FEATURES OF THE HEATING, AIR-CONDITIONING AND VENTILATION SYSTEM DAEWOO NEXIA
DAEWOO NEXIA heating, air conditioning and ventilation system , which is equipped with the DAEWOO NEXIA, provides comfortable conditions in the cabin in any weather.
In order for the system to heat or cool the air, the vehicle's engine must be running.
DAEWOO NEXIA car interior ventilation system supply and exhaust type.
Block of the heating, air conditioning and ventilation system of the DAEWOO NEXIA car.
Fig.1. DAEWOO NEXIA heating, air conditioning and ventilation unit (view from removed panel instruments): 1- air supply box to the windshield blower nozzles; 2- air supply box to the left ventilation nozzle; 3- central upper air duct; 4- air supply box to the windshield blower nozzles; 5- air supply box to the right ventilation nozzle; 6- drive mechanism for air flow distribution dampers; 7- pneumatic hoses for controlling air flow dampers; 8- lever for actuating the temperature control damper; 9- air conditioner evaporator block; 10- housing of the climatic unit.
The air intake is located in the box in front of the windshield. The air flow occurs through the air intake due to the pressure of the oncoming flow and forcibly when the electric fan 6 (Fig. 2) of the heating, air conditioning and ventilation system is turned on.
Scheme of air movement in the heating and air conditioning unit of the DAEWOO NEXIA car : 1- damper heater/window blower; 2- top damper for air distribution; 3- heater heat exchanger; 4- damper of the air temperature regulator; 5- air conditioner evaporator heat exchanger; 6- fan electric motor (supercharger electric drive); 7- inlet damper; 8- lower air distribution damper; 9- air conditioner duct; 10- windshield blowing nozzles; 11- nozzle blowing side windows; A - the position of the damper for supplying air from the passenger compartment; B - damper position for outside air supply.
You can adjust the direction of air flow into the passenger compartment from the central and side ventilation grilles. Direct the air in the desired direction by moving the deflector levers left-right or up-down. The side vents can be opened and closed using the controls located next to them.
Exhaust ventilation of the body is carried out through deflectors with valves that are installed at the bottom of the rear doors. From the cavities of the rear doors, air exits through the end ventilation openings.
By car DAEWOO NEXIA the interior heating and ventilation system is controlled autonomously from the air conditioning system when performing the function of heating and ventilating the interior, removing frost and condensed moisture from the windshield, as well as blowing the door windows. At the same time, the main elements of the heater work even when the air conditioner is turned on. The heater units and the air conditioner evaporator heat exchanger are made in one block. The scheme of air movement in the heating and air conditioning unit is shown in fig.
heat exchanger (radiator) of the heater 3), designed to heat the air entering the cabin with the heat of the engine-cooling liquid;
Damper 4 for the air temperature regulator coming from the heater to the passenger compartment, the change in the position of which determines the amount of air passing through the heater heat exchanger and outside air passing bypassing the heat exchanger (the damper is located in the heating and air conditioning unit);
Flaps 1,2 and 8 for distribution of air entering the passenger compartment from the heater through the heater ducts or for blowing the windshield (the flaps are located in the heating and air conditioning unit).
Heating and air conditioning control panel: 1- handle for the fan operating mode switch; 2- button of the air recirculation mode switch; 3- air conditioner switch button; 4- handle of the air flow distribution regulator; 5- Handle of the air temperature regulator.
The illustration shows the control panel for heating and air conditioning in the passenger compartment, mounted on the instrument panel console.
Fan mode switch 1 (Fig. 3) operates regardless of the position of the air distribution and temperature regulators and controls the fan speed by changing the voltage in the electric motor power supply circuit.
The air distribution regulator 4 controls the heater dampers by means of a pneumatic drive, and the temperature regulator 5 is connected to the damper by a cable.
Air recirculation is controlled by switch 2.
It should be remembered that prolonged use of the recirculation system leads to the accumulation of respiratory products in the passenger compartment and the discomfort of passengers. Therefore, it is recommended to turn on the recirculation mode only if necessary, for example, when driving in areas with a smoky or polluted atmosphere. As soon as it is no longer necessary to isolate the vehicle interior from the atmosphere, turn off the recirculation mode. Do not use the recirculation mode in cold weather to prevent moisture condensation and ice formation on the windows.
The air conditioning system is controlled by a switch located on the panel 3.
