Air conditioning system in a car Nissan Terrano is a complex engineering unit that requires precise adherence to technological parameters during maintenance. The key factor for the effective operation of the air conditioning system is not only the serviceability of the compressor and the cleanliness of the radiators, but also strict adherence to the amount of refrigerant in the circuit. Refrigerant volume - this is a value that is not subject to arbitrary adjustment, since a deviation from factory standards of even 10-15% can lead to critical consequences for the entire system.
Many car owners mistakenly believe that the air conditioner can be “topped up” by eye or by the pressure in the hoses, but this is a grave mistake. For model Nissan Terrano the manufacturer has pre-calculated the optimal amount of freon and oil required for operation in various climatic conditions. Improper refueling can result in either insufficient cooling of the cabin or water hammer and failure of an expensive compressor. In this article we will examine in detail the technical standards, types of refrigerants used and features of the maintenance procedure.
When diagnosing malfunctions of the climate system, it is important to understand that the absence of cold does not always mean a gas leak. Often the problem lies in incorrect operation of the condenser fan, contamination of the heat exchanger or malfunction of pressure sensors. However, check amount of freon remains the first and mandatory step when troubleshooting cooling problems. If you are planning on doing your own diagnostics or refueling, you need to have specialized equipment and accurate data on your version of the car on hand.
Types of refrigerants and their characteristics for Nissan Terrano
Depending on the year of manufacture and market specification, the car Nissan Terrano can be equipped with air conditioning systems operating on different types of refrigerants. For models manufactured before 2015-2017, the standard is the use of freon type R134a. This substance has excellent thermodynamic properties and has been widely used in the automotive industry for several decades. Its use requires specific sealants and oils compatible with its chemical composition.
Newer models, especially those intended for markets with strict environmental regulations (Europe, some regions of Asia), may be equipped with a refrigerant-based system R1234yf. This type of freon is more environmentally friendly as it has a significantly lower global warming potential (GWP). It is important to note that refueling the system R134a freon R1234yf and vice versa is strictly prohibited due to differences in pressure and types of compressor oil used. Mixing these substances will lead to the destruction of seals and failure of the entire system.
To determine the type of refrigerant your vehicle requires, you must refer to the technical documentation or look at the information plate under the hood. It is usually located on the body pillar or in the radiator area. It clearly states: Type: R134a or Type: R1234yf, as well as the required filling volume in grams. Using the wrong refrigerant may void your air conditioning system's warranty and result in costly repairs.
- 🌡️ Freon R134a - standard gas for most models Nissan Terrano until 2017 release.
- 🌍 Refrigerant R1234yf - a modern environmentally friendly standard for new generations and European specifications.
- 🛑 It is prohibited to mix different types of gases even in small quantities - this destroys the system.
⚠️ Attention: Never try to determine the type of refrigerant by the color of the fittings or the pressure in the system without specialized equipment. An error in the choice of gas will lead to a chemical reaction inside the circuit, sludge formation and complete inoperability of the air conditioner.
Why can't R134a and R1234yf be mixed?
Mixing these gases leads to changes in pressure in the system that standard components cannot withstand. In addition, the oils for these types of refrigerants are incompatible, which causes sedimentation and clogged filter drier.
Exact filling rates and technical data
One of the most important parameters during maintenance is the exact amount of refrigerant. For Nissan Terrano this figure may vary slightly depending on the body type (standard or extended version), the presence of rear climate control and engine type. However, there are basic factory standards that need to be followed. On average, for most configurations the refill volume ranges from 450 to 550 grams.
Critical System pressure is a variable value that depends on the ambient temperature, engine speed and compressor load. Refrigerant mass is a constant that must be strictly observed. The use of weigh filling stations is the only correct filling method to guarantee the longevity of the system. If you use cheap cylinders with pressure gauges, you will not be able to control the exact amount of gas introduced.
