The air conditioning system is an integral part of any modern car... Thanks to the Conder, the driver and passengers are provided with comfort while driving in hot weather. But, like any other node, the Conder can fail. How to repair a car air conditioning compressor and what malfunctions are generally typical for the air conditioning system - read below.
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The main malfunctions of a car air conditioner
To begin with, consider the symptoms of Renault Megan malfunction two:
- When the Conder is turned on, the system does not work.
- Cooling appears and disappears.
- During the operation of the conductor, you can hear extraneous sounds, uncharacteristic for the work of the node.
Since by its design the air conditioning system is a rather complex unit, there can be quite a few reasons for its breakdown:
- The compressor of the Renault Megan 2 air conditioner is out of order. You can try to repair this element at home, this task is quite feasible. However, if the compressor unit does not show signs of life at all, it is quite possible that it will have to be replaced. You can find more detailed instructions on how to disassemble the compressor below.
- Air conditioner pipes clogged. Likewise, the problem may be that the air conditioner tubes are not sealed. If the tightness of the air conditioner pipes is broken, this will cause the pressure in the system to be too low, respectively, the condender will work very poorly. If possible, then it is necessary to restore the tightness, if not, then the tubes of the air conditioner are changed. In the event that the tubes are clogged, they will need to be cleaned.
- The air conditioner pressure sensor is out of order. Because of this, the pressure in the system will be incorrect, respectively, its normal work will be impossible. This problem is also solvable - if necessary, the controller can be replaced with a new one.
- The noise problem can be caused by the bearing of the air conditioner. Like any other element in the second Megan, the bearing is not eternal, therefore, over time, it can wear out. The problem will be solved by replacing the bearing of the air conditioner.
- Defective clutch.
- Problems in the operation of the air conditioner radiator. Replacing the radiator should be carried out if this unit is completely out of order.
- The device does not work due to wear on the drive strap. If there are signs of damage or defects on the belt, then it will also need to be replaced.
As practice shows, most problems can be avoided if the system is refueled on time. Refueling the air conditioner is an integral part of the scheduled maintenance of the air conditioning system. In fact, a filled Conder will work much more reliably. We have already written about this process. You can read more about how to refuel the system at home, what is needed for this and how to get rid of leaks, in this (video by Andrey Oliver).
DIY repair instructions
If extraneous sounds are observed during the operation of the device, then most likely the problem lies in the bearing.
It is not so difficult to change this element with your own hands, for this it is enough to follow these steps:
- First, open the hood and disconnect the battery, all electrical repair work must be carried out with a de-energized on-board network.
- After that, it is necessary to dismantle the power steering, having done this, you can remove the compressor. If the problem lies in the operability of the compressor device, at this stage it can be repaired or replaced. To replace the bearing it is necessary to unscrew the central nut on the compressor.
- Having done this, you can lubricate the clips and carefully unscrew the three bolts to prevent damage to the coupling.
- Using a special puller, the coupling can be removed from the bearing assembly.
- Next, a new oil seal is installed, further assembly steps are carried out in the reverse order.
As you can see, in general, the repair procedure is quite simple, no specific knowledge is required to complete it, it is enough just to follow the instructions. Be careful not to damage the device lines during renovation works, otherwise, problems in the operation of the node will continue.
Video "Dismantling a compressor in a Renault Megan car with your own hands"
More detailed instructions regarding the dismantling and disassembly of the compressor unit in the Renault Megan car is presented in the video below (the author of the video is the Anyutka channel).
Renault Megan has always been distinguished by its excellent equipment, so these cars were among the first to be equipped with air conditioning and climate control. The principle of the device automotive system air conditioning does not significantly differ from the classical one, therefore, in such systems, the compressor is a vulnerable point, which may require premature repair if the conditions of the scheduled Maintenance... Replacing high wear secondary parts avoids costly repairs.
Car climate control and its device
Until recently, its presence was a sign of its modernity, high cost and modernization. With help onboard system and sensors, climate control regulated humidity and air temperature. Its main task is to create comfortable conditions in the car, regardless of external weather conditions. As is known, modern models despite the preservation general principle, are able not only to cool the air, ventilate and maintain its humidity, but also to clean it from harmful impurities and microorganisms. Also, the air conditioner is responsible for heating the front, side and rear windows to save the overview.
And 2 were the lucky exceptions, whose owners could use technology almost before anyone else. At the moment, these systems already require serious repair, especially if maintenance was not carried out, as required in the note.
The climate control structure consists of an evaporator, a compressor, a condenser, an expansion valve, a drying tank, a blower, and a control unit with sensors.
