On a Lada Priora car, the heater is no longer just a stove. In fact, this is a full-fledged climate control device. In terms of its characteristics, the Priora stove is not inferior to foreign devices of this type. But like any mechanism, the Priora stove can fail. This article provides an overview of the heater and the features of its repair.
Features of the Priora stove
The climate control of this car on some versions is designed for the installation of air conditioning. Therefore, the design of this device in this case is slightly different than that of the VAZ-2110 heater. This article discusses the standard heater option. Although they have a lot in common. The Priora stove (heater without air conditioning) includes the following large components:
- Stove body.
- Air duct system.
- Heater electronic control unit (ECU) with control console.
These are, so to speak, three basic nodes. All of them, except the ECU, can be disassembled and consist of various subsystems. To be honest, the control unit can also be disassembled if desired. But you shouldn't do this. This is a delicate electronic device and can only be repaired by a specialist. But with the other two there are options.
Frame
After the control unit, the stove body is the most complex object. The fact is that it includes several elements:
- Housing consisting of two parts.
- Blower electric motor with fan.
- Small heating radiator with pipes.
- Variable resistor.
- Heater air damper.
- Micromotor gearbox, heater damper drive.
- Cabin filter.
Attention! The Priora, equipped with air conditioning, has additional climate control elements, but this is a separate topic not covered in this article.
All of the listed elements sometimes fail, and it is quite possible to replace them yourself, without resorting to the services of a specialist.
Location and access
As on the VAZ 2110 model and modifications, the heater is located outside the passenger compartment. It is located in the engine compartment. Right under the windshield. It is separated from the engine by a special fabric and cardboard partition. And the top is covered with a plastic double casing, which hides this compartment, in which, in addition to the heater, a brake vacuum and a windshield wiper drive are also installed.
To gain access to the Priora stove, these elements must be dismantled. Disconnect the cooling system hoses. Unscrew the 3 fastening nuts and remove the housing. This process is described many times and shown in the attached video. Therefore it is not worth repeating here.
Cabin filter
Most often, it is this part that fails or exhausts its resource. It simply gets clogged with dirt and dust. This is expressed in a decrease in the intensity of fan operation. Sometimes, it becomes so dirty that the heater fuse blows. The load on the electric motor increases so much that the fuse simply blows. The purifier is located at the air inlet into the heater. Near the right wing of the car. It is closed with a decorative plastic cover.
Important! Don't wait for contamination. It is recommended to periodically replace the filter 2 times a year. In spring and autumn.
Electric stove motor
To remove and replace the electric motor of the stove, on a Priora without air conditioning, you have to completely dismantle the heater. Or at least push it forward a little. The fact is that this motor is located on top of the Priora stove and is located under the supporting part of the windshield.
Heater resistor
This element serves as a kind of fan rotation speed switch. It has several resistance levels. Each step is speed. A faulty resistor is easy to determine. If none of the speeds except the maximum one work, then in 99 cases out of 100, it is the resistor. And only 1 switch, in the control unit.
It is also located at the top. But it can be easily removed without dismantling the entire stove. It is enough to remove the connector and unscrew 1 screw fixing the resistor. That's all.
Micromotor gearbox
In the Priora climate control system, there is no option to disconnect the radiator from the car’s cooling system. That is, the hot liquid constantly circulates in it. The supply of cold air is ensured by directing the air flow from the fan using a special damper that blocks the radiator and allows the flow to pass by.
This part is moved by a special device - a micromotor-reducer. It is controlled by the control unit. It can also be replaced without completely removing the heater. Although it is located between the vacuum brake booster and the heater housing. However, its diagnosis and replacement has features that will be described in a separate topic.
Heater air damper
One of the key devices of the system, despite its simplicity. The damper moves on an axis rotated by a micromotor gearbox. Located inside the Priora stove. Therefore, to repair or replace, naturally, the stove must be dismantled.
