The design of the Daewoo Nexia stove must be considered in the overall climate system of the vehicle, which also includes air conditioning and ventilation. The heater is used to create a comfortable temperature in the vehicle interior, regardless of weather conditions. Moreover, the temperature inside the car directly depends on how warm the engine is. Further details about the principles and features of the system under consideration.
Operating principle of the heating system
The interior is ventilated through an air intake located inside a protective box located in the windshield area. In addition, forced ventilation is also provided, which is provided by a working stove blower. The direction of air flow is regulated by the rotation of the heater deflectors and the special flaps included in their design, which change their position relative to the axis. The body is ventilated through exhaust openings located in the rear doors.
The stove does not work, 4 and other speeds do not turn on
In this case, the symptoms of a non-functioning stove are as follows:
- It's cold - we wrote about this above.
- The fan, or rather the electric motor, does not work.
- The fan turns on and off, the entire ventilation unit does not work.
- Problems in the control panel.
If there is a problem with the electric motor, the following may be possible:
- The fuse (F12 in the diagram) or the heater fan relay (K24 in the diagram below) has blown - replace the fuse and relay.
- Electricity does not reach the stove. There may be problems in the circuit before or in the unit itself, the fuse has blown, it may need to be removed.
- The electric motor is burnt out and the fan does not work at all 4 speeds. In this case, the air conditioner and circulation may not work.
Connection diagram.
Search for the problem:
- If the drive is very cold, you can temporarily run a separate wire directly from the ignition switch contact group through the fuse to the fan. In winter you will definitely drive a warm car, and in the spring you will understand everything.
- If only the 4th speed fan does not work, check the serviceability of the relay (the contacts may burn out) and replace it if necessary.
- If the first three speeds do not work, they are turned on through the resistor block R10 of the heater fan (diagram above), which is located in the air intake housing.
- If the fan periodically turns off and on, and this also happens to the entire ventilation system, pay attention to the ignition switch contact group (KG). Pin 15A powers the air conditioner and fan motor. Check the contacts in the ignition switch KG, replace if necessary. This solves the problem.
Heating control features
It is worth noting that the Daewoo Nexia stove operates independently of air conditioning, fully heating the car interior, as well as ventilating it if necessary, preventing freezing of the windshield and side windows due to their constant blowing of air heated by the heater radiator. In addition, the stove can also function when the air conditioner is on. For example, it is turned on to slightly reduce the temperature inside without turning off the heater. A design feature of the Nexia climate system is that the elements of the heater and air cooler form a single module, which is controlled using the heater controls located on the central panel.
How to determine the cause of the malfunction
Fuse location diagram
Without experience in servicing a technical device, it is extremely difficult to diagnose the source of the breakdown. For objective results, contact a workshop.
During an independent inspection, we recommend narrowing the search by grouping the breakdown “by characteristics.”
- Check the mechanisms for electrical components: the fan does not move when the switch is activated, the fan operates unstable, jerkily;
- Mechanical reason: the Daewoo Nexia stove blows cold air, insufficient airflow, weak air flow.
For repairs, we place the machine on a flat platform, or perhaps on an inspection hole for ease of diagnosis. We fix the rear row of wheels with wheel chocks, squeeze the parking brake, and move the rocker to the first gear position.
We start the engine, turn on the levers of the stove heating unit one by one. By this action we exclude (confirm) a breakdown in the electrical circuit. Let's assume it's a faulty fuse.
We recommend: How to set the ignition using a strobe?
We carry out the replacement ourselves, without going to a workshop. In accordance with the instruction manual, the fuse responsible for heating is located under the index “F12”. We remove it, insert a new one, the work is completed.
The fuse module is located behind the instrument panel, on the left side. Access from the driver's side.
Daewoo Nexia heater diagram. Purpose of the main components of the stove
The design for heating the Daewoo Nexia interior is represented by the following elements.
