circuit should be checked with a multimeter for voltage.
Selection of original spare parts and analogues
When choosing a new compressor for Nissan Murano Z52 There are two main ways to consider: purchasing an original part or high-quality analogues. The original compressor is marked with a number 92600 with subsequent numbers that depend on engine size and year of manufacture. It ensures exact compliance with factory parameters and a long warranty.
Analogues from manufacturers Denso, Sanden or Delphi are often original equipment manufacturers (OEMs). This means that the original box may contain exactly their products. However, there are many fakes on the market, so it is important to check the packaging, holograms and the quality of the case molding. Cheap Chinese brands often have an underestimated service life and require replacement after just a year.
Be sure to pay attention to the type of oil that is poured into the compressor. For systems Nissan synthetic oil is used PAG 46 or PAG 100. If you purchase a compressor "dry" (without oil), it must be filled with the correct volume before installation. Mixing different types of oils is unacceptable and will lead to failure of the entire system.
| Manufacturer | Type | Average cost | Features |
|---|---|---|---|
| Nissan (OEM) | Original | High | Perfect compatibility, long service life |
| Denso | Analogue (OEM) | Average | Quality like the original, often cheaper |
| Four Seasons | Analogue | Average | Good quality, reliable reputation |
| Budget brands | Analogue | Low | Risk of low resource and defects |
When purchasing, also check the package contents. The kit often includes new mounting bolts, gaskets and plugs. The use of old bolts, especially if they were tightened with force, can lead to their breakage during installation. Completeness supply is an important criterion when choosing.
What is a turnkey compressor?
A turnkey compressor is a unit that is already filled with oil and refrigerant, ready for immediate installation. However, this is not always suitable for a vehicle system, as evacuation and refueling may be required. Typically sold are “dry” compressors that require preparation.
Buying an original compressor or a certified analogue from Denso is the best solution for long-term operation of the Nissan Murano Z52 air conditioning system.
The compressor replacement process and important nuances
Replacing the compressor with Nissan Murano Z52 - a labor-intensive procedure that requires special equipment and skills. The first step is the complete evacuation of freon from the system through a pressure gauge station. It is strictly forbidden to simply open the valves, as this pollutes the atmosphere and violates environmental standards.
After turning off the system, it is necessary to remove the protective elements of the engine compartment, which may interfere with access to the compressor. On the engine VQ35DE or VQ35HR access is often limited to the radiator and bumper, which may require partial removal. Disconnect the electrical connectors and service pipes, first closing the openings with plugs to prevent moisture and dirt from entering.
Remove the drive belt by loosening the tensioner. Unscrew the compressor mounting bolts and carefully remove it. When installing a new unit, make sure that all gaskets and O-rings are replaced with new ones. The bolts must be tightened to a certain torque specified in the service book to avoid distortion of the housing.
Момент затяжки болтов крепления компрессора: 25–30 НмAfter installing a new compressor, it is necessary to evacuate the system for at least 30-40 minutes. This will remove any air and moisture remaining in the circuit. Only after this can you charge the refrigerant and oil in the exact volume. Do not skimp at this stage, as moisture is the main enemy of the compressor.
Before installing a new compressor, flush the system with a special flush if the old unit was destroyed from the inside, otherwise the remaining chips will damage the new compressor in a few days.
- 🔩 Dismantling requires care not to damage adjacent tubes and sensors.
- 🌬️ Vacuuming - a mandatory step to remove moisture and air.
- ⚖️ Refueling must be carried out strictly according to the scales specified in the documentation.
⚠️ Attention: If you have replaced the compressor due to its destruction, be sure to replace the receiver-dryer and dehumidifier filter. The old filter will allow moisture and wear particles to pass into the new compressor.
Do I need to replace the capacitor when replacing the compressor?
If the compressor has collapsed inside and scattered chips, the condenser (air conditioning radiator) is often impossible to properly rinse. In such cases, it is recommended to replace it, since the narrow channels of the condenser become a place for contaminants to accumulate.
Why is it important to change your filtration and drying system?
Many owners Nissan Murano Z52 They make the mistake of replacing only the compressor itself and leaving the old filtration system. If the cause of the failure was the mechanical destruction of the pistons, then microparticles of metal scattered throughout the entire circuit. They settle in narrow channels, the filter drier and the expansion valve.
The receiver-dryer contains a desiccant element and a filter. If it is clogged with wear products, the flow of freon will be disrupted, which will lead to overheating of the new compressor and its repeated failure. Replacing this cheap component saves thousands of dollars in the future and ensures a long system life.
It is also worth checking the condition of the high pressure pipes. Sometimes they have microcracks through which leakage occurs, especially at the joints. A visual inspection for oil traces will help identify weak spots. Be sure to replace the O-rings on all connections, as old O-rings lose their elasticity and tightness.
Complete cleaning of the system and replacement of all filter elements is the key to ensuring that the new compressor will serve for many years without problems.
FAQ: Frequently asked questions about the Nissan Murano Z52 compressor
How much does it cost to replace the air conditioning compressor on a Murano Z52?
The cost of service work varies from 15,000 to 25,000 rubles, including diagnostics, removal/installation, evacuation and refilling with freon. The price greatly depends on the region and the complexity of access to the unit.
Is it possible to repair an old compressor?
Repairing Nissan Murano Z52 compressors is technically possible, but not economically feasible. The cost of spare parts for repairs is often close to the price of a new analogue, and the service life of a restored unit is unpredictable.
How often does the freon in the system need to be changed?
In a sealed system, freon is not consumed and only needs to be changed in the event of a leak or when replacing components. However, it is recommended to check your blood pressure every 2-3 years for prevention.
What happens if you turn on the air conditioner with a faulty compressor?
If the compressor seizes, the belt may burn or break. If it works intermittently, this will lead to overheating of the system and destruction of internal parts, which will complicate and increase the cost of subsequent repairs.
How do you know when the compressor is turning on?
When the air conditioner is turned on, the A/C icon should light up on the instrument panel. You will hear a characteristic click of the clutch, and the compressor pulley will begin to rotate along with the shaft. Also, the temperature of the air from the deflectors will begin to decrease within a few seconds.