Attention! The first samples of dampers made of plastic needed repair. Currently, aluminum dampers are installed on Prioras. Therefore, there is no need to repair or replace them.
However, if you still have a Priora with a plastic flap, then the drive protrusion on it may break off. This is quite easy to determine. Turn on the ignition, and having removed the casing separating the niche with the heater from the engine compartment, observe the gearbox, switching the flow temperature control handle from hot to cold. You can see that the drive rod rotates, but the temperature does not change. This means the damper needs to be replaced. There will be a separate article about this procedure.
Radiator
And the main heating unit is the stove radiator. It is also located on the right side, near the damper drive. Naturally, to replace it, the Priora stove will have to be removed. It is attached to the body with three self-tapping screws. And after removing the heater, it is easy to pull it out by unscrewing these screws. Clean the radiator seat and install a new one. This part is made of plastic and aluminum and cannot be repaired. Replacement only.
Important! When replacing the radiator, be sure to use a special adhesive sponge; it is glued to the sides and end side of the radiator. This is necessary to avoid the formation of cracks from impacts on the stove body.
Determining a radiator leak is quite simple. Although on these heaters the coolant does not enter the cabin when there is a leak from the radiator, but when it appears, in any position of the damper, the evaporation immediately falls on the windshield. They form a clearly visible cloudy film with a pungent odor of antifreeze. This a clear signal for replacing the heater radiator.
Electronic heater control unit
This is a mini-computer with its own program. The convenience is that it is initially connected to the computer diagnostics channel. Therefore, many faults can be identified by connecting diagnostics to the Priora diagnostic connector. But this interesting topic will be described in a separate article.
Useful video on the topic “Removing the Priora stove”:
Why doesn't the heater work on the Lada Priora?
The Lada Priora is in many ways similar to its progenitor, the VAZ of the tenth family, including the design of the heater. The manufacturer decided to leave the operating principle of the stove, replacing only some elements with new ones. At the same time, Lada Priora also inherited familiar problems, for example, when the stove does not heat and blows cold air.
Heating system elements (stoves)
The fact that the Priora stove is 95% similar to the “ten” can be seen by the catalog numbers:
- Heater assembly (2170-8101012 or 2111-8101012-10).
- Air flow distribution gearmotor (2170-8127100). Distributes air flow to the feet/face/windshield. Located inside the dashboard.
- Interior air temperature sensor (11186-8128050). Located on the ceiling.
- Heater control controller (HCU) or stove control unit (21703-8128020). The block on which the driver sets the operating parameters of the stove. Located on the panel.
- Additional resistor or additional resistor (2123-8118022). Determines the rotation speed of the stove fan. Secured in the engine compartment.
- Electric heater fan (2111-8118020). Located under the hood.
- Heater damper motor reducer (2110-8127200). Distributes air flows into the cabin (outside/heater radiator). Inside the heater assembly.
- Air filter (2110-8122020).
- Heater radiator (2110-8101060). Located inside the heater.
A malfunction of one of these elements causes problems in the operation of the stove.
Operating principle of the stove
To independently determine a heater malfunction, you should understand the principle of its operation.
The heater control controller receives a signal from the temperature sensor in the cabin and compares it with the temperature set by the driver. If there is a difference, then the KUO sends a signal to the heater gear motor (located under the hood) so that it closes or opens the heater dampers by a certain amount for a greater supply of cold or hot air.
After setting the required heater fan speed, the heater control controller sends a signal to an additional resistor (in the engine compartment), which, due to the built-in resistance, sends an adjusted signal to the fan. At maximum speed, the resistor is not used and the electric fan rotates at maximum speed.
The air direction (face/legs/windshield) is determined by the driver by setting the required value on the control unit. After this, the signal is sent to the air flow distribution gearmotor (inside the panel/dashboard), which moves the flaps in the desired direction.
