Volvo air conditioner expansion valve inspection

It was found that the air conditioner was no longer cooling. The main reason for this is that after a long period of deactivation, the refrigerant of the air conditioner has been drained, and the problem can be solved by replenishing the refrigerant.

There is still a big gap between the refrigeration effect and the normal situation. So generally you only need to clean the air conditioner filter.

Cold air sinks and hot air rises, it's a simple physical principle. Therefore, the air outlet should be turned upwards to improve the cooling effect of the air conditioner.

Obviously cold gear, when the vehicle uses the air conditioner, there is a situation of hot air coming out of the air outlet, of course, this situation is relatively rare, and it is necessary to fill the filter on the surface of the evaporator with a special car air conditioning cleaning agent to solve the problem.

If you turn off the air conditioner after stopping, the air conditioner duct is prone to condensation, bacteria breed, and there will be a peculiar smell when the air conditioner is turned on again.

If the air conditioner is much louder than normal, it is likely that there is a problem with the air conditioner compressor. It is best to drive to the repair shop and ask a professional to solve it.

It is best to go to a 4S shop or a professional repair shop and repair it. We hope you enjoy your ride.

Low pressure, high pressure, low pressure, replace the compressor.

The pressure is high to exhaust, or there is a problem with heat dissipation.

There is water vapor in the table jitter system, and the evacuation must be more thorough.

The pressure is low and the refrigerant is low, otherwise the system will be blocked.

Hello, I'm glad to answer your question, your question is the maintenance of car air conditioner in several aspectsCar air conditioner can be mainly divided into several parts, one is the refrigerator, one is the refrigerant, and the other is the pipeline.

The first check is to check whether the refrigerant is missing or leaking, and if it needs to be replenished, the refrigerant should be replenished.

Secondly, check whether there is any leakage in the pipeline, and the damage can be replaced in time.

Finally, check the working condition of the refrigerator and whether there is a fault that causes the operation to stop.

The heating of automobile air conditioning mainly uses the heat of the engine, so the possibility of failure in this aspect is relatively small.

431 diagnostic computer, 5053 computer, 120 pieces of Skadden tool kit, jacks, multimeters, you can perform simple vehicle repairs with these tools.

Vacuum pump, pressure gauge, according to the type of air conditioner freon with the corresponding freon, connecting pipe.

1. Mechanical failure of the air conditioning system. To determine whether it is a compressor failure, it depends on whether the transmission belt is aged, cracked, loose or too tight, which affects the power transmission. The internal parts are damaged or worn, affecting the compression performance, which is manifested as abnormal noise inside the compressor.

The compressor gasket blow-by and intake and exhaust valves are damaged, which affects the compression performance.

2. The electrical circuit of the air conditioning system is faulty. Pressure sensors, temperature sensors, thermostats, compressor electromagnetic clutches, high and low pressure protection switches, expansion valves, temperature bags, etc.

3. Failure caused by refrigerant and refrigeration oil. Failure caused by refrigerant and refrigeration oil, maintenance method: Observe from the sight glass above the drying tank.

If you can't see a single bubble in the sight glass when the car air conditioner is running, and there are no bubbles after the compressor stops, it must be too much refrigerant. If too much refrigeration oil is added, cloudy air bubbles can be seen through the sight glasses when the air conditioning system is running normally. If there is indeed too much refrigerant, you can slowly release some at the maintenance port on the low-pressure side of the air-conditioning system.

4. Insufficient refrigerant, inspection method: insufficient refrigerant can also be observed from the sight glass above the drying tank, when the air conditioner is running normally, if there are continuous slow bubbles in the sight glass, the refrigerant is insufficient. If there is a significant bubble flipping, it means that the refrigerant is seriously insufficient.

When the automobile air conditioning system is repaired, in addition to the general tools, it is also equipped with some special maintenance tools. (1) General toolGeneral tool is the ordinary automobile maintenance tool, mainly has various kinds of wrenches, such as movable wrench, open-end wrench, plum wrench, pipe wrench, dull wrench, etc.; all kinds of screwdrivers, such as flathead screwdrivers, Phillips screwdrivers; All kinds of sweeteners, such as wire cutters, carp pliers, needle-nose pliers, electrician's pliers, etc.; Hammers, flashlights, and various drills and other tools. (2) Commonly used equipment is a multimeter, an electric soldering iron, a hand drill and acetylene-oxygen welding equipment.

