A heating system that uses the heat of the coolant is responsible for heating the interior of the VAZ 2107. This scheme, recognized as optimal for cars with internal combustion engines, has been used in cars since the mid-20th century.
Like any car component, the VAZ 2107 stove may stop working. In winter, such a breakdown makes the car impossible to operate: the windows sweat or become covered with frost, which impairs visibility. For effective repairs, you need to have a good knowledge of the interior heating system.
Design and operation of the VAZ 2107 heating system
The system includes the following components:
- Heater VAZ 2107, whose task is to heat the air. The main element of the heater is the radiator, through which coolant circulates.
- A fan that directs heated air into the cabin. It is attached to the casing using elastic pads that dampen vibration.
- Heater control system, including a fan button, handles and dampers for the heating mode control system.
The heating system works like this:
Through the grilles on the hood, air enters the air supply box located in the engine compartment near the windshield.
In the event of rain or downpour, the water is separated from the air and flows into the holes in the box. This allows you to use the stove in any weather, but until the radiator heats up, the air entering the cabin during rain will be damp.
The air flow is directed to the VAZ 2107 heater and heats up as it passes through the radiator. Heating is regulated using a tap, which regulates the amount of coolant passing through. The crane is controlled by a flexible rod attached to the control lever.
While driving, the air flow enters the engine compartment and the air independently enters the heater. When stopping or at low speed, an electric fan is used, controlled by a switch that has three positions: “off”, “full speed” and “low speed”. Reduced speed is achieved by turning on the electric motor through a resistor, which reduces the voltage on the motor winding.
After the radiator, the air enters the air ducts and exits through deflectors, which allow you to change the direction of flow. Warm air can be directed onto the windshield and side windows, under the feet of the driver and front passenger.
Control elements of the air flow from the VAZ 2107 stove:
- Fan air distribution cover that regulates air flow.
- Levers and handles that change the position of the air supply covers and dampers that regulate airflow.
Before repairing the VAZ 2107 stove, it is necessary to understand the causes of the malfunction.
Control mechanism
The control of the VAZ 2107 stove is mechanical. It consists of a fan switch and a block of sliders. The control mechanism is installed on the center console at the top, which provides easy access to the elements.
There are three sliders of the control mechanism, and each of them controls its own element:
- The top one is responsible for supplying antifreeze to the radiator and is connected by a cable to a tap installed on the inlet pipe. The extreme left position of the slider means the tap is closed (the stove does not heat), the right position means the tap is open (antifreeze enters the radiator).
- Middle – air supply damper control. When you move it to the left, the damper shuts off the air supply from the street (closed air circulation in the cabin), while the right position means the air flow is open (air from the street enters the cabin).
- The lower one controls the damper for distributing the flow through the air ducts. Left position - the flow is supplied through the side and central deflectors, right - to the windshield area. Each of these sliders can be adjusted to any position to achieve optimal stove operation.
Malfunctions of the VAZ 2107 stove and how to eliminate them
If the VAZ 2107 stove does not heat up and when the heater is on, the air leaving the deflectors remains cold, the reasons may be as follows:
- Airing the cooling system. This can happen when replacing antifreeze or repairing cooling system components. To restore heating, you need to remove the air plug.
- The heater valve in the open position continues to shut off the line. The reason for this is a clogged faucet or the formation of scale in it due to the use of water in the system instead of antifreeze. To restore the heater's functionality, the tap must be removed and then cleaned or replaced with a new one.
- The stove remains cold when the tap is open. The cause of this phenomenon may be a non-working pump. This breakdown quickly makes itself known through rapid overheating of the engine; it is impossible not to notice it. If the engine is warmed up to operating temperature, and the pipes leading to the VAZ 2107 heater remain cold, the pump needs to be repaired. One of the reasons why the pump will not work is a slipping or broken alternator belt.
- The air is cold and the supply hose is hot. This is a common problem resulting from clogged radiator honeycombs. They can become clogged due to scale build-up, oil in the antifreeze, or the use of “leak stop additives.” In this case, the VAZ 2107 stove must be dismantled and washed.
- The radiator pipes are hot and the air is cold. This occurs when a baffle in the radiator moves and creates a straight path between the inlet and drain pipes. You can restore functionality by replacing the radiator.
Another type of breakdown is an antifreeze leak. This manifests itself in the appearance of condensation on the windows or leakage of antifreeze into the passenger compartment under the feet of the passenger and driver. The reasons here are:
- Antifreeze is leaking through the heater valve. In this case, it can be replaced without removing the radiator.
- The leak occurs through a burst pipe. The solution is to replace the pipe with a new one.
- The heater radiator is leaking. In this case, repairing the VAZ 2107 stove involves soldering or replacing the radiator.
If there is a leak of antifreeze due to a breakdown of the heater, repairs must be carried out immediately - the ethylene glycol contained in antifreeze is toxic and inhaling its vapors causes serious harm to the body.
Reasons for decreased performance
In addition to obvious malfunctions due to which the stove does not work or functions incorrectly, there are other problems with the heating system of the VAZ-2107 interior. The main one is a decrease in stove performance.
If the stove heats poorly, then the reason lies in:
- Malfunctions of the power plant cooling system (reduced pump performance, stuck thermostat).
- Radiator clogged.
- Formation of an air lock in the heater radiator.
- The air intake damper seal is worn out.
To find the cause of decreased performance, start by checking the heating of the heater radiator. To do this, heat the engine to operating temperature, fully open the antifreeze supply valve to the stove and hand check the degree of heating of the supply pipe before and after the valve and the radiator itself. If the pipeline is hot before the tap, but not after it, the tap is jammed. If the radiator does not warm up, the reason lies in severe clogging of the heat exchanger or a plug in it. If the pipeline does not warm up even to the tap, inspect the cooling system.
