Why does a resistor fail?
The cause of resistor failure is burnout.
The fact is that it is constantly energized and transmits current. Experienced craftsmen, however, claim that the failure of the resistor may be associated with malfunctions or contamination of the fan as a whole. When the resistor fails, all the electric current goes directly to the fan, and it only operates at the fourth, maximum speed. Therefore, diagnosing this breakdown will not be difficult for a car enthusiast.
Possible causes of Renault Logan heater failure
Owners of Renault Logan cars often encounter the following problems: the heater does not heat up or cold air comes out of the deflators, although the pipes (the same ones through which the coolant, heated by the engine, goes to the heater radiator) are hot. There may be several explanations for this phenomenon:
- an air plug has accumulated in the pipe;
- Cabin filters or radiator cap are clogged;
- fuses have become unusable;
- low-quality/used antifreeze or insufficient coolant level;
- the antifreeze expansion tank has become unusable (usually after 100 thousand km), or its cap is loosely secured.
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Step-by-step instruction
1. Pull the lower casing off the latches and remove it. We take it as shown below and pull it to the sides (towards the doors).
2. Remove the clip to move the carpet aside. The clip can be pryed out with a flat screwdriver.
3. We gained access to the bolts for fastening the strip that supports the rack, and the torpedo is already attached to this rack. The bar must be removed to gain access to the radiator.
Unscrew the two bolts that are marked in the photo below.
4. Squeeze on the sides and push the clip marked below inside. The wiring harness is secured to this clip.
5. Remove the ignition switch connector from the strip. We press the latch and tighten it.
6. After removing the connector, we gain access to the nuts securing the bar. Unscrew the fastening nuts and remove the bar.
When you remove the bar, don’t rush, you still need to disconnect one wiring harness.
7. After removing the strip, we had access to the heater radiator.
8. Unscrew the three Torx T20 screws.
9. Place a rag under the pipes and take them out.
10. Bend the latches and remove the radiator.
The latches literally do not bend, you just need to press them and remove the radiator.
11. Before installing a new radiator, it is advisable to blow out the seat with compressed air or clean it manually.
12. Replace the O-rings on the pipes. After replacing the rings, lubricate them a little so that they fit into the radiator easily.
13. Install the radiator.
14. Fasten the radiator with two screws.
15. Insert the pipes into the radiator and secure the retaining bar with a screw.
16. Next, fill in the coolant, bleed the system, and remove air. We check for leaks in the pipes.
17. If there are no leaks, install a metal strip and the rest. I don't think this needs any details.
Replacing the heater light bulb
The main problem with a faulty light bulb is that it can signal that the stove is not working, although the heater will function normally.
To change a light bulb you need:
- Remove the radio cover and the buttons that control the operation of the stove.
- Unscrew the fasteners of the module and press in its lower part, and pull the upper part towards you.
- Find the latches on the sides and press them out.
- Unscrew the panel and look for the burnt out light bulb.
- Replace the light bulb and perform all manipulations in reverse order.
How does the Renault Logan heater work?
Air enters the car interior - both naturally and with the help of a fan. Air coming from outside can pass through the radiator, thereby heating up, or past it. This depends on the position of the damper, which is connected to the temperature controller.
The radiator heats the air entering the cabin. This occurs due to the circulation, oddly enough, of coolant. It removes heat from the running engine, heats up and, in a heated state, flows through special pipes to the radiator. The maximum heating temperature can be up to 100 degrees - the system is closed and under pressure, which allows it to withstand such loads.
Heated air enters the cabin through deflectors - special openings located in the center and sides of the instrument panel. The air supply intensity is regulated using the heater control unit.
How does the heating system work?
The principle by which the heating system for Renault Logan is designed has long been used by the automaker. The heater radiator is connected to the engine cooling system. Hot antifreeze circulates in it. The entry of heated air into the cabin through the air ducts is controlled by a damper controlled by a cable drive.
The fan can operate in four modes. Voltage is supplied to the fan contacts using a relay. The rotation speed is adjusted using a resistor, which is located in the device switching circuit. You can find this part behind the front panel trim, where the driver’s right foot is located. The resistor is white, and if you look under the panel you can easily find it.
To find the location of the relay, just open the hood of the Renault Logan. A mounting block is installed near the negative terminal of the battery. Here is the part you are looking for. To protect the electrical circuit for switching on the ventilation system, a 30 ampere fuse is installed. It is located in the mounting block, but located in the car interior.