The air conditioner does not turn on if the fan mode switch is set to "0" (fan off). This is by design and does not indicate a malfunction.
The air conditioning system is charged with refrigerant high pressure . Contact with liquid refrigerant on the skin of a person causes severe frostbite. Therefore, all work related to the maintenance, repair or dismantling of the elements of the air conditioning system should be carried out, if possible, in specialized service centers equipped with professional technological equipment. Take precautions when doing work on your own. Wear protective goggles.
Schematic diagram of the movement of refrigerant in an air conditioning system shown in Fig.4.
Schematic diagram of the movement of the refrigerant in the air conditioning system of the car DAEWOO NEXIA : 1- section of the high pressure pipeline; 2- condenser (air conditioner radiator); 3- condenser fan (air conditioner radiator); 4- pipeline section low pressure; 5- air conditioner compressor; 6- service valve of the low pressure line; 7- receiver; 8- heater fan; 9- evaporator; 10- throttle pipe; 11- high pressure line service valve; 12 - combined pressure sensor.
The air conditioning system includes the following elements.
Pulley Belt Driven Compressor crankshaft engine. A frictional electromagnetic clutch is built into the compressor pulley, which disconnects the compressor shaft from the pulley or connects them when the air conditioner is operating on a signal electronic block engine control. During operation, the compressor compresses the refrigerant vapor coming to it from the evaporator heat exchanger to high pressure. The temperature of the refrigerant vapor at the compressor outlet is much higher than at the inlet.
When the air conditioner is turned on, a click is heard - this clutch, under the action of an electromagnet, engages with the drive pulley and the compressor rotor begins to rotate.
1. If, when the air conditioner is turned off, the clutch emits during rotation extraneous sounds, heats up or a burning smell appears, then its bearing has probably begun to collapse. In this case:
If the clutch drive is made by a separate belt, remove it. After that, you can go to the service to replace the bearing. In some advanced cases, it may be necessary to replace the compressor clutch or its constituent parts;
If the clutch drive is made from common belt drive auxiliary units, then, perhaps, another belt wiring scheme is provided (bypassing the compressor clutch). In the case of a successful bypass maneuver, you can go to replace the bearing. If it is not possible to bypass the compressor clutch, then somehow (perhaps in tow or on a tow truck) you need to get to service center and change the bearing.
2. If you don’t hear a click after turning on the air conditioner, then the following problems are possible:
There is a refrigerant leak and circuit diagram control blocking the compressor;
The pressure sensor in the system is out of order;
The control circuit is broken;
Coil burnt out electromagnetic clutch;
The engine control unit for some reason blocked the compressor from turning on.
3. If the clutch rotates easily and freely, but when the air conditioner is turned on, obvious extraneous noise or even the engine stalls, then, most likely, the compressor is stuck. The internal pump part of the compressor cannot be repaired. In this case, the compressor will have to be replaced.
4. And the last, most unpleasant option. A click is heard, the clutch easily rotates the compressor shaft. There is no air cooling in the cabin. The compressor may be running idle. In this case, only an experienced specialist in the presence of control and diagnostic equipment can determine the malfunction.
Reducing valve. It is built into the compressor and performs a protective function, triggering when the pressure at the compressor outlet rises more than allowable value. Cause of operation pressure reducing valve there may be a failure of the high pressure switch, electric fan, etc.
A condenser (air conditioner radiator) located in front of the radiator of the engine cooling system and having a coil with developed fins for rapid condensation of the vapors of the refrigerant compressed by the compressor and removal of the heat released during this.
The fan is located in front of the condenser (air conditioner radiator). When the air conditioner is turned on, the engine control unit turns on the fan power circuit, which improves heat transfer in the condenser and reduces pressure in the air conditioner system.
At least once a year, preferably before the start of summer operation, wash the fins of the condenser cells from adhering dirt, dust and anti-icing agents. This will improve heat transfer, reduce the pressure in the system and increase the service life of the system elements.
Do not use high pressure water jets to clean the condenser. This can damage the thin-walled fins.
Even with regular washing, the need to replace the condenser occurs much more often than we would like. The fact is that he is the first to take on the flow of anti-icing reagents, dirt and pebbles from the road, and his tubes are very thin. In most cases, when operating a vehicle in big city the condenser is damaged by corrosion in the third or fourth year of operation.