Interior heating Nexia has a common control panel with air conditioning, which is located on the dashboard and contains the following controls and switches:
The operation of the switch that controls the blower modes is not affected by the position of the thermostat knobs, as well as the heater damper. The fan rotation speed is regulated by changing the voltage supplied to the terminals of its electric drive. The position of the heater dampers is changed using a pneumatic drive, and the thermostat is connected to its actuator through a traction connection (cable).
Some features of the functioning of heating and recirculation systems Daewoo Nexia
Note that when the recirculation mode is turned on for a long period of time, the condition of the driver and passengers may worsen due to the accumulation of carbon dioxide compounds in the cabin. Therefore, it is recommended to use this mode only as a last resort (moving through areas with heavy smoke). Therefore, when the need to use autonomous ventilation passes, the recirculation mode should be turned off. It is also not recommended to use it at low ambient temperatures, since condensation will accumulate on the glass in the cabin, which will immediately turn into ice. One of the peculiarities of the air conditioner is that it will not turn on if the heater fan position switch is set to mode “0”, that is, off. This is not considered a problem.
Source
Recycling
The heating system of Daewoo Nexia implies the presence of an air recirculation function. This is a mode that involves using air from the cabin rather than from the street. This is relevant in cases where the car is passing through an area of heavy smoke or gas pollution. It is important to close all windows, otherwise there will be no point in switching.
However, the driver and passengers may feel a headache if this mode is turned on for more than 15 minutes. This is due to the fact that oxygen does not enter the car, and the concentration of carbon dioxide exceeds the norm. Therefore, recirculation is used only in extreme cases, when there is, for example, heavy smoke outside and action has to be taken to prevent harmful chemical compounds from getting into the car. As soon as the car has passed the danger zone, the mode is turned off.
Experienced drivers are aware of the fact that at low temperatures outside, using recirculation will lead to rapid fogging and subsequent freezing of the windows. This process can lead to an emergency on the road, especially if the car is moving quickly. Therefore, in severe frosts, it is better to refuse to use the mode, even if it is necessary due to smoke.
Video: Daewoo Nexia climate control unit - what breaks there!
It is also worth noting that on cars higher in class than the Daewoo Nexia, recirculation is used automatically when washing the windshield. The washer fluid does not always have a pleasant smell, and its evaporation occurs in the immediate vicinity of the air intake. Therefore, a system has been implemented that includes air intake from the passenger compartment.
The device of the stove of the Daewoo Nexia car
The stove allows you to create a comfortable microclimate for the driver in the interior of any car. In addition, it heats the glass, freeing them from ice or frost. All this is especially true in the cold season.
An important condition for the operation of the stove on the Daewoo Nexia is the power unit warmed up to the standard temperature. The stove starts heating well only after the engine has warmed up.
The interior heating system consists of the following parts:
The electric motor of the Daewoo Nexia car heater has a cylindrical shape and a plastic-metal body. Its technical characteristics are as follows:
The stove vacuum switch is a damper control device. The driver from the cabin can set a comfortable operating mode for the stove by moving the levers on the control unit. If it is not possible to direct the air flow to the desired area of the cabin, minor repairs will be required.
Warm-cold switch or blower direction switch? If the first - look at the “beard” under the tidy on the right (where the passenger’s knees are) - there is a cable that moves the damper lever. Perhaps he jumped off or something else happened to him, move the handle and see if it works. And if there is blowing, then, most likely, the hose (thin, almost like the rod from a handle) coming from the intake manifold into the cabin (under the tidy) has come off - the damper drive is vacuum, and the vacuum is taken from the intake through the hose.
Old timer
https://www.nexia-club.ru/f/hodovaya/4737-ne-rabotaet-pereklyuchatel-pechki/
General ventilation of the interior is carried out through the air intake, which is located in the area of the Daewoo Nexia windshield. The air intake takes in the required amount of air, supplies it to the stove components - there it warms up and enters the cabin.
