With the onset of the hot season, comfort in the cabin becomes not just a desire, but a necessity, especially for those who spend a significant part of the day behind the wheel. Installation of air conditioning on the carThe PV system, which was not originally equipped with a climate system, is a complex technical procedure that requires a deep knowledge of the design of cars and work with refrigerants. Many owners mistakenly believe that it is enough to simply connect a ready-made kit, but reality dictates its conditions: tightness, the correct electrical circuit and an accurate calculation of the load on the engine are necessary.
The modern market offers many solutions, from universal kits to specific systems for specific models. However, regardless of the chosen path, the modernization process always involves interference with the design of the vehicle. Integration of new nodes It must be carried out in compliance with all technical regulations to avoid problems with warranty or, worse, with driving safety. In this article, we will discuss in detail all aspects that must be considered before starting work.
It is important to understand that the climate system is a closed loop of high pressure, where the slightest error in the assembly can lead to failure of an expensive compressor or even to an emergency. Therefore, the approach of “do on the knee” is absolutely unacceptable here. Professional installation It guarantees not only the cold in the cabin, but also the durability of all units, as well as the absence of extraneous noise and vibrations, which often haunt poorly installed systems.
Selection of equipment and components for installation
The first and perhaps most important stage is the competent selection of components. The market is full of offers, but not all of them are of equal quality. The basis of the whole system is compressorwhich may be piston, rotary piston or spiral. For passenger cars, compact models with an electromagnetic clutch are most often used, although in modern systems it is increasingly common. compressor, working all the time.
Equally important is the choice of a condenser (air conditioner radiator) that should effectively remove heat. Its dimensions and shape must allow fitting into the front bumper or in front of the main engine cooler without disturbing aerodynamics. EvaporatorThe squat is selected based on the available space for the torpedo, and often requires the completion of plastic elements of the interior.
- 🚗 Type of compressor: Choose models with a performance corresponding to the cabin volume of your car to avoid engine overload.
- ❄️ Tubular material: It is preferable to use aluminum tubes with rubber inserts or fully copper lines that are resistant to vibration.
- ⚙️ Package: Make sure that the set has all the necessary fittings, brackets of attachment and electrical wiring with fuses.
Particular attention should be paid to the management system. Simple mechanical buttons are a thing of the past, giving way to the past. electronic control unitswhich can be integrated into the standard instrument panel. This allows you to control the temperature and speed of the fan more accurately. When choosing a set, be sure to check the availability drainerIt removes moisture from the system and filters the refrigerant.
⚠️ Never use components intended for stationary systems or refrigerators in cars. They are not designed for the constant vibration and temperature changes characteristic of the operation of the vehicle.
The price of the issue directly depends on the brand of components. Chinese analogues can cost much cheaper than the original systems Denso or SandenBut their resources are often unpredictable. Savings on key nodes can lead to the fact that after a season you have to redo all the work, which will eventually cost more.
Necessary tool and workplace preparation
Quality air-conditioning It is not possible without a specialized tool. A regular set of wrenches here will not be enough. You will need a station for filling freon with a vacuum pump, a gauge collection, a leak detector and a tool for rolling tubes. Presence vacuum-pump It is critically important, since before refueling the system must be completely free of air and moisture.
The workplace should be well lit and ventilated. Since work is often done under the hood and in the cabin, ensure access to any points of the car. To dismantle the torpedo and plastic panels, a set of filmmakers is needed to avoid damaging the clips. drill with a set of drills on metal will be needed for laying new holes under the highway and fastening the brackets.
Don’t forget to prepare personal protective equipment. Freon, although not toxic in small amounts, can cause frostbite when in contact with the skin, and when heated to high temperatures, it releases harmful substances. Electrical work requires a tester or multimeter to check the circuits and the correct selection of the wire cross section.
- 🛠️ Tool for rolling: It is necessary for the creation of sealed connections of copper or aluminum tubes.
- 🔋 Multimeter: to check the voltage, integrity of the circuits and the correct operation of the relay.
- 💨 Vacuum pump: It is mandatory to remove air and moisture from the circuit before refueling.