If, as a result of corrosion, the condenser has lost its tightness, then it makes no sense to repair it. Even if the master of argon welding manages to weld the damage, a leak may soon appear in another place. By the way, the pressure in the system on hot days can reach up to 25-30 atm. In addition, it should be remembered that the condenser tube has a complex structure: along it is divided into channels by partitions. And it is highly likely that after welding, some of the channels will be blocked. Accordingly, the dissipated power will drop and the operation of the air conditioner will deteriorate, especially when standing in traffic jams and in hot weather.
Among other things, after each experiment with condenser welding, you will need to pay for welding, installation and dismantling of the condenser and charging the system with refrigerant. So it is better to install a new one right away, however, instead of an expensive original one, it is quite possible to buy a cheaper condenser from authorized spare parts manufacturers.
An orifice pipe with a strainer is installed in the pipeline supplying liquid refrigerant to the evaporator heat exchanger. The orifice in the nozzle limits the flow of liquid refrigerant and reduces the pressure in the evaporator. After the engine is stopped, the liquid refrigerant continues to flow through the throttle pipe from the zone for some time. high blood pressure into the low pressure zone.
The flow of fluid through the throttle hole is accompanied by a characteristic hissing sound, which is heard for 30-60 seconds after the engine is stopped and does not indicate a malfunction.
This is how the choke looks like: 1-filter grid; 2-tube with a calibrated hole; 3-sealing O-ring; 4-grid for spraying refrigerant.
Before installation, check the condition of the mesh filter,
O-ring and refrigerant splash screen. When installing the throttle in the pipe, pay attention to the direction of the arrow on the body, it should point towards the evaporator heat exchanger.
When installing a new choke, use the same color as the original choke. Chokes of other colors have different tube hole diameters, so their use may affect the efficiency of the air conditioner.
The photo for comparison shows a throttle (black) that needs to be replaced. it should also be noted that such a condition of the filter mesh is the first sign of the destruction of compressor parts.
WarningThe air conditioning system is under high pressure. Until the complete removal of the refrigerant, it is forbidden to disconnect any hoses and remove the units of the air conditioning system. The removal of the refrigerant must be carried out exclusively by a dealer's workshop or a specialist workshop. Even after removing the refrigerant from the air conditioning line, it is only possible to disconnect the hoses after putting on goggles.
The device of the air conditioning system
The following is a list of procedures for maintaining the air conditioning system, ensuring that it maintains its normal operation for a long time.
| PROCEDURE | ||||
|
It is recommended to turn on the air conditioner for at least ten minutes at least once a month. This should be done especially in winter, when, due to long periods of inactivity, seals and seals harden and are subsequently destroyed.
Leaks in an air conditioning system show up best when the pressure and temperature rise to operating levels. To detect leaks in the system, run the engine for five minutes with the air conditioner on. Stop the engine and inspect the A/C hoses and joints. Oily smudges indicate a refrigerant leak.
Due to the complexity of the air conditioning system, and the fact that system diagnostics require the use of special equipment, any maintenance and inspection work must be carried out by specially trained personnel.
If the air conditioner does not work at all, then check the fuse panel (see. subsection 12.1) and the air conditioner relay, which are located in mounting block inside the engine compartment.
The most common cause of unsatisfactory air conditioner performance is insufficient refrigerant charge. If there is a noticeable increase in air temperature from the air conditioner, then check the completeness of the refrigerant charge as described below.
Checking the refrigerant charge
| PROCEDURE | ||||||||||||||||
|
||||||||||||||||
heater
If there is no air heating in the heater, then the reasons may be the following: either the thermostat does not close, as a result of which the liquid warms up insufficiently and heats up the heater radiator poorly (in this case, replace the thermostat (see paragraph 1). subsection 4.3)), or the heater hose is clogged, which prevents the flow of fluid through the radiator. In this case, flush the hose:
If the fan speed does not match the switch position, check the fuses, wiring, switch, resistor pack, or motor (see subsection 3.3.14).
If no air comes out of the air duct outlets, proceed as follows:
If the mat is damp or coolant vapor is leaking through the vents, there is a leak in the heater core. Replace radiator (see subsection 4.5), since the heater radiator is usually not accepted for repair.
Check that the heater/air conditioner drain hose located on the right side on the bulkhead of the engine compartment.
Show phone
Diagnostics for free! Work on the unit 500r. Removal / installation of units, departure of the master.