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Let's sum up the results
Instead of fixing breakdowns, it is better to prevent them in advance. To do this, you need to regularly replace filters and choose high-quality coolants. These simple tips will help keep your Renault Logan stove in working order for a long time. It is very important to change the cabin filter on time, and in addition, monitor the condition of the cooling system, change antifreeze on time and use only high-quality coolants.
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Radiator fault
Another common reason why the stove does not heat properly lies in the radiator. This part of the heating system cannot be repaired due to its thin design. If any faults are detected, the radiator will require replacement. After purchasing a new part, you can begin to remove the old one.
The procedure is simple and consists of the following steps:
- First of all, you need to drain the coolant. Otherwise, it may stain the interior in the future.
- The next step is to disconnect the pipes in the engine compartment. The crimp clamps will have to be replaced.
- To be on the safe side, you should bleed the radiator to remove any remaining coolant.
- Remove the floor covering.
- Remove the radio or plug.
- Remove the center trim of the instrument panel.
- Remove the steering column cover.
- Remove the instrument cluster and its trim.
- Tighten the nuts of the panel reinforcement and remove it.
- Unscrew the screw securing the pipes.
- Unscrew the screws securing the heating radiator, release the latches of the heater housing and remove the device.
The old device can be consigned to the abyss of history. With the new one, do the same steps, but in reverse order. After a simple procedure, the stove heats up again.
Fan fault
In Renault Logan and structurally similar cars, repairing the heater fan must begin with checking the fuse. Before installing a new part, you must make sure that the fan speed switch is working correctly, otherwise you will need to replace it again. You can find the fuse in the interior mounting block. It is marked in green, and on the Renault electrical diagram it is designated as F36.
If the stove does not heat or does not work well, making a crunching or squeaking sound, then you will have to carry out repairs. In advanced cases, it may come down to a complete replacement of the node.
There is no need to remove the entire Renault Logan dashboard: just unscrew two bolts. The first is located under the facing panel of the right drain, the second is under the plug in the lower right part of the glove compartment. After unscrewing both screws, you need to remove the glove compartment from the guides by pulling it towards you. Be careful not to break anything.
A working fan needs to be cleaned, lubricated and returned to its place, repeating the sequence of actions in reverse order. If the part doesn't work, it will have to be replaced.
Selecting an electric heater motor
Most Logans are equipped with air conditioning, but there are also cars without this device. It is important to know that the heater motors for versions with and without air conditioning differ in shape and power connector.
For versions with air conditioning, a heater with a wide connector is used
On the model with air conditioning, the connector is narrow, and on the model without it, it is wide. There is practically no difference in the procedure for replacing a part, as well as in its location. The Renault Logan heater electric motor is located under the front panel in the area of the center console. It can be reached through the front passenger footwell. There are quite a few manufacturers of this unit, but structurally their products, as a rule, do not differ from the original.
On versions not equipped with air conditioning, heaters with a narrow connector are installed
Causes of stove malfunction
If it has been noticed that the efficiency of heating the interior of your Renault Logan has decreased, do not immediately panic. First you need to understand in detail what the problem is and find out the reasons. Depending on the nature of the malfunction, the interior heater may work poorly or not function at all. Let's look at the main reasons why the stove's performance is impaired:
- There is an air lock in the heating system.
- Thermostat failure.
- The pump is not working properly.
- The heater radiator is clogged.
- Problems with the heater motor.
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Despite the apparent simplicity of solving these problems, they are the ones that most often force car owners to carry out independent repairs or contact a service center.
Sequence of operations
The car cabin opens. The plastic clips that hold the flooring in place open up. The floor covering bends back. This allows access to the heater bracket with two bolts.
These bolts are unscrewed using a 14mm socket.
In the upper part of the heater bracket there is another pair of 14 bolts, they are also unscrewed with a socket wrench.
Behind the heater bracket is the wiring harness. It is held in place by plastic latches at the bottom. They are opened manually, after which the harness is carefully removed from behind the bracket.
After removing the wires, access to the radiator plate mount becomes available. It is tightly put on the radiator tubes and screwed to them. Using a 14mm socket, the central fastening bolt is unscrewed (here it is very important that the socket wrench be as long as possible, since with a short wrench you simply cannot reach the bolt).