The main element of the system is the compressor. Its functions include taking refrigerant from the evaporator and supplying it under pressure to the condenser. A high pressure builds up in the condenser, as a result of which the gaseous refrigerant becomes liquid and generates heat. Further, the liquid refrigerant passes through the expansion valve, where it is throttled at a pressure drop and again turns into a gas, at which point it absorbs heat. Cooled air is blown into the passenger compartment by a fan.
The most weak point the conditioner is a pulley bearing. Its wear is high, and this part requires replacement, since the bearing works together with the engine, that is, constantly. Determining its malfunction is quite simple, you will hear a characteristic engine compartment hum. The bearing will need to be removed and replaced with a new one, in which case the main components will not be damaged. A jammed part can lead to melted compressor seals and other troubles. Wear can lead to burning of the insulating varnish in the coupling winding. So the timely repair of Renault Megan climate control will help avoid serious difficulties in the future.
Timely maintenance is the key to inexpensive operation of climate control
So, your Renault Megan has a characteristic hum under the hood, and you need to repair it. In some "neglected" cases, it is necessary to immediately change the bearing, clutch and compressor. Only in this way will the operation of the air conditioner be restored. Let's figure out how to remove the bearing and do it without the help of masters.
Please note that more than 30 types of systems and 8 standard sizes of bearings are offered for sale. So before replacing, look at your model on the sticker and order the correct bearings for electromagnetic clutch... Most early models of Renault Megan air conditioners use SNR ACB35X55X20 419.06 or NSK 35BD219T12DDUCG21.
Sequence of work
- first you need to unscrew the power steering (hydraulic power steering), after which the compressor is removed;
- on the received part, the central nut is unscrewed;
- then it is necessary to lubricate (fill) the fasteners and carefully, so as not to damage the coupling, screw in 3 bolts with M6 thread;
- using a puller, the coupling is removed from the bearing;
- a new bearing is installed and reassembled.
After this operation, your will work silently and smoothly.
Compressor maintenance is carried out in order to check the parameters high pressure and other characteristics. Often these parts jam, for the reason described above. Sometimes the operation shown is quite enough to restore the system operation. If the damage is more serious, the compressors are not repairable, since they are of the rotary type.
You can determine the problem, whether it is a pulley or a compressor, as follows: you need to throw off the belt and turn the pump shaft by hand. If it does not jam, you need to change the pulley, if not, the compressor.
New climate control parts are installed in services, they can fail after 30-60 thousand km of run, especially if the bearings changed with a delay and other elements have worn out pretty much.
"Underwater rocks"
Sometimes the cause of a malfunction of the air conditioning system is hidden in the high-pressure tube, at the place of its attachment it collects all the dirt and "rot", under the influence of corrosion holes can form on it, through which the freon "leaves". Behind the engine, 2 pipes converge into the passenger compartment, the lower pipe is a high-pressure pipe. The air conditioner radiator is in front of the cooling radiator, the high pressure pipe goes to the bottom flange, there is a pressure sensor on it. 
In order to replace it, or to weld it, you will need to remove the wheel and the front part of the fender liner. For the convenience of work, you can also remove the bumper and radiator. In the place where the tube is attached, there is a clamp, and the nut - with inside, which will be easier to unscrew with a small ratchet.
Now unscrew the protection screws, and then you can unscrew the tube itself from the interior partition, engine compartment and a radiator. Further right side we start the tube (which is with a hose) behind the radiator pipe and, rotating, gently pull it out towards the wheel. Now it's up to you to brew the old one or replace it with a new one. The assembly is carried out upside-down.
The higher the temperature outside, the more car owners value the presence of an air conditioner in the car. Without it, riding with necessary level comfort in the summer is simply impossible.
However, if the system is not serviced in a timely manner, then just in the summer heat, the risk is highest of all to discover that it is faulty and does not cool the interior. vehicle with a sufficient degree of intensity.
In Renault Megan, the air conditioner has a rather complex device, and therefore only specialists can identify the cause of the malfunction. Maintenance work without sufficient qualifications in the absence of special equipment can easily exacerbate the problem.
Renault Megan air conditioner compressor and other causes of malfunctions
Most vulnerable node in the system 
air conditioning is a compressor. This is partly due to its wide functionality - it takes refrigerant from the evaporator and supplies it to the condenser under pressure. It is pressure that is one of the reasons that the wear of compressor parts is significantly higher than that of other elements of this system.
Compressor repair is complicated by its rather complicated device, therefore, if it completely fails, the car owner will inevitably face expensive repair work.
Renault Megan 2 air conditioner compressor: repair price
If it is not possible to repair individual compressor components, the replacement cost can be very expensive. The reason is expensive original spare parts and certain difficulties arising when dismantling the compressor.
However, the replacement of this part is required as a last resort. Timely repair or replacement of bearings and other components is often sufficient to extend the life of the compressor, avoiding costly repairs.