Thanks to our extensive experience in this area and the availability of all spare parts, we carry out repairs of units within an hour.
All work guaranteed for 6 months.
You can also buy a new and remanufactured starter and alternator, stove motor, air conditioning compressor or steering rack for exchange and with a guarantee of 1 year.
Our services:
- Repair of starters
Starter repair is done within an hour. The cost of repairing the starter is 500 rubles.
Bendix replacement from 700r.
Replacing the retractor relay from 1300r.
Replacement of the brush assembly from 800 rub.
Replacement bushings from 300r.
Replacing the gearbox from 700r.
- Repair of generators
Replacement brushes from 500r.
Replacing the regulator relay from 800 rubles.
Replacement diode bridge from 1200 rub.
Replacement or repair of the rotor from 800 rubles.
Replacing the rotor rings (collector) from 600 rubles.
Replacing the winding (stator) from 1800 rubles.
Replacing bearings from 1000r.
- Repair of stove motors
Repair of the stove fan during the day.
- Repair of steering racks.
Repair of the steering rack is carried out within 2-3 hours. Removal and installation of the steering rack is carried out in our service or you can bring it in for repair removed rail from the car.
- Repair of power steering pumps
Repair of the power steering pump is carried out on average in the region of an hour. The cost of repairing the power steering pump is 1000 rubles. plus the cost of parts. Removal/installation
- Repair of ball joints and suspension arms
Removal, installation of levers and their repair in our service takes an average of 2 hours.
- Repair of shock absorber struts
Repair of gas oil shock absorbers for all cars. The cost of repairs is only 1000 rubles.
- Repair of air conditioner compressors
The cost of repairing the air conditioning compressor 1000r. plus the cost of parts. Removing installation of the compressor, refueling the air conditioner.
We service all car brands: Audi Q3, Q5, Q7 (Audi Q3, Q5, Q7), BMW X1, X3, X5, X6, e39, e46, e60, e65, f10, f01, Chevrolet Captiva, Cruz, Lacetti, Niva, Blazer, Spark, Tahoe, Aveo, Lanos, Chrysler, Citroen Jumper, C2, C3, C4, C5, Berlingo ( Citroen Jumper, C2, C3, C4), Daewoo Matiz (Daewoo Matiz), Nexia, Espero, Dodge (Dodge), Fiat Ducato ( Fiat Ducato) Doblo, Ford Transit, Focus 2, 3 ( Ford Transit, Focus 2, 3) Mondeo, Peugeot Partner, Boxer, 206, 307,308,407,605. Honda Accord, Civic, ( Honda Accord, Civic, Cr-v), Hyundai Solaris, Sonata, Santafe, Porter ( Hyundai Porter), Jeep (Jeep), Land Rover (Land Rover), Range Rover, Mercedes 221, 220, 140, 124, 216, 215 (Mercedes), Mitsubishi Lancer, Carisma, Galant, Pajero (Mitsubishi), Mazda 3, 6 ( Mazda 3, 6), Nissan Almera, Qashqai, Pathfinder (Nissan), Patrol, Opel Astra, Corsa, Zafira, Vectra (Opel), Renault Megan, Logan, Koleos (Renault), Rover (Rover), Saab (Saab), Skoda Rapid, Octavia ( Skoda Octavia), Suzuki CX4, Swift, Vitara (Suzuki Svift), Lexus, Toyota Camry, Corolla, Avensis, Rav 4, Prado Volkswagen Passat, Tuareg, Transporter, Polo, Jet (Volkswagen), Volvo xc 60, xc 70, xc 90, s60, s 80 (Volvo), GAZ, KAMAZ, Iveco, Tatra, Neoplan, Scania, Freightliner, MAN, Volvo, GMC .
I read in the magazine Behind the wheel that if the car is sitting on the sludge (cold), like mine, then once a month it is necessary to start it in a warm box and turn on the air conditioner? Does it make sense to turn on the air conditioner in a cold room, and if I don’t turn it on, will it bend?
Opinion (Vladimir)
I turned it on two or three times during the winter for about three minutes. Didn't notice much change in my work over the summer.
And theoretically, of course, you need, as written below
Opinion (FOX(Nexia))
From my experience, the air conditioner just won't turn on until engine compartment will not warm up to a certain temperature .... That is. as soon as it came up and started up, it doesn’t turn on for me, and when it warms up, it turns on at -20 ... Personally, I try at least once a week for 10-15 minutes. turn on this unit, because together with freon oil walks through the system, and all seals in the air conditioning system are lubricated ...
