Why the Lada Priora heater fan does not work and how to fix it

September 17, 2015 Lada.Online 124 069 12

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:

1. Heater assembly (2170-8101012 or 2111-8101012-10).
2. Air flow distribution gearmotor (2170-8127100). Distributes air flow to the feet/face/windshield. Located inside the dashboard.
3. Interior air temperature sensor (11186-8128050). Located on the ceiling.
4. 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.
5. Additional resistor or additional resistor (2123-8118022). Determines the rotation speed of the stove fan. Secured in the engine compartment.
6. Electric heater fan (2111-8118020). Located under the hood.
7. Heater damper motor reducer (2110-8127200). Distributes air flows into the cabin (outside/heater radiator). Inside the heater assembly.
8. Air filter (2110-8122020).
9. Heater radiator (2110-8101060). Located inside the heater.

A malfunction of one of these elements causes problems in the operation of the stove.

No heating at idle

It is not for nothing that this issue has been submitted for separate consideration, since it worries many motorists and solving the problem can be much more difficult than one might expect. So, you have a Priora, the heater does not heat up at idle, although when the car is moving, the interior is heated in normal mode. Here you can also identify several possible reasons:

1. Insufficient coolant level.
2. Leaks that lead to a decrease in antifreeze levels.
3. There is an air lock in the system.

If the first two problems can be easily diagnosed and eliminated, then with an air lock the situation is much more complicated. If you have ruled out the first two reasons and the Priora’s stove still does not heat up at idle, you need to eliminate the air lock. You must proceed as follows:

1. We remove the screen from the engine.
2. We lower the clamp, after which it is necessary to remove the heating tube for the throttle assembly. We choose any of the two.
3. Unscrew the cap on the expansion tank. We place a clean rag on the neck and begin to blow into the expansion tank. The air supply should be carried out until coolant begins to pour out of the tube, which was previously removed.
4. Immediately place the tube on the fitting and carefully tighten the clamp.
5. Installing the screen.

If the option of blowing out the tank does not suit you, then you can go another way. We warm up the engine so that the pressure in the heating system increases. After some time, we turn off the car and remove the hose from the heating of the throttle assembly. In this case, there is no need to remove the cap from the tank. As a result of high pressure, coolant will be forced through the tube. All that remains is to place the tube on the fitting and tighten the clamp.

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Now the Priora stove should not cause any difficulties; you know how to fix faults, as well as carry out diagnostics and identify the source of the problems. Let the heater in your car always turn on, work properly and provide comfort regardless of the weather outside.

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.

Introduction

One of the most important devices of any car can be called its heating unit; the lack of normal operation of the stove is especially clearly felt in the cold season, when driving in a frozen car becomes simply extremely uncomfortable. In most cases, many malfunctions of the Lada Priora heating device are associated with the cooling system of the power unit. In view of this circumstance, we should first consider the problems that this particular device causes. At the same time, we learn about the structure of the stove itself and its components, which also tend to periodically fail.

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):

1. 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%).
2. Dirty cabin filter. Try removing the filter for a while and checking the operation of the stove (2%).
3. The heater damper does not work, it is simply jammed (17%).
4. The heater gear motor is faulty (16%).
5. The heater control unit is faulty (13%).
6. 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.

We carry out comprehensive diagnostics

Removing a faulty heater from a Lada Priora is not so easy. Even experienced motorists cannot cope with this task quickly. To avoid doing such a large amount of work in vain, it is better to first diagnose the heating system. You must proceed as follows:

1. We probe the channels through which the coolant flows to the heater. They should be warm when the stove is on. In addition, when pressing on the main rubber hoses, resistance should be felt. If resistance is not felt, the pump pump may be faulty. This mechanism is responsible for creating the pressure of fluid flows necessary for normal operation of the heater.
2. A little secret that may be useful to Lada Priora owners: does the stove blow cold air for a long time and does not warm up as quickly as we would like? Then you can try filling coolant to the bottom mark in the tank. In this case, the liquid will warm up faster. If you practice this method, you will need to constantly check the coolant level.
3. If a running heater is a source of noise, then we can talk about a problem in the bearing, which is located on the electric fan. This situation cannot be ignored, since in the future the fan may jam and repairs will take place on a much larger scale.
4. Is the stove not working? Perhaps the problem is hidden in fuse F9 with a rating of 25 A. Its function is to protect the power electrical lines of the heater. A blown fuse must be replaced. If such a situation occurs with enviable consistency, then it is necessary to check all electrical circuits of the heater, the insulation of the windings on the fan and the presence of an overload in the power circuit.