Features of the operation of the Daewoo Nexia car heater in recirculation mode
Car owners know that it is impossible to operate a Daewoo Nexia car for a long time with a stove operating in recirculation mode - the concentration of carbon dioxide in the cabin can greatly increase. Therefore, it is recommended to use this mode only when crossing areas with strong odors (landfills, fires, etc.).
It is also not recommended to turn on recirculation in winter, as condensation will quickly begin to accumulate and freeze on the glass. This will make it very difficult for the driver to see.
Main stove malfunctions
Failure of the stove can lead to unpleasant consequences for the driver. This is felt most strongly in the cold season. When such a situation occurs, it is first necessary to accurately diagnose the cause of the malfunction.
The stove heats the air poorly
Play may appear on the damper drive. In this case, the stove will operate normally, but due to the play, the damper will begin to bend under its own weight, forming a gap. Through this gap, cold air will begin to flow into the cabin, reducing the temperature in the cabin.
Heater fuse location
Sometimes the heater fuse may blow. Unlike most cars, the fuse box on the Daewoo Nexia is located not in the engine compartment, but in the passenger compartment. The heater fuse is red and is located in the mounting block in the instrument panel. To replace it you will need:
Table: assignment of fuses for the Daewoo Nexia
| Fuse designation | Rated current, A | Purpose of fuses |
| F1 | 10 | ECU (battery circuit) |
| F2 | 10 | Side lights, license plate lights |
| F3 | 10 | FlaflyBHafl airbag |
| F4 | 20 | High beam headlights |
| F5 | 10 | Left headlight (low beam) Electric drive for adjusting the direction of the light beam of the left headlight |
| F6 | 10 | Right headlight (low beam) Electric drive for adjusting the direction of the light beam of the right headlight |
| F7 | 30 | Electric fuel pump fuel injectors |
| F8 | 20 | Turn signals, hazard warning lights, brake lights |
| F9 | 30 | Windshield wiper |
| F10 | 10 | Fuel filler flap drive, ABS, immobilizer |
| F11 | 10 | Air conditioning compressor electromagnetic clutch activation relay |
| F12 | 30 | Cooling Fan Motor (Low Speed) |
| F13 | 20 | Reversing lamps, alternator circuit, instrument cluster, cigarette lighter fuse, melodic horn |
| Fi4 | 30 | Horn, Cooling Fan Motor Relay (High Speed) |
| F15 | 20 | Clock with display, interior light, trunk light, antenna drive motor |
| F16 | 30 | Window lift motors |
| F17 | 10 | Car radio (circuit from ignition switch) |
| F18 | 30 | Trunk lid lock control, rear window heated timer, central door locking system, car radio (battery circuit) |
| F19 | 30 | Heater fan relay |
The diagram clearly demonstrates the location of car fuses
Nexia stove repair: what you need to know
As practice shows, on Daewoo Nexia the heater radiator fails quite often. The main one on the list of signs of malfunction is the occurrence of a radiator leak. To solve this problem, the device is dismantled, after which the radiator of the Nexia stove is replaced.
According to factory technology, the radiator is replaced only after removing the dashboard, but there is another way. Sequencing:
- it is necessary to drain the coolant from the system to prevent antifreeze from entering the vehicle interior;
- disconnect the inlet and outlet pipes from the engine compartment;
- remove the glove compartment and remove the stove radiator from its seat;
- We select the required radiator, referring to the original catalog number of the radiator of the Daewoo Nexia stove (03059812) and taking into account its dimensions.
If the radiator or pipes are clogged, you should try to clean them using cooling system flushing agents.
Also, repairing the Daewoo Nexia stove may require replacing fuses or dismantling the control unit. The fact is that malfunctions in the operation of the stove on the Nexia may be associated with blown fuses.