Opinion
After reading the "Operating Instructions for Nexia, as well as having studied the available primers, I came to the conclusion:
1. You can use the air conditioner in winter, BUT:
1.1. Only after the engine is fully warmed up under the hood.
1.2. When the ambient temperature is ABOVE -5 degrees, you can use the air conditioner for a long time to dry the air in the cabin in order to reduce the fogging of the windows. With such outdoor temperature there is still hope that the condensate that has settled on the evaporator will have time to melt and drain out without freezing while the engine cools down.
1.3. When the ambient temperature is BELOW -5 degrees, the air conditioner can be turned on prophylactically, for a SHORT TIME (2 - 3 minutes), so that its insides are lubricated. It is undesirable to use the air conditioner for a long time, because. the condensate that has settled on the evaporator may not have time to melt, and it is also possible that the flowing condensate may freeze in the drain pan and outlet hose. By analogy, a household freezer in an apartment will thaw only at positive temperatures, and the lower the ambient temperature, the longer the freezer thaws. If the car is stored in a heated garage, then the air conditioner can be used for a long time and for more very coldy. It is undesirable to use the air conditioner for a long time when it is not stored in a garage.
1.4. The mechanics of the location of the temperature regulator damper completely ALLOWS the inclusion of MAX heating (the regulator in the red zone) and the simultaneous activation of the air conditioner. With this combination, the air will first be cooled by the evaporator of the air conditioner, and at the same time it will be dried, because. moisture will settle on the evaporator, like snow in the freezer of a household refrigerator, and then be heated by the stove radiator, subject to the conditions of paragraph 1.2.
1.5. If, nevertheless, the air conditioner worked continuously in winter for quite a long time, then it is very useful before turning off the engine first:
- turn off the air conditioner,
- then turn on the MAX heating mode (the regulator to the end in the red zone)
- enable recirculation mode
- turn on the fan at medium speed (2 or 3)
- let the engine run for 3 - 5 minutes at XX. During this time, the condensate on the evaporator will melt, drain into the pan and flow out through the outlet hose.
- then turn off the recirculation mode
- with the windows closed, turn on the fan at MAX speed - which will allow overpressure in the cabin, blow the condensate drain hose warm air out of the cabin before it freezes.
2. Winter air recirculation mode is ONLY useful for more quick warm-up cabin and BEFORE getting into the car yourself and passengers. When traveling with passengers in winter, the recirculation mode will create a strong greenhouse effect, which even the air conditioner will probably not be able to cope with and the windows will fog up a lot.
3. Now it becomes clear why the "Operating Instructions for Nexia" says about a possible joint work stoves and air conditioners only in the off-season, when there are still no negative temperatures and there is no clear guide on how to use the air conditioner in cold weather. The designers are afraid that the condensate may freeze in the drain pan or in the drain hose, and then it is quite possible to overflow the clogged pan and pour the condensate into the interior of the car. Item fulfillment
1.5. will help to avoid this. I foresee various objections that many people use air conditioning in winter and everything is in order so far.
There are a number of factors that may well affect the achievement positive effect.
- If the air conditioner is running for a short time, then during a short trip there may be little condensate on the evaporator and it will not overflow the pan.
- Frequent thaws in Moscow also contribute to thawing condensate in the sump and drain hose.
- The presence of crankcase protection creates more closed space under the hood, which increases the temperature under the hood and also prevents freezing of condensate at the outlet of the drain hose.
- Even an unheated garage will keep the engine warm longer under the hood after it stops, which is also useful.
4. Now about the benefits of ajar windows in Nexia. The air outlet / exhaust system from the Nexia's cabin with the windows closed / raised is rather inefficient and tricky. This can be found here by reading the text. That is why Nexia is so prone to strong internal fogging of glasses in the cold season. Of course, you can turn on the fan at MAX speed, but it hurts too much, so optimal speed fan on the number 1, or 2.
In any case, in winter it is recommended to lower the glass of at least one window a little (by 1 - 2 cm), and preferably both rear doors. It is very easy for owners of electric glass lifts to do this. The main thing is not to forget before long-term parking close them. In winter, there is practically no dust, and slightly lowered windows greatly improve the ventilation of the cabin and reduce humidity.