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If the radiator warms up well, but it is noted that the stove heats worse, then check the functionality of the air intake damper and the condition of its seal. It wouldn’t hurt to check the stove body and air ducts for leaks and cracks.
To ensure that the VAZ-2107 heater heats well, before the winter period check the functionality of the tap, replace the antifreeze (with flushing the system), inspect the control mechanism and the functionality of the dampers.
Dismantling the heating radiator VAZ 2107
To do the job you need a Phillips screwdriver and a set of wrenches (open-end and socket).
Sequence of operations:
- loosen the heater hose clamps located in the engine compartment;
- remove the hoses from the heater radiator pipes (this may result in a slight leak of antifreeze);
- unscrew the screws securing the rubber seal;
- remove the seal;
- unscrew the radio panel;
- disconnect the cable from the tap of the VAZ 2107 stove;
- Using a screwdriver, remove the brackets on the fan casing;
- lower the casing down;
- remove the heater radiator.
Repair of heating radiator VAZ 2107
Often, repairing a VAZ 2107 stove involves replacing or repairing the heater radiator. Repair actions depend on the type and cause of the malfunction:
A clogged radiator can be flushed with water pressure. Scale on the walls of honeycombs can be removed using a special product that dissolves it.
A leak in a copper (brass) radiator can be soldered. Using a powerful soldering iron and solder, you can repair a hole or crack. Leaking aluminum radiators must be replaced.
Important: to eliminate a leak in the heater radiator or engine cooling system, you should not use products added to antifreeze - they can cause clogging of the VAZ 2107 radiator honeycomb.
How to turn on the stove
The stove on the VAZ 2107 has: in fact, a toggle switch for the rotation speed of the stove fan, and three sliders - we’ll dwell on them in a little more detail. Upper: position all the way to the right - fully open the stove tap (maximum temperature); Middle: to the right all the way - air intake from the street, to the left - from the cabin. As a rule, it heats up faster when taking air from the street. Lower: extreme left position – heated side windows, right – heated windshield.
With this position of the sliders it will be warm.
If the stove shows no signs of life, it would be a good idea to check the fuses - there is an electrical diagram in the book for the car. If this is too difficult for you, you can go to an auto electrician.
Can the stove break?
Nothing lasts forever, and the stove on a VAZ 2107 can also fail. Let's briefly consider the main causes of breakdowns:
- on a new car:
1 – Electrical fault: fuses, heater motor, switch fault. 2 – Air lock (occurs when replacing coolant).
- on an old car:
There are a few more reasons here. With an old car, the troubles described above and several other problems can occur.
1 – The stove radiator is clogged (the honeycomb is clogged). 2 – Thermostat malfunction. 3 – Malfunction of the liquid supply valve.
What is needed to fix a malfunctioning stove?
If you repair the car yourself, then some problems can be fixed yourself. If not, go to the service station. If the heater does not turn, check the fuses, heater switch. Please note: after our “Kulibin Homegrown”, the following may happen - the stove will only work when the ignition is on - do not forget about this.
If there is no heat, the problems are as follows: thermostat, air lock, heater valve. If the stove tap opening slider moves heavily, try opening the tap manually - it may be stuck. There is a faucet on the passenger side next to the heater radiator - try opening it. I want to disappoint you: the standard taps are of disgusting quality, and it may happen that the tap turns but does not open - then the only option is to replace the tap.
An air lock occurs when replacing the coolant. The solution is the following: place the car on a flat surface and let out the air.
Thermostat malfunction. In this case, the interior heats up very slowly when the engine is cold, but everything is fine while driving. The thermostat may be faulty and causing fluid to circulate in a large circle. Without going into details, I will say that this option is bad both for the engine and for you, in terms of heat. It is better to replace the thermostat at the station, or at least get advice.
The honeycombs are clogged. The problem with old cars is when scale appears in the radiator honeycombs, which impairs fluid circulation. Either remove the radiator and wash it, or replace it with a new one.
And the last thing: if the stove hums, but does not heat. After all of the above, I’ll add again: perhaps the reason is hidden in the incorrect location of the stove control sliders . The purpose of the three sliders was described above. Check to see if your windshield heating is turned on - the heater seems to be working, but the air in the cabin heats up too slowly. Author: Igor Especially for the site “behind the wheel after 30″.
Heater assembly VAZ 2107
The repair of the VAZ 2107 stove is completed by assembling the heater. They assemble it in the reverse order of disassembly. The work has a number of features:
- rubber gaskets must be replaced with new ones and lubricated with silicone sealant;
- before assembling the heater, it is necessary to attach the pipes and tap to the radiator;
- Do not overtighten the nuts so as not to crush the gaskets;
- before putting on the rubber hoses, the outer surface of the metal radiator pipes must be treated with sealant;
- After the VAZ 2107 heater is assembled and connected, you must remember to add antifreeze to the system and check its tightness.
Important: repair of the VAZ 2107 stove must be carried out in conjunction with checking the serviceability of the engine cooling system components. This approach allows you to accurately determine the cause of the breakdown and reliably eliminate it.
Let's sum it up
Timely diagnostics, preventive cleaning and inspection of elements of the vehicle’s heating system is a guarantee of high-quality operation of the stove. Experts recommend checking the heating system on the VAZ-2107 at least twice a year - in autumn and spring. Any driver can handle preventive cleaning and adjustments of the stove on his own; to do this, you just need to understand the structure of the heating and ventilation system of the cabin and the principle of its operation. The easiest way to do this is to always have a visual instruction manual for your car nearby.
Don’t put off any further work to improve the functioning of your car’s heating system. Proper care will ensure uninterrupted operation of the heater and a comfortable temperature in the interior at any time of the year.