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When the central mounting bolt is unscrewed, the plate is carefully removed from the radiator tubes
When removing this part, great care should be taken, since it is made of very fragile PCB.
After this, the rubber O-rings are removed from the radiator tubes.
Using a 13 mm socket wrench, unscrew the last two screws holding the radiator.
Next to these screws there are three plastic clips. They are bent manually.
The heater radiator is carefully removed.
A new radiator is installed in its place, after which the heating system is reassembled. After complete assembly, antifreeze is poured into the vehicle's heating system. A Renault Logan car requires at least 5 liters of coolant, and it is better if it is SINTEC fluid, which is of high quality and reasonable price (500 rubles for a five-liter canister)
It is absolutely forbidden to start the engine without coolant.
After pouring the required volume of antifreeze into the system, the car engine starts and runs for 10 minutes. After this, it is necessary to inspect all connections, clamps and pipes of the heating system. If the coolant does not leak anywhere, it means that the installation of the new furnace radiator was successful.
So, replacing a faulty radiator is not as difficult a task as it might seem at first glance. It can be much more difficult to determine that the stove has stopped heating precisely because of problems with the radiator. The only problem that a novice car enthusiast may have may be associated with the fragile PCB of the mounting plate, which must be handled very carefully. Otherwise there shouldn't be any difficulties.
Troubleshooting minor problems
If “alarming symptoms” occur, it is necessary to consistently check the condition of the antifreeze and the vehicle components described above. If air pockets are detected in the system, they must be vented. Clogged filters and caps should be cleaned or replaced. Used antifreeze must be drained and new one added. The expansion tank can also be changed; in this case, it is better to leave the “original” lid - it will hold pressure better.
If the manipulations done do not have an effect, then the problem lies in one of the heater components.
Renault Logan heating system device
The main component of an automobile heating system is the heater heat exchanger, a more common name is the heater radiator. Its purpose is to heat the air entering the car interior to the temperature set by the driver or his passenger. The radiator heats up due to the circulation of antifreeze.
Another component of the heating system is an electrically driven fan. The fan provides air from the street and regulates this process.
The system has a damper for regulating the temperature of the air entering the car interior from the heater. Depending on the angle of rotation of the damper, the amount of air passing through the heat exchanger of the heater and the amount of outside air entering without entering the heat exchanger are regulated.
You can also indicate the presence in the system of dampers for distributing the air flow entering the car interior through air ducts from the heater. Simply put, the air that blows onto the windshield and side windows.
Find out more about the new Logan
- Cleaning the crankcase ventilation system - First maintenance (TO-1) - Renault Logan (Renault Logan) repair and maintenance
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USING THE AIR CONDITIONER
To turn on the air conditioner, press the switch button (see above) with the engine running. At the same time, the indicator in the button lights up. Press the button again to turn off the air conditioner. On long climbs or in heavy city traffic, operating the air conditioner may cause the engine to overheat. Therefore, if the coolant temperature exceeds the permissible value, the air conditioner should be turned off. If the car is parked in direct sunlight, open the windows and ventilate the interior before turning on the air conditioning. To prevent the windows from fogging up in rainy weather, move the air distribution control to the position (with the heater off) and turn on the air conditioning. If there is no need to turn on the air conditioner, then it must be turned on once every two weeks, for a few minutes, even during winter operation at low subzero temperatures. This helps maintain lubrication on compressor parts and seals, which extends the life of the air conditioning system. When parked in the sun for a long time in hot weather, the air temperature in the cabin is much higher than the outside temperature. To quickly cool the interior, you need to open the doors for a while to allow hot air to escape. Then start the engine, turn on the air conditioner in maximum cooling mode and close the doors. After boarding the cabin, you should switch the air conditioning to the most favorable mode: it is recommended to maintain the difference between the internal and external temperatures within 5–9 °C. It is best to direct the cooling air flow upward, and never into your face. This can cause colds and inflammation of the facial nerves. The maximum interior cooling mode is recommended to be used in hot weather or after the car has been parked in the sun for a long time. This mode is implemented as follows. Air recirculation mode is turned on. The air flow distribution regulator is moved to one of its positions; The air temperature regulator is turned to the extreme position counterclockwise; fan operating mode switch - to position “4”; the air conditioner is on.
After parking the car for a long time in hot weather in the sun, when turning on the air conditioner, do not direct the flow of cold air onto the windshield to avoid the formation of cracks.