When to change the bearing of the air conditioner to Renault Megan 2
Most often, malfunctions of the air conditioning system this car connected to the bearing of the Megan air conditioner 2. High speed its wear is due to the fact that the operation of the bearing is carried out constantly together with the motor. It is possible to determine that the time for replacing the bearing has come by the characteristic noise.
Experts distinguish several stages of its manifestation:
Renault Megan 2 air conditioner compressor pulley: why untimely repairs are dangerous
Untimely replaced 
the bearing causes the following system damage:
- in the first stage, the compressor seals melt due to severe overheating of the system;
- further, due to wear, the insulating varnish in the winding of the electromagnetic clutch burns out;
- with such damage, there is a high risk of complete failure of the clutch, which significantly increases the cost of repairing the air conditioner compressor;
- overheating of the coupling, in turn, prematurely disables the compressor oil seal, which in the future often becomes a source of freon leakage and depressurization of the system.
Renault Megan 2 air conditioning compressor: repair associated with a freon leak
In the air conditioning system of any car, the lion's share of malfunctions is associated with depressurization of the system, and Renault Megane this is no exception.
Quite often the source 
leakage becomes a high-pressure tube, which in the place of its attachment is exposed to increased action of dirt and dust. As a result, corrosion occurs here faster than in other nodes, and therefore holes can literally form through which freon escapes.
Another source of leaks is the compressor. However, it is impossible to identify the exact place where the freon leaves, as well as to establish the very fact of its leakage from the system, without special equipment, and therefore in this case it is worth giving auto repairs to the hands of professionals.
To begin with, the pressure in the system is determined. If it does not correspond to the norm, then before refueling the system, a thorough diagnosis is shown in order to identify the source of the leak. In modern car services, it is usually done in one of two ways:
If it is established that the system has been depressurized, it is necessary to evacuate it. This will remove air and liquid from it that have accumulated there during the depressurization. If you don't, new renovation Renault Megan 2 air conditioner will be required very quickly.
Do not forget that in addition to monitoring the refrigerant level, it is also necessary to monitor the oil level in the system, since if there is a lack of it, the air conditioner parts will wear out faster and fail.
Renault Megane 2 is a comfortable city car with good technical characteristics and an excellent level of comfort.
This machine boasts a large number of electronic systems, among which the most popular is the air conditioning system, because it is on it that the climate in the car depends, and, accordingly, the comfort while driving.
The cooling system is one of the most repairable due to the complexity of its location. Let's take a look at the breakdowns and methods of repairing them.
The main breakdowns of the Renault Megane II air conditioner
Cars Renault They are distinguished by an excellent ratio of price and quality, for which many drivers in our country love them. To achieve a low price for these machines is obtained by reducing the cost of peripheral devices, which include air conditioning systems. The second generation Megan is equipped with air conditioners from Nissan cars sample of the early 2000s, which in many ways is a big disadvantage, leading to frequent breakdowns.
All breakdowns of the Megan 2 air conditioner should be divided into two large groups: mechanical and system.
Mechanical 
relate:
- loss of tightness due to wear of pipes, gaskets, seals;
- destruction of oil seals and hoses due to too much temperature difference;
- contamination of the honeycomb of the radiator located in front of the motor radiator;
- twisting or pinching of lines after accidents.
System breakdowns include electronics failures, leading to compressor breakdown, which often requires replacement.
In any case, the repair of the air conditioner or its individual parts should be carried out by professionals, who are the masters of our car service. We will not only help in troubleshooting, but also advise the client on how to avoid problems in the future.
Causes of breakdowns and their main symptoms
Air conditioners in the second generation Megan break down for two main reasons:
- dirt clogging into the compressor honeycomb;
- violation of the tightness and integrity of individual parts.
The Renault Megan air conditioner compressor is a rather fragile device with a small distance between the cells. Because the compressor of the Megan 2 air conditioner is installed in front of the main compressor of the motor, it is he who collects all the dirt and dust on itself 
roads, from which the distance between the cells decreases faster and the compressor needs to work more actively to maintain the set temperature in the cabin. After some time of such operation, the compressor overheats and is disconnected from overheating or from a short circuit inside the system, which will lead to the replacement of the compressor.
Violation of tightness and integrity occurs for three main reasons: accidents, time and sudden temperature changes. In case of accidents, hoses are pinched or kinked, obstructing the flow of refrigerant, from which the compressor does not withstand and is cut off from overheating.
The main symptoms of an air conditioner malfunction associated with a compressor in Renault Megane 2 are:
- Decreased performance levels. In this case, there may be a problem both in the clutch and in the leakage of freon.
- The appearance of a burning smell in the cabin after turning on the air conditioner. In this case, the air conditioner will not expel the air, because the breakdown is the Renault Megan 2 air conditioner compressor clutch, which simply did not start working.