If the stove blows cold air (does not heat)
There may be several reasons why the Priora’s stove does not heat well (the percentage of breakdowns based on the results of a survey among owners of this car is indicated in parentheses):
- There is a malfunction in the engine cooling system (the heater radiator is cold and cannot give off heat). Touch both heater core hoses; they should both be hot. Sometimes the reason lies in the radiator itself (defect, insufficiently productive) (8%).
- Dirty cabin filter. Try removing the filter for a while and checking the operation of the stove (2%).
- The heater damper does not work, it is simply jammed (17%).
- The heater gear motor is faulty (16%).
- The interior air temperature sensor is faulty. Try turning it off for a while and check the operation of the heater (6%).
Points 3-6 may also be the reason when only hot air is constantly blowing from the stove.
Mode switch does not work (face/legs/glass)
Possible reasons (the percentage of breakdowns based on the results of a survey among owners of this car is indicated in parentheses):
- The heater control controller is faulty (13%).
- The gearmotor for air flow distribution inside the cabin is faulty (8%).
The stove only works in position 4
If the first, second or third position of the heater does not work, then (the percentage of breakdowns based on the results of a survey among the owners of this car is indicated in parentheses):
- The heater resistor is faulty (7%).
- The heater control unit is faulty (13%).
If the stove is noisy
The electric fan bearing may be humming (17%). Also, additional noise can be caused by a dry leaf caught under its blades.
The stove does not turn on
- The fuse for the stove F9 (25A) has blown.
- The heater control unit is faulty (13%).
Conclusion
A car heater is not a simple system, and according to reviews from owners, it is not entirely reliable. Try to determine if the stove is malfunctioning by checking it and then replacing parts with known good ones. Do not forget that the reason may be poor contact or a break in the car wiring.
We have already written that the heater of the VAZ 2110 and the Lada Priora are very similar, perhaps you will find a lot of useful information on their website. What problems did you experience with the stove? Did you manage to solve them? By participating in the survey, you help other car enthusiasts identify the reasons. Read also other articles on the repair and operation of the Lada Priora.
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In the winter months, you need to find out why the stove is not working and cold air is blowing on a Priora (or other domestically produced car) as quickly as possible. Of course, you won’t turn into ice and don’t risk freezing anything. But driving with the heating not working is, at a minimum, unpleasant and fraught with all sorts of colds.
And driving out onto the highway is completely dangerous: God forbid, something breaks, you will really freeze until help arrives. Priora is the generally recognized descendant and successor of the Lada “ten”.
And the manufacturer did not make any fundamental design changes to the stove; only individual elements were changed. Accordingly, the diseases inherent in the ancestor were inherited by the descendant. All Priora owners unanimously assure that the heating system in it is very unreliable and can break down in several components. The worst thing is that in the summer few people remember about the stove and are puzzled by checking it. Therefore, discomfort is detected suddenly and requires lightning-fast action.
Why doesn't the heater work and blows cold air on the Priora? There are many reasons for this. In descending order of frequency of cases, they can be arranged as follows:
- The stove damper is stuck. It does not open and does not allow warm air into the cabin. By the way, the opposite option is also possible: if it is closed in the open position, you begin to feel like you are in a sauna;
- The heating gear motor is broken;
- The stove control unit does not work;
- Problems in the engine cooling system;
- The temperature sensor in the cabin has broken down, and the heating system simply does not know that you are cold. Again, in a similar but opposite case, it may be hot.
Clogged filter
Experienced Prior owners have developed an algorithm of actions to find out where the heating system is leaking.
First approach
Before all checks, you need to make sure that the fan is working - it would be unreasonable to go deeper if the main element does not spin. The next steps are as follows.
- The engine heats up to the desired temperature;
- The pipes leading to the heater are probed. Both are hot - okay, one is at ambient temperature - which means there is no filler circulation;
- The hood opens, the tap is located and turns to another position. If it has become stuck, you will have to soak it immediately.