The fuses on the Daewoo Nexia are located in the vehicle interior (in the mounting block under the instrument panel). Sequence for replacing fuses:
- we find the fuse box to the left of the steering wheel and remove its cover;
- based on the information indicated on the inside of the cover (the purpose of each element), you will need to locate a red fuse with a rating of 10A;
- We pull out this element with pliers for inspection, and if necessary, replace the burnt fuse with a new one.
Another reason why the stove does not heat up may be a malfunction of the control unit itself. In fact, it is a panel with levers and switches located on the center console.
We also recommend reading the article about how to repair the VAZ 2107 stove. From this article you will learn how the VAZ 2107 stove is designed and works, as well as what heater malfunctions occur most often and how to repair the 2107 stove.
The dismantling of the control unit is carried out as follows:
- bend the fasteners for fastening the trim on the center console and remove it;
- Having disconnected the drive cable under the dashboard from the passenger seat, use a Phillips screwdriver to unscrew the fastening screw;
- Having removed the locking ring, remove the damper drive cable;
- using a screwdriver to pry the control unit on each side, carefully pull it towards you to unclip the latches;
- Having removed the vacuum lines from the used stove, pull out and disconnect the stove tap cable;
- Having disconnected the power terminal, pull the control unit towards you;
- remove the control unit for the stove, first making sure that all other connections and connectors are disconnected;
- The installation process is carried out in reverse order.
By the way, if the damper cannot completely shut off the supply of cold air (the temperature in the cabin decreases), the damper needs to be adjusted.
Modification of the stove of the Daewoo Nexia car
Craftsmen have come up with a scheme that makes the stove more efficient. It involves returning antifreeze from the radiator not to the expansion tank, but to its pipe. This, in turn, allows the heat of antifreeze to be used more efficiently to heat the interior.
To implement this scheme, you will need a tee for distributing antifreeze. You can pick it up at a car dealership or assemble it yourself from plumbing elements. The tee installation algorithm is as follows:
Video: increasing the efficiency of interior heating
To simplify the task, you can replace the tee with ordinary car hoses connected to each other.
Adjusting the heater dampers
To adjust the stove fins:
- Remove the control unit completely.
- Go to the radiator.
- Without touching the wiring, unscrew the three radiator mounting bolts using ratchet 7 and slide it down.
- When you reach the flapper, rotate it all the way to different positions and check the clearances. If there are any, use a caulk or other method to get rid of them.
- Adjust the air cable by tightening or loosening it.
Installing an additional pump on the stove
Another way to modify the stove would be to install an additional pump. The water pump ensures forced circulation of the coolant. The second pump will allow the antifreeze to circulate faster and heat the interior more intensely.
Installing an additional pump on the stove can take no more than half an hour, so it is quite possible to do this work yourself.
To install an additional pump you will need:
The work is performed in the following order:
If the small fluid circulation circle operates without leaks, then the efficiency of the stove will increase significantly. It is recommended to install a second pump on used Daewoo Nexia cars, since due to partial wear of the mechanisms, the stove may no longer cope with its job.
Thus, it is quite simple to independently diagnose and repair the malfunction of the Daewoo Nexia car’s stove. Moreover, without resorting to the services of a car service, you can modify the heating system. In this case, the efficiency of heating the interior will increase noticeably.
Source
How to increase air flow in the stove
Sometimes car owners are faced with the fact that the heater in the Daewoo Nexia car does not blow into their feet. In this case, experienced car enthusiasts are advised to disassemble the control unit and find the rubber membrane. There will be damage on it, most likely a small hole. The result is that air is sucked in and cannot move the dampers. The hole needs to be sealed with any good rubber glue, let it dry, then assemble the block.
We recommend: How to replace the cabin filter of a UAZ Patriot with your own hands?
Important! To ensure simultaneous blowing of the feet and windows, it is necessary to block the damper or its drives in an intermediate position. In the second case, the movement of the drive is limited to two positions: suction or extrusion. The first provides air flow to the legs, the second - to the glass.