It is also worth purchasing consumables in advance: clamps, insulation, corrugated wires, sealant for the body and, of course, compressor oil. The type of oil must be strictly in accordance with the type of freon used (PAG for R134a or POE for R1234yf. Mixing oils of different types is strictly prohibited, as this will lead to the formation of acids and the destruction of the system from the inside.
⚠️ Attention: Before drilling holes in the body, be sure to treat the edges with an anti-corrosion composition. Open metal in the passageways of highways is a hotbed of future corrosion, which can destroy the body in a few years.
☑️ Preparation for installation
Stages of installation: mechanical part and installation in the cabin
The installation process begins with the installation of the compressor on the engine. For this purpose, a special bracket is selected or manufactured, which rigidly fixes the unit. It is important to ensure the right tension of the drive belt: too weak will lead to slippage, and too strong will lead to rapid wear of bearings. Compressor squeak It should be in the same plane with the pulleys of the crankshaft and generator.
Next comes the most time-consuming stage - installing an evaporator in the cabin. This often requires partial or complete removal of the front panel (see below).torpedo). The evaporator is mounted in the air box or attached separately, after which air ducts are brought to it. The tightness of the connection of ducts with the evaporator is the key to effective work, otherwise the cold will go into the bowels of the dashboard.
Laying the highways from the evaporator to the condenser and compressor requires accuracy. The tubes shall not touch moving parts of the engine or sharp edges of the body. To pass through the firewall (engine compartment partition), a hole is drilled, which is then sealed with a rubber sealer. condenser It is installed in front of the main cooling radiator, and it is important to leave a gap for air passage.
| Component | Place of installation | Features of installation |
|---|---|---|
| compressor | Engine (bracket) | Precise alignment of pulley, belt tension |
| condenser | In front of the radiator | Provide airflow, protection from stones |
| Evaporator | Salon (behind the torpedo) | Hermetic condensate removal, noise insulation |
| Receiver dehumidifier | Engine bay. | Vertical position, availability for replacement |
The removal of condensate (water) from the evaporator is a critical point. The drainage tube should be drawn outward so that water drips to the ground, and not into the cabin or onto electrical components. The angle of inclination of the tube should provide for a flow, otherwise moisture will remain inside, which will lead to mold and an unpleasant smell.
Why is the angle of inclination of the drainage tube important?
If the drainage tube has an upward bend or horizontal section, the water will stagnate in the evaporator pallet. This creates an ideal environment for the reproduction of bacteria, which, when turned on by the fan, will spread spores around the cabin, causing allergies and a persistent smell of dampness. In addition, overflowing of the pallet can lead to water leaking onto the driver's mat.
Electrical circuit and connection of the control system
The electrical part of the air conditioner installation requires no less attention than the mechanical part. The compressor consumes a significant current, so the wiring must be done by a wire of the appropriate cross-section, usually at least 2.5 mm2 for the supply chains of the clutch. All chains must be protected. safety-guardThe value of which is calculated based on the current consumed by a particular equipment.
The compressor is controlled through the relay. The signal on the relay can be given from a button in the cabin, but in more complex systems it is tied to the operation of the engine. For example, with a sharp acceleration (mode) kick-down) or when the starter is in operation, the application of voltage to the compressor coupling shall be stopped so as not to take power away from the engine.
- ⚡ Pressure relay: Be sure to install a pressure sensor that will turn off the compressor when the pressure in the system is critically increased or decreased.
- 🌡️ Temperature sensor: prevents the inclusion of the air conditioner at too low temperature of the evaporator, protecting it from freezing.
- 🔌 Quality of contacts: All connections must be soldered or made through high-quality terminals, twists in the car are unacceptable.
Integration with a modern car may require a connection to a CAN bus. This allows you to display information about the operation of the air conditioner on the display of the on-board computer and synchronize the climate with other systems of the car. However, for universal sets, autonomous wiring with the output of a separate control button is more often used.
⚠️ Warning: When laying wires, avoid high temperature areas (output manifold) and places of possible friction. Use corrugated and heat-resistant insulation. Short circuit in the wiring of the air conditioner can lead to a fire of the car.
Electrical checks are carried out before the compressor is started. Make sure the clutch clicks when the voltage is applied, the condenser fan is switched on at the same time as the compressor, and there is no heating of the wires anywhere. Stability of voltage In the on-board network when the load is turned on - another parameter that is worth checking.