3) The tools used in special tools and equipment generally include manifold pressure gauges, leak detection tools, refrigerant injection valves, vacuum pumps, refrigerant ** devices and other special tools. The main function of the manifold pressure gauge is to check and judge the working state and fault condition of the refrigeration system, which is composed of high and low pressure gauges, and there are three joints on it that are connected with three hoses respectively, and the refrigeration system is vacuumed, refrigerant is poured and other operations are completed respectively. The function of Freon leak detector is to check whether the refrigerant in the refrigeration system leaks, at present, there are mainly halogen leak detector lamps and electronic leak detectors, and the commonly used electronic leak detectors.

The function of the refrigerant injection valve is that when the refrigerant is poured into the refrigeration system, the injection valve can be installed on the refrigerant tank, and the valve pin can be filled with refrigerant when the refrigerant tank is pierced. After the vacuum pump is installed or maintained, before filling the refrigerant, the refrigeration system must be vacuumed with a vacuum pump, otherwise, the air and water in the refrigeration system can cause the pressure in the system to rise and the ice blockage at the expansion valve, and affect the normal operation of the refrigeration system. In addition to the above-mentioned tools and equipment, other maintenance tools also need tools such as pipe cutters, pipe benders, and pipe expanders.

Note: At present, there are two types of refrigerants used in automotive air conditioners: one is R12; The other is R134A.

They themselves and the refrigeration oil they use are many different in nature and cannot be miscible with each other, so the maintenance, testing and filling tools of these two refrigeration systems cannot be mixed, and must be used separately.

Car air conditioners are generally washed once every six months, because the accumulation of bacteria for a long time is easy to cause odor and other hazards. Therefore, it is recommended to wash the air conditioner every six months, and the You66 car air conditioner cleaner cleans more thoroughly than the traditional foam washing method. In addition, it is necessary to open the windows frequently for ventilation to allow harmful objects to escape.

Air conditioning. It does not require regular maintenance. Unless there is a fault, it will not involve repairs. Usually, as long as the air conditioner can cool normally. Only the cabin air filter needs to be replaced. Replace once a year.

The car's air conditioning compressor is broken and can be repaired. If it is an air conditioner compressor, the solenoid valve clutch coil can be replaced separately, and if it is damaged inside the compressor, it can only be replaced with a new one. You can ask professional maintenance personnel to test and repair according to the actual situation.

The air conditioning compressor, as the core part of the air conditioning and refrigeration system, plays a very important role in the operation of the air conditioner. Sometimes, the compressor of the air conditioner may break down due to the long use of the air conditioner or improper use.

Manifestations of a broken car air conditioning compressor:

1. The air conditioner is not refrigerated, when the air conditioner A C switch is turned on, the engine speed will not increase, if you don't need the air conditioner very much, then remove the belt of the compressor, and the power can be enhanced by more than half a gear, which has no impact on the car.

If the air conditioner compressor locks up, it will be scrapped. If it is bad, it is possible that the refrigerant is flooded or the oil seal is broken, causing the incompressible liquid to enter the compressor and cause damage to the piston. However, it is not common, and most compressors do not work mainly because of the electromagnetic clutch.

2. The exhaust valve is damaged, and the compressor electromagnetic clutch coil is burned, generally speaking, the compressor can only be replaced if the intake and exhaust valve is broken, and the compressor electromagnetic clutch coil can be replaced if it is burned. However, some unscrupulous manufacturers do not care about the good ones and treat the good ones as bad, so the replaced compressors should be sent to other maintenance manufacturers for verification.

3. The air conditioning compressor is broken, which will cause the air conditioner to not work or the refrigeration effect is poor, and the general obvious symptoms are that the compressor does not rotate, there is abnormal sound in rotation, abnormal pressure, low pressure, and low pressure.

4. The compressor of the air conditioner is not operated by electricity, but the engine gear or belt is used to drive the air conditioning compressor to rotate, and the compressor is idling when the air conditioner is not turned on.

5. After the air conditioning compressor is damaged, the additional power of the engine will be applied to unnecessary power.

6. After damage, the compressor is generally not repaired, but is directly replaced. Replacement is best to replace the original parts.

7. The probability is very small, if it is bad, it may be that the refrigerant enters the water or the oil seal is broken, resulting in incompressible liquid entering the compressor and causing damage to the piston. However, it is not common, and most compressors do not work mainly because of the electromagnetic clutch.

8. Common damage characteristics of compressors: shaft seal leakage, which is compressor leakage. Internal breakdown, resulting in inability to compress and not refrigeration. The clutch is damaged, causing the compressor to not work.

Under normal circumstances, small faults can be repaired, but if there are major faults, such as the need to replace large parts, it is better to consider replacing them.