In a Nexia car, the stove blows weakly and when its channels are clogged or air bubbles begin to form in the heating system. The easiest way to get rid of them is to turn off the engine, open the expansion tank cap, then manually pour in antifreeze. Clogged channels are cleaned with cleaners for the cooling system and washed for seven to eight minutes.
Additional pump
If at first glance everything works properly, but in a Daewoo Nexia car the heater blows cold air, this means there is a manufacturing defect. There is no need to be upset; everything can be fixed by upgrading the stove.
Some motorists install an additional electric pump from a GAZelle on their car; Bosch pumps are also suitable. The pump is installed so that the antifreeze returns from the stove to the engine, then the flow of heating air into the cabin increases.
The operating principle of the Daewoo Nexia heating system
The heating system in a car is designed as follows. The engine of the machine becomes hot during operation. To cool it, antifreeze is used, poured into the engine cooling jacket. This liquid heats up along with the engine, and when heated, it goes into the main radiator of the car. From there, through a system of pipes, hot antifreeze enters a small radiator of the stove, blown by a small fan. Heat from there enters the cabin through special air ducts and heats it. In the rear doors of the car there are exhaust openings necessary for ventilation of the interior. Excess heat escapes through them.
Diagram of the main elements of the heating system on the Daewoo Nexia
Here it should be noted one feature of the Daewoo Nexia heating system: it can operate independently of the air conditioner. Such design solutions on passenger cars are quite rare. The heater of the Daewoo Nexia not only heats the interior, but also prevents the glass from freezing, and it can work together with the air conditioner. This feature is useful if the driver wants to reduce the air temperature in the cabin by several degrees without turning off the heater.
Blowing cold
If the stove does not work, that is, there is only cold air, then the reasons may be the following:
The damper lever (“Cold”, “Heat”) is in the wrong position
Check if you forgot to put it in the “Cold” position. If the damper is closed, the interior will be cold even with the fan on.
Heater core clogged
Rinse inside and outside (if necessary). To do this: drain 3 liters of coolant from the engine radiator (do not forget to tighten the cap on the expansion tank). Remove the hoses from the heater radiator and blow out the heater on both sides with air under a pressure of at least 3 atmospheres or rinse with clean water (first cold, then hot).
Also use a special auto chemist to flush the system or replace the entire assembly. Read here - how to flush the engine cooling system.
If the need arises to replace the lamps, here are their part numbers:
- Return line - position 96179610.
- Feed - article number 96148970.
The thermostat has failed
The heating system is designed to start working immediately after starting the engine (with the heater on). We started the car, turned on the heater, and as the engine warms up, heat will flow into the cabin.
Due to the fact that the thermostat valve is in a certain position, the antifreeze can constantly move in a large circle. The engine warm-up time increases, and the heater also turns on with a delay.
The solution is to replace the thermostat. The standard thermostat for Daewoo Nexia is 870C. Some are betting on 920C. This increases the time the coolant moves in a small circle, due to which the heater radiator will warm up better.
It’s better not to set the thermostat to 970C; the ECU will have to be reflashed.
The damper is stuck in the “Warm” position
In this case, the cable itself can pass without jamming. Remove the crankcase, which is located next to the engine (behind the radiator), and not to the side of the passenger compartment, and check how the shock absorber reacts when you try to move it using the lever.
If it is stuck and there is no time or opportunity to fix the problem, manually turn the shock absorber to the “Cool” position and secure it with a self-tapping screw. In the future, you will most likely have to change the extended cable.
Cabin filter clogged
Daewoo Nexia has a carbon cabin filter, which is highly hygroscopic.
When it is dirty, the moisture accumulated inside freezes at temperatures below zero, and the filter does not allow air to pass through. Replacing the item should help.
Checking the damper for hot and cold air
Warm up the engine and turn it off. We put the thermostat in the extreme left position (blue stripe), and then sharply move it to the extreme right position (short red stripe).