Below is a table with approximate data on filling volumes for various modifications Nissan Terrano. Please note that this data may be clarified in the service book of a specific vehicle.
| Car modification | Refrigerant type | Refill volume (grams) | Oil type (PAG) |
|---|---|---|---|
| Nissan Terrano (2.0L, before 2017) | R134a | 480 ± 20 | PAG 46 |
| Nissan Terrano (1.5L Diesel, 2014-2020) | R134a | 500 ± 20 | PAG 46 |
| Nissan Terrano (2.0L, Europe, 2017+) | R1234yf | 490 ± 20 | PAG 46 (special) |
| Nissan Terrano with rear climate control | R134a | 530 ± 25 | PAG 46 |
⚠️ Attention: The values indicated in the table are for reference only. Before starting work, be sure to check the nameplate under the hood of your vehicle, as there are exceptions depending on the country of assembly and year of manufacture.
In addition to the refrigerant itself, the amount of compressor oil plays a critical role. When replacing system components or completely refilling, it is necessary to remove old oil and add new oil in a strictly defined volume. If there is too much oil, this will lead to oil starvation of the compressor and its jamming. If there is not enough oil, the heat exchangers will clog and cooling efficiency will drop sharply. Oil quantity should compensate for its losses when replacing parts.
- By weight on special. stations
- By pressure on manometers
- By refueling time
- I don’t know, I trust the service
Preparation for the refueling procedure and necessary tools
Before you start working with the air conditioning system, you need to prepare a workplace and a tool kit. For quality service Nissan Terrano you will need a gas station (or at least a pressure gauge station with a scale), a vacuum pump and a set of wrenches to connect the hoses. If you plan to carry out the work yourself, make sure that you have access to professional equipment, since household cylinders with adapters do not provide dosing accuracy.
An important stage of preparation is a visual inspection of the system. Check the condition of the pipes, rubber seals and high and low pressure pipes for cracks, abrasions and traces of oil. Presence of oil stains anywhere in the circuit indicates the presence of a leak that must be repaired before refueling. Trying to charge a system with an active leak will not only fail, but will also result in the loss of expensive refrigerant and oil.
It is also necessary to ensure that the electrical part of the system is in good working order. Check fuses, compressor relay and condenser fan operation. If the fan does not rotate, the compressor will not turn on and the pressure in the system will not increase, which can be misleading in diagnostics. Before connecting the gauges, be sure to turn off the engine and open the hood to allow easy access to the service ports.
- 🛠️ Manometric station with a precise dispenser or scales to control the mass of the refrigerant.
- 🔧 Vacuum pump to remove air and moisture from the system before refueling.
- 🔍 Flashlight and mirror for inspecting hard-to-reach places and searching for traces of leaks.
☑️ Preparing to refill the air conditioner
Procedure for vacuuming and charging the system
The process of refilling the air conditioner Nissan Terrano begins with evacuating the system. This is a critical step that is often ignored by newbies. Air and moisture remaining in the circuit after repairs or prolonged use can lead to ice formation in the evaporator and corrosion of internal parts. The vacuum pump must be connected to the system and run for 15-20 minutes to achieve a deep vacuum (usually up to 500 microns or 0.05 bar).
After successful evacuation, the system is ready for charging. Connect the refrigerant hose to the low pressure port (usually the blue cap L). Start the gas station and carefully monitor the scale readings. Add refrigerant until the value specified in the technical data is reached (for example, 480 grams). Refueling by weight This is the only reliable way to guarantee the correct operation of the system. In this case, pressure will be a secondary parameter, which only confirms the correctness of the process.
Once refueling is complete, disconnect the hoses and start the engine. Turn on the air conditioner at maximum power and check the temperature of the air leaving the vents. Ideally, on a warm engine with an outside air temperature of about 25-30°C, the outlet temperature should be 5-8°C. Also check the operation of the compressor: it should turn on and off cyclically, maintaining the set temperature.
During the refueling process, precautions must be taken. Refrigerants are under pressure and can cause frostbite to the skin upon direct contact. Also avoid getting the gas in your eyes. Work in a well-ventilated area, as the gas is heavier than air and can accumulate in low areas, displacing oxygen. Safety at work with freon should be in first place.
Before starting evacuation, check that all valves on the pressure gauge station are closed to prevent accidental release of refrigerant into the atmosphere when connecting hoses.
Leak diagnostics and leak testing
If after refueling the air conditioner stops cooling after a short time, the reason most likely lies in a leak. Leaks can occur at pipe connections, on compressor seals, in the condenser radiator (especially after stones have entered) or in the evaporator. To search for leaks on Nissan Terrano Various methods are used: from visual inspection with a fluorescent dye to the use of electronic leak detectors.