Vacuuming, refueling and testing of the system
After assembling all mechanical and electrical components, the most important stage comes - vacuuming. The system is connected to the vacuum pump, and air is pumped out of it for 30-60 minutes. This is necessary to remove moisture, which, when hit by the contour with freon, turns into ice and can block the work. heat-control (TRV) or cause corrosion.
After vacuuming, the system is checked for leakage. Pressure is left for several hours (or overnight) and the pressure gauges are monitored. If the arrow crawls up, then there is a leak somewhere, which must be found with a leak detector or soap solution. Only after making sure of complete tightness, you can start refueling.
Refueling is carried out strictly by weight specified in the equipment specification. Excess freon will lead to increased pressure and inefficient operation, and the lack of it will lead to insufficient cooling. Freon is refueled in the liquid phase (balloon upside down) or in the gaseous (balloon up), depending on the manufacturer's recommendations, but always through the low side of the circuit with the compressor off.
When you first refuel, add a small amount of fluorescent oil to the system. In the event of a future leak, it can be easily detected with an ultraviolet lamp, even if there are no visual traces of oil.
Testing of the system is carried out on the working engine. Turn the air conditioner on the maximum cooling mode and the minimum fan speed. After 5-10 minutes of work, measure the air temperature at the exit of the deflectors. For a functioning system, the temperature in the range is considered normal. +4...+8°C. Also check the capacitor fan: it should be turned on when pressure increases.
The quality of the vacuum and the accuracy of the filling by weight determine 90% of the success of the entire operation. The time savings at this stage are guaranteed to lead to the breakdown of expensive equipment in the near future.
Typical errors and maintenance of installed air conditioner
Even with high-quality installation, errors are possible that manifest themselves during operation. One of the most common is the insufficient performance of the condenser fan. If the radiator is not blown properly, the pressure in the system rises and an emergency shutdown is triggered. Also often there is an incorrect drainage laying, flowing water into the cabin.
Maintenance of the installed air conditioner consists in periodic check of tension of the belt, cleaning of the condenser from down and dirt (especially after winter and spring) and replacement of the cabin filter. Every 2-3 years it is recommended to change drainerBecause its moisture absorption capacity is limited, even if the system is sealed.
If you notice a decrease in cooling efficiency, the appearance of a whistle when turned on or foreign smells, do not ignore these signals. Timely diagnosis will help to avoid expensive repairs. Regular TO It extends the life of the system and maintains its effectiveness for many years.
- 🧹 Cleaning the condenser: wash the air conditioner radiator carefully, with a stream of water under low pressure, so as not to bend the lamellae.
- 🔍 Visual examination: Check the tubes regularly for oily spots that indicate micro-leaks of Freon.
- 🔄 Prevention: turn on the air conditioner for 5-10 minutes at least once a week, even in winter, so that the lubricant circulates through the system and the glands do not dry out.
Remember that self-installation of air conditioning is a risk, but with the observance of technology and the use of quality components, the result is worth it. Comfort on a hot day fully pays for the effort and money spent.
Frequently Asked Questions (FAQ)
How long does it take to install a professional air conditioner?
On average, the installation of a universal air conditioning kit in a specialized service takes from 8 to 12 working hours. This includes dismantling of cabin elements, installation of equipment, laying of highways, soldering/walling, vacuuming and refueling. If complex bodywork or individual production of brackets is required, the period can be increased to 2-3 days.
Will fuel consumption increase after air conditioning is installed?
Yes, fuel consumption will inevitably increase, as the compressor takes power from the engine. On average, the air conditioner increases fuel consumption by 0.5-1.5 liters per 100 km in the urban cycle and up to 10-15% on the road. However, modern compressors with variable performance allow you to minimize this effect.
Can I install air conditioning on an old car with a carburetor engine?
Technically, this is possible, but requires the installation of additional relays and possibly upgrades to the ignition system to compensate for the drop in revs when the load is turned on. On carburetor cars often set increased idling speed when the air conditioner is working, so that the engine does not deafen.
How often should I fill the air conditioner with Freon?
A proper air conditioning system is sealed and does not require regular refueling. Natural leakage is about 5-10% per year, so total loss of efficiency usually occurs once every 3-5 years. If Freon leaves faster, there is a leak in the system that needs to be found and fixed.