- The system is checked for leaks. The detected ones are eliminated: a constant lack of coolant is also the cause of cold airflow;
- The tap is working, there is no leak - the plug is removed from the tank and the liquid level is checked. Often an air lock forms in the tank; in this case, the coolant is topped up to normal, and the gas pedal is pressed sharply several times. The fluid circulation will resume and squeeze the plug out of the reservoir;
- To make the last step more effective, it is better to drive the front end onto the nearest hillock so that the car’s radiator is lower than the stove radiator.
Second approach
When (or if) both pipes are filled with hot liquid, we move on to the dampers.
- Again you will have to climb under the hood, this time to observe the operation of the damper;
- If it is warped or jammed, you can try to gently shake it with your hand from inside the cabin. To do this, remove the central deflector and unscrew the plastic guides to reach the stuck element. Access is only possible for a thin limb, so it is advisable to invite a female person to the procedure if she does not mind;
- If there are serious problems with the damper (the fastenings have rusted, the plastic has warped due to temperature or it has cracked), alas, you will be faced with difficult work: you will have to disassemble half of the heating system.
Third approach
The microreducer is a complete headache. First, its status is checked:
- The left handle is moved to the “min” position. After a 15-second wait, the engine starts;
- The controller that monitors the self-propelled guns is disconnected;
- The tester takes readings on both contacts. The resistance should be 800-1200 Ohms for units 1303.3854; 1313.3854 and 1333.3854; for controller 1323.3854 the norm is 3600-5000;
- The same operation is carried out in the “max” position. Now the data is in the range of 3200-3500 for the first group and 1200-1600 for 1323.3854;
- If there is no resistance or its unchangeability, the track on the sensor has been erased. It is not sold separately, so you will have to change the entire MMR. It is clear that not all the reasons why the stove does not work and cold air blows on a Priora can be eliminated on your own.
The main reasons for stove failure in Lada Priora:
- if air got into the heating system when you replaced the coolant or if the main cylinder block was damaged;
- if the stove heats poorly when moving quickly, but well at low speeds, then the problem is the thermostat is in the open position;
- if the stove radiator is clogged, as insects, leaves, dust, sealant, water or low-quality antifreeze can get there;
- in case of contamination of the cabin filter;
- if the fan itself fails;
- when bearings or brushes are worn;
- problems with electronics;
- if the radiator damper is damaged, there is no air access to the system;
- the heater tap lever has worked because the rubber bands have dried out, and in this case it needs to be replaced with a new one along with the heater radiator;
- the upper pipe is broken, it cannot be repaired, only replacement with a new one;
- the stove control unit may break down and the fan may not operate;
- Air temperature sensor malfunction.
Over the entire period of its existence, the Lada Priora has been constantly improved. More and more new models are appearing.
For example, a Priora hatchback car has the maximum equipment: ABC, climate control, heating, parking sensors, standard music and much more. Its advantages are a fast engine, fuel consumption, reliability, a good stove and starts in any frost. The seat behind the wheel is very comfortable - your back doesn’t get tired and your legs don’t get numb. Previously, the Lada Priora had one engine - a 16-valve engine producing 98 horsepower. Now Lada Priora consists of two 16 valves and produces 98 and 106 horsepower.
The Lada Priora stove does not heat well with or without air conditioning
Nowadays, a Lada Priora equipped with an air conditioning system will not surprise anyone. Air conditioning is an additional installation that increases the cost of the car. It may be included in the package, or it can also be purchased after purchasing the car. This car only recently became equipped with air conditioning.
When buying a car, it’s worth considering whether air conditioning is needed in the kit. Suppliers of air conditioners for this car are Panasonic made in Taiwan or Korean Hello. These two types of air conditioners with their parts were developed by contractors and look basically the same in appearance. When replacing a filter or belt in an air conditioner, you need to know its model and filter size.
Often Russian car enthusiasts who drive a Lada Priora complain that the heater is not working well, the vehicle interior is cool, and the car’s side and windshield windows are freezing. In order to understand why the stove on the Priora stopped working, let’s look at the design of the entire heating system on cars of this modification.