The most effective method is to use a fluorescent dye. A small amount of a special substance is introduced into the system along with the refrigerant. After operating the air conditioner for 10-15 minutes, using an ultraviolet lamp, you can see the leak, where the gas comes out along with oil and dye. This method allows you to find even microscopic cracks that are not visible to the naked eye. Exact location of the leak must be secured for future repairs.
Electronic leak detectors are also widely used in service centers. They react to freon vapors and signal with sound or light when approaching the leak. However, such devices require calibration and may give false alarms in the presence of other gases. The “soap bubble” method is also used to test leaks, which is effective for detecting large leaks at joints, but is useless for finding microcracks in pipes.
- 🔦 An ultraviolet lamp and fluorescent dye are the best method for finding hidden leaks.
- 📡 Electronic leak detector is a quick way to check connections and seals.
- 🧪 Soap solution is a simple and cheap method for checking threaded connections.
⚠️ Attention: If you find a leak in the evaporator (located inside the dashboard), repairs will require complete disassembly of the front panel of the cabin. This is a labor-intensive job that is best left to professionals.
Common mistakes when servicing an air conditioner
Car owners often make a number of common mistakes when trying to service the air conditioning system themselves. One of the most common problems is ignoring the vacuum step. Many people think that it is enough to simply release the old gas and fill in the new one. This causes moisture to remain in the system, oxidizing the oil and forming acids that destroy the compressor from the inside. Ignoring vacuum - this is the right path to a complete overhaul of the system.
Another common mistake is mixing different types of oils or using the wrong oil. For example, the use of mineral oil in a freon system R134a (where synthetic PAG oil is required) will cause the oil to not circulate and the compressor to seize. It is also unacceptable to use oil that does not correspond to the viscosity grade specified by the manufacturer. Oil type must strictly correspond to the type of refrigerant.
Some owners try to “additionally” charge the system, believing that the more gas, the better the cooling. This misconception leads to an increase in pressure in the system above critical values, activation of emergency valves or rupture of pipes. The compressor operates at the limit of its capabilities, which reduces its service life significantly. Excess refrigerant just as harmful as its deficiency.
Proper maintenance of an air conditioner is not just refilling gas, but a set of procedures: evacuation, checking for leaks and monitoring the amount of oil. Neglecting any of these steps reduces the reliability of the system.
FAQ: Answers to frequently asked questions from Nissan Terrano owners
How many times a year does the air conditioning on a Nissan Terrano need to be recharged?
If there are no leaks, the air conditioning system is sealed and does not require regular addition of refrigerant. Refilling should only be done if a leak is detected or after repair of system elements. If you notice that the air conditioner has become less cool, this is a signal of a malfunction, and not of scheduled maintenance.
Is it possible to use universal freon cylinders for self-refilling?
The use of universal cylinders with pressure gauges is highly discouraged. They do not allow you to control the exact weight of the gas being filled, which can lead to overfilling or underfilling. In addition, such kits often lack high-quality filters and dehumidifiers, which can introduce moisture and dirt into the system. It is better to contact a service with specialized equipment.
How can you tell if the system is low on refrigerant?
The main symptom is the absence of cold air from the deflectors even when the air conditioner is turned on. There may also be a lack of cyclic activation of the compressor (no characteristic click or change in the sound of the engine is heard). In some cases, the air conditioning system malfunction indicator may light up on the dashboard if the pressure sensors have detected a critical deviation.
Do I need to change the filter drier when refueling?
It is recommended to change the filter drier every time the air conditioning system is opened (for example, when replacing a compressor or condenser). If the system is simply refilled without disassembly, replacement is not necessary, but if the filter service life exceeds 5-7 years, its replacement is advisable to ensure system reliability.
Does air temperature affect the efficiency of an air conditioner?
Yes, the efficiency of the air conditioner directly depends on the ambient temperature. At very high temperatures (above 35-40°C) the system is pushed to its limit and the temperature difference may be less than expected. In addition, at very low temperatures (below +5°C), the compressor can be switched off by a protection system to prevent icing of the evaporator.