- The appearance of a rotten smell - condensation is not removed.
- After charging the air conditioner with refrigerant, it quickly loses its performance - it does not cool. In this case, it is possible to diagnose the depressurization of the cooling system - pipes, hoses or seals.
- Noise during operation. The air conditioner is on the verge of breakdown and urgently needs diagnostics and repairs.
Time has a destructive effect on the plastic and rubber parts of the system, and sudden temperature changes accelerate the process of loss of their qualities by rubber and plastic elements, which leads to depressurization and loss of refrigerant.
Inspection and diagnostics of Renault car air conditioners
Any air conditioner should be diagnosed at least twice a year.
This is largely due to the fact that in our country there are sharp changes in temperature, which plastic and rubber components of air conditioners do not like, leading to a freon leak.
Diagnostics of the Renault air conditioner is carried out in several stages, including:
The Megan 2 car air conditioner is not without problems with the clutch - the most common breakdown. This element is always diagnosed separately for the presence of a click when the air conditioner is turned on. Click - the clutch clutch with the belt, if it happened, then the air conditioner is started. In rare cases, there is lye, but after a while the cabin starts to smell like smoke, which indicates problems with the bearing or clutch. In this case, the bearing of the compressor of the Renault Megan 2 air conditioner must be replaced.
Stages of repair of Renault Megan 2 car air conditioner
As in any other car, repairs can be carried out in different ways depending on the problem. If the integrity of the metal elements is violated, argon welding is used, if the gaskets and tubes dry out, they are replaced, if there is dirt, they are rinsed and 
cleaning, and in case of malfunctions in the electronics or in case of overheating, a local repair of one or another system is carried out.
In any case, the repair of an air conditioner in our car service consists of the following stages:
- inspection;
- diagnostics;
- performance checks;
- repair;
- performance checks after repair.
On Renault Megan 2, the air conditioner bearing in the event of its inoperability often 
is causing the device to malfunction. The Renault Megan 2 A / C compressor pulley requires similar attention.
Replacing the coupling and its bearing is carried out according to the following scheme:
- dismantling the power steering;
- dismantling the compressor;
- dismantling the central nut;
- removing the coupling from the bearing using a puller;
- installation of a new bearing and / or coupling;
- reassembly.
If the bearing of the Megan 2 air conditioner or the clutch of the device is faulty, it is dangerous to continue driving with the damaged part, therefore, you should immediately contact a specialized car service for replacement.
Basically, during the operation of the air conditioner compressor, the malfunction is the failure of the air conditioner clutch. Bearing 4 (Fig. 1) of the pulley begins to collapse.
The bearing can be destroyed due to excessive tension on the drive belt, water ingress, slippage of the pressure plate 1 (Fig. 1).
Due to the backlash of the bearing during rotation, the inner surface of the pulley begins to rub against the surface of the housing 10 of the electromagnet coil.
Under the action of friction, the parts heat up, and the insulation of the winding 8 (Fig. 1) of the coil begins to burn out, the turns of the coil of the electromagnet are closed and the electromagnet fails.
There are cases of complete seizure of the bearing and rotation of the inner race 5 of the bearing on the landing journal of the compressor cover.
When the compressor is running, pay attention to extraneous noise when the air conditioner compressor is running. If there is a suspicion, then you need to remove the drive belt from the pulley and turn the pulley by hand. It should rotate without noise or jamming. There should be no radial and axial play.
Removal and installation of the air conditioner compressor
To work, you will need tools: a wrench for 18 and a flat-blade screwdriver.
We prepare the car for work.
Remove the engine mudguard
Checking the status drive belt... We replace the belt if the following defects are found:
Wear of the jagged surface, cracks, undercuts, folds or peeling of rubber from the fabric;
Depressions, cracks or bulges on the outer surface of the belt;
Looseness or delamination on the end surfaces of the belt;
Traces of oil on the belt surface due to leaks in the engine shaft seals.
We squeeze out the clips and disconnect the block of wires from the block of the electromagnetic clutch for switching on the compressor.
We unscrew the bolts securing the flanges of the low and high pressure pipelines to the compressor.
We remove the bolts from the holes and disconnect the pipelines from the compressor.
After disconnecting the piping, plug the openings of the compressor and piping.
We unscrew the three bolts securing the compressor to the bracket on the cylinder block.
We take out the bolts from the holes and remove the compressor.
Install the compressor and all parts in reverse order
We remove the plugs of the compressor openings and pipelines just before the connection. Lubricate the new O-rings with oil for the air conditioning compressor.
When installing the belt, make sure that the V-grooves line up with the grooves of the pulleys.
We fill the air conditioning system. If a new compressor is being installed, you need to know how much oil is filled in the compressor and the type of oil.