Safety issues that should be taken care of when handling refrigerants:

1. Do not dispose of refrigerant in a confined space or near an open flame;

2. Protective glasses must be worn;

3. Avoid liquid refrigerant from entering the eyes or splashing on the **;

Fourth, do not put the bottom of the refrigerant tank against people, some refrigerant tanks have an emergency degassing device at the bottom;

5. Do not put the refrigerant tank directly in hot water with a temperature higher than 40;

6. If the liquid refrigerant enters the eyes or touches the eye, do not rub it, rinse it with a large amount of cold water immediately, and immediately go to the hospital to find a doctor for professional treatment, and do not try to deal with it yourself.

Hello! If the compressor has no pressure, please replace the new compressor directly, the maintenance is not cheap, and the effect is not good, it is very easy to cause leakage of refrigerant! If there is no refrigerant pressure, check if there is any leakage and repair it!

After repairing, please refill the refrigerant! Hope it helps! Have a nice ride!

Car questions, ask the car guru. 4S shop professional technician, 10 minutes to solve. 】

Question: Hello, I am 12 BMW x6 air conditioner compressor, can it be repaired, answer hello! If the compressor is broken, it is generally impossible to repair, especially the current variable displacement compressor, which can be repaired if only a solenoid valve is replaced.

Question: Can I replace the compressor suction cup if it is broken?

It can be repaired, and it is recommended to go to the car repair company for repair under the inspection of professional staff.

The air conditioning compressor plays the role of compressing and driving the refrigerant in the air conditioning refrigerant circuit. Air conditioning compressors are generally installed in outdoor units. The air conditioning compressor extracts the refrigerant from the low-pressure area and sends it to the high-pressure area for cooling and condensation after compression, and dissipates heat into the air through the heat sink, and the refrigerant also changes from gaseous to liquid, and the pressure increases.

The working circuit of the air conditioning compressor is divided into evaporation zone (low pressure area) and condensation zone (high pressure area). The indoor unit and outdoor unit of the air conditioner belong to the low-voltage or high-pressure area respectively (depending on the working status). The refrigerant then flows from the high-pressure area to the low-pressure area, and is injected into the evaporator through the capillary, and the pressure drops sharply, and the liquid refrigerant immediately becomes gaseous, absorbing a large amount of heat in the air through the heat sink.

In this way, the air conditioning compressor works continuously, and constantly absorbs the heat at one end of the low-pressure area into the refrigerant, and then sends it to the high-pressure area to dissipate into the air, which plays a role in regulating the air temperature.

Now that the weather is getting hotter and hotter, it is simply unbearable not to turn on the air conditioner while driving, which leads to the use of air conditioners more and more frequently. Car maintenance needs to be done regularly, and car air conditioning also needs to be maintained, especially in summer, when it is used frequently, good maintenance can ensure the normal use of air conditioning. So how should you maintain your car air conditioner in the summer?

In this regard, the maintenance master also gave solutions to several common problems.

What should I do if my car smells? If the car air conditioner is not used for a long time, it will also accumulate a lot of impurities, and it is easy to produce peculiar smells. Before officially using the car air conditioner, check the cleanliness of the air conditioner filter, if there are too many impurities, you need to replace the new filter element.

If you turn on the air conditioner and smell a bad smell, then you should check it step by step according to the steps below.

First look at the air inlet of the air conditioner to see if there is any foreign object blockage, it is also the rainy season, the air inlet and the front drain are not far away, it may be blocked by falling leaves or other impurities. Under the high temperature of baking, it is too normal to produce odors. If there is still an odor, then check the parts such as the air conditioner evaporation tank, air conditioner ducts, and blowers in turn.

So what's the reason for the poor cooling effect of air conditioners? The refrigeration effect of the air conditioner is poor, first of all, it depends on whether the condenser is blocked by impurities. The condenser is in front of the car, and impurities will attach to the condenser through the air intake grille, and there are many mosquitoes in summer, which will also clog the condenser, especially at night at high speed.

After that, it is necessary to look at the refrigerant of the car, which requires professional tools to check.

Why is there an abnormal sound when the air conditioner is turned on? Sometimes when you turn on the air conditioner, you will hear a strange noise, and you need to pay attention to it at this time. Air conditioning and refrigeration need the compressor to operate, and the reason for the abnormal noise is that the compressor is faulty, or the belt is aging and wearing, and it can no longer work normally.

Therefore, forced operation will produce abnormal noise, and at this time, the owner needs to repair it.

And when you usually use the car air conditioner, don't turn the temperature on too low, which will keep the compressor running at high load, which is not good for your health. Of course, if your air conditioner is automatic, this can be a bit more relaxing. In general, car air conditioners should be maintained while being used, and good driving habits are also a prerequisite for ensuring that the air conditioners are in good condition.