If the heater damper operates, you will hear a characteristic click (the damper is closed). If there is no cotton, check the “Cold”, “Hot” toggle switch. He must go to the end.
Otherwise, shorten the cable.
Main malfunctions of the Daewoo Nexia heating system
There are many reasons why the stove may stop heating the interior of the car. Let's list the most common ones.
Oven radiator clogged
The heater radiator, like any other part, becomes unusable over time. This usually happens due to the use of low-quality antifreeze with an abundance of impurities. They form a layer of scale on the radiator tubes and its throughput begins to decrease. Eventually, fluid stops flowing into the radiator and the cabin becomes cold, despite the fact that the heater fan is operating normally. The problem is resolved by replacing the radiator.
A thick layer of scale and dirt is clearly visible in the Nexia’s radiator grille
Air lock in the heating system
Typically, a breakdown occurs when the tightness of a pipe in the heating system is lost. When air gets there, the circulation of antifreeze is disrupted, and it simply does not reach the stove radiator. The solution is to completely drain the antifreeze and then blow out the heating system with compressed air.
Due to ruptures in the air duct pipes in the Nexia heating radiator, air jams may occur
Vacuum switch failure
The vacuum switch on the Nexia is a reliable device, but the mounting strips on which it is held are quite thin and often break. This can lead to the fact that the air intake damper simply stops opening and the normal circulation of warm air in the cabin is disrupted. To fix the problem, the driver will have to purchase a new vacuum switch, since mounting strips for it are not sold separately.
Destruction of electric motor bearings
As mentioned above, the central shaft of the heating electric motor with the impeller is suspended on two ball bearings, which can collapse over time. If this happens, then after turning on the stove the driver will hear a characteristic creak, gradually turning into a loud grinding sound. The problem can only be solved by replacing the furnace electric motor, since the bearings for it are not sold separately.
Bearings on Nexia electric furnace motors often fail
The stove does not blow on your feet
This type of failure occurs when the vacuum switch that controls the dampers fails. After this, the dampers are lowered to their lowest position. As a result, the access of hot air to the legs of the passenger and driver is almost completely blocked. The problem is solved by removing the glove compartment and replacing the vacuum switch.
Removing the heater control unit on the Daewoo Nexia
The control of the heater and air conditioner on the car is arranged in one control module located on the dashboard, to the right of the driver. The buttons on this module fail quite rarely. However, the need to remove the control unit may arise if the vacuum switch, which was mentioned above, breaks down. There is nothing difficult in dismantling the block, and you only need a flat-head screwdriver to do the job.
Sequence of dismantling the control unit
To remove a broken device, it is wise to follow the recommendations of experienced repairmen:
Video: removing the climate control unit from the Nexia
Replacing the heater radiator on a Daewoo Nexia car
As mentioned above, the stove radiator on the Nexia may become clogged. In addition, it sometimes begins to leak. This happens when its central tubes are completely destroyed by corrosion caused by the use of poor antifreeze. Since the standard stove radiator on the Daewoo Nexia is made of aluminum, it is not possible to solder it without special equipment. So the car owner has only one choice: replacing the unit.
Heating radiator replacement sequence
To complete the work efficiently, follow the proven algorithm:
Installation of an additional furnace pump on the Daewoo Nexia
Since the heating system on cars of the brand in question has never been very powerful, many owners make additional efforts to insulate their car. One way to increase the heater power is to install an additional pump. As a rule, they install a pump from a GAZelle.
As an additional pump, a GAZelle pump is installed on the Nexia
Sequence of installation of an additional pump
Device installation procedure:
Video: installing an additional pump on the Nexia
The heater on the Daewoo Nexia car can hardly be called a perfect device. The stove can cause the driver a lot of problems, especially if it has been in use for a long time. Fortunately, most of them can be solved independently, without resorting to the expensive services of service center specialists.
Source