Priora interior heating system
The vehicle is equipped with a stove (heating system) with a climate control system that provides comfort while traveling in the car. They are designed to eliminate problems in the event of cold weather or other weather changes. No one will ask the question why the stove in the Priora does not work, neither the driver nor the passengers.
The car's climate control system includes:
- the stove itself (heater);
- stove fan device;
- temperature sensor in the cabin;
- air distributor housing;
- airways;
- deflectors (directing the flow of air masses).
The air flow from the stove is transmitted to the housing part of the air distributor, from where it is directed along air lines. Through the air ducts, the flow flows to the windshield grilles of the windshield and side windows, to the air mass flow guides in the center and side of the dashboard, as well as to the lower plane of the cabin to the floor pans on the bottom of the body. With the advent of frost, defects in the heating system appear, the most unpleasant of which is that the Lada Priora stove does not work and other malfunctions.
Car heating system malfunctions
In a Lada Priora car, the heater regulator does not work due to a malfunction of the multi-position switch or a defect in the blower fan. When troubleshooting this problem, when the Priora stove fan does not work, you should look at the fuse box, which is the main source of trouble for the operation of the ventilation device. Many defects in a car's climate system are directly related to the operation of the vehicle's cooling system.
If the fan device is in good working order, but the stove on the Priora does not heat well, then the defect should be looked for by a sequential method of cutting off the tested elements. So, the stove on the Priora is not working well and the interior is quite cool:
First stage: with the engine brought to the optimal temperature, we check the 2 pipes connected to the heater for temperature values. If both products are hot, then there is no circulation of air masses, and if one pipe is hot and the other is cold, then this indicates a lack of circulation of the aqueous solution in the system. We carry out diagnostics of the heater tap in order to deal with the cooling system solution (water, antifreeze).
For this purpose, open the hood and move the tap from one position to another. If there is a leak from the heating system, then it must be eliminated, because... an insufficient amount of coolant can provoke a situation where cold air blows from the Priora’s stove and the cabin becomes cool. If the tap is rusty and cannot be adjusted, you can leave it in this position during the summer when the heating system is not in use. Closer to cold weather it needs to be replaced.
Second phase: when the tap is in the working position and the stove refuses to work, remove the filler plug of the radiator tank and check for the presence of coolant fluid. In case of formation of the so-called “plugs from the air”, we bring the coolant level to the maximum value (sometimes it happens that in a Priora cold air blows from the stove due to a lack of coolant). After this, we turn on the power plant and sharply press the accelerator pedal several times, which will provoke a coolant circulation and, under its influence, the water pump will squeeze out the air layer plug.
In order for the air masses to move faster to the output level, it is necessary to drive onto an elevation so that the radiator is lower than the radiator of the cooling system. So, cooler circulation has been restored, 2 pipes have become hot, but the stove on the Priora still doesn’t work well?
Third stage: the dampers may not be working, because an open lever on the instrument panel does not mean at all that the dampers have duplicated this command. Failure of the dampers may be associated with loosening of the fastenings of the heater rods and taps, which blocks them in summer mode.
With the hood open, it wouldn’t hurt to check whether the Priora’s heater dampers are working or not, and also to clean the heater from last year’s debris and leaves. If, even after these cleaning measures, the system does not work well or does not function at all, then we go directly to the pipes.
Fourth stage: we check the temperature conditions of the pipes with the stove on. If the fan is in working condition, two pipes are hot, but one begins to cool down after a while - it is necessary to change the water pump due to poor coolant circulation. Some car enthusiasts manage to install a small water pump under the heater radiator.
Having started testing the heating system, we bring the technological process to the end:
- The coolant level in the expansion tank should be between the “min” and “max” marks.
- We test the coolant circulation process in the expansion tank. Its absence is determined as a defect in the water pump or clogging of the cooling complex.
This completes the diagnostics of the heating system.