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Heating device design, common breakdowns

If for some reason a motorist decides to change the heater tap on a Priora, he must first understand the air conditioning system of the domestic vehicle, which will allow him to find out the true reason why the unit does not function properly (stopped blowing). In a situation where the heater begins to supply extremely cold air into the cabin, and the car does not have air conditioning, the owner of the movable property must check several important design details. As a rule, first of all, you should pay attention to such elements as the control regulator, fan and stove faucet.

To exclude the possibility of breakage of other parts and to look for the place where the Priora stove faucet is located, you will have to inspect the fan. The functioning of which, in particular the number of revolutions, depends on the temperature inside the car. The difference between warm and cold flow depends on the operation of the valve. As for the air that is supplied directly to the vehicle itself, it necessarily passes through the filter element, thanks to which everything is cleaned. Only after this the driver of the car can choose the direction of the airflow by adjusting the position of the dampers, manipulating the installation using the central console.

Why can a fan fail?

There are several types of malfunctions of the Priora heater fan. The most common are:

1. The heater stopped working completely. In most cases, this is caused by the failure of a 25 A or F 9 fuse. Power is not supplied and the unit does not operate. The second reason may be a malfunction of the heater control unit.
2. Noise during fan operation is most often caused by a foreign object getting into it. Most often, dry leaves get stuck between the blades (especially in autumn), this leads to the appearance of extraneous sounds.
3. Only mode 4 of the stove works; in all others it does not turn on. This failure can be caused by a faulty resistor or control unit.

Priora heater fan does not spin

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Lada Priora. Why doesn't the stove work? | Garage for boys

The heater fan stopped

at positions 1,2,3, the reason is overheating of the thermoelement on the rheostat...

Not every car enthusiast can check and repair a complex stove system. If you are not well versed in auto electrics, then you should turn to professionals. Otherwise, you can use the instructions below.

conclusions

At this point, we can consider the problems of the furnace device on your car to be fairly fully resolved. Almost any motorist who has studied the principle of its operation can repair the stove on a Lada Priora. In the future, the maintenance process consists of sequential diagnostics of its structural parts according to the above diagram. Most faults, such as cold air flows, insufficient heating and others, have a very clear diagnosis, which makes it quite easy to localize and fix the problem.

Replacement: how to remove (change) the stove on a Priora with and without air conditioning

Replacing a stove completely is rarely done; components are mostly changed. Often the main reason for disassembling the heater on a Priora car is replacing the heater radiator. When it ceases to be airtight and no longer works as efficiently, it is necessary to begin repairs. In order to remove the heater on a Priora car without air conditioning, you will need a set of wrenches (socket and socket wrenches) and a Phillips screwdriver. As the system is disassembled, it is worth inspecting all parts and replacing worn ones. Perform the work according to the instructions:

1. Remove the negative from the battery.
2. Remove the lower windshield seals and engine sound insulation.
3. Loosen the clamps that hold the pipes adjacent to the heater core, and then disconnect them. First place a basin under the pipes to drain the coolant. After the liquid has poured out, cover the pipes with a rag.
4. Start wiring. Unclip the latch and disconnect the motor wires. Then de-energize the additional resistor.
5. The wires that go to the damper drive motor are secured with a clamp. You need to bite it and then disconnect the wire.
6. Next, we proceed to dismantling the heater itself. Take a “ten” socket wrench, remove three screws with it, and remove another screw with an “8” wrench.
7. Next, move the wiring harness from the heater to the side (attached to a small bracket).
8. Now, from the passenger compartment under the dashboard, unscrew the third nuts securing the brake pedal with the “13” key, and then move it to the side.
9. Pull the block towards you.
10. Install a new heater instead of the old one if necessary.
11. When you are concerned that the heating is not blowing correctly - not in the required mode - you will have to check everything again during dismantling.
12. To remove the heater on a car with air conditioning, follow these steps:
13. Also remove the negative terminal, then the lower windshield seal, and the engine sound insulation.
14. Unscrew the screws covering the heater radiator.
15. Also carefully remove the pipes: the coolant must be drained into a prepared basin.
16. Slowly and smoothly pull the radiator up until it comes out of the mounts.
17. Install the new radiator in the reverse order.

Lada Priora has Panasonic or Halla air conditioners. They differ only in the fastening, so there will be no difficulties when replacing the heater radiator.