Correct operation of the heater is the key to safe and comfortable movement. For ease of use, the Gazelle Business car is equipped with an electronic heater control unit. All adjustments occur due to electrical impulses supplied from the control unit to the damper gear motor. And he, in turn, redirects the flows in a given direction, opens and closes the stove tap and controls the air mixing damper. The unit is also equipped with temperature sensors, which allows it to automatically regulate the temperature of the air supplied to the cabin. All this is very convenient and does not distract the driver from driving the car while driving. But it happens that electronics fail or begin to work incorrectly.
Heater Gazelle business principle of operation.
The Gazelle Business heater is not a bad parody of foreign car heaters, but only at first glance. The heater is controlled by buttons and knobs on the electronic unit located on the control panel. The air in the heater, as on all Gazelles, is sucked in by an electric fan through the grilles under the windshield and, passing through air ducts and deflectors, enters the cabin.
Coolant is supplied to the heater radiator through a tap, the opening and closing of which is carried out by an electric drive. It is distinguished from the same taps of previous models by the presence of an additional fitting. When the valve is closed, the liquid is redirected back to the cooling system.
System modernization
The main problem that causes electronics to fail is moisture. And in the tap the liquid circulates constantly, even when the shutter is closed. And when the oil seal leaks, liquid floods the entire electrical part, and it fails.
Installation of shut-off valves
To avoid this, you can install conventional shut-off valves, fitting them to the outlets of the cooling system. But in order to open or close the supply of hot liquid, you need to move the tap to the desired position manually. And since it is installed under the hood (in a regular place), it is not possible to do this while driving. But this mechanism has a much greater resource.
Pre-sealing
Before installing a new electric faucet, you need to disassemble it and fill the electronic board with hot glue to avoid moisture getting on it, coat all joints with sealant. This method can only prolong performance, because if liquid gets into the electronic part, the electric motor will be damaged, without which the mechanism will not be able to function correctly.
Heater Gazelle business device.
The tap is controlled automatically by the heater control unit depending on the selected temperature. In addition, the temperature of the air supplied to the cabin is regulated by a central damper, which, by turning, directs the air flow, or part of it, through or bypassing the radiator.
In addition to the central damper, there are a number of dampers that redistribute the air flow. The dampers of the Gazelle Business heater, unlike previous models, are controlled by gear motors, not cables. The control is carried out by the heater control unit. The electric heater fan is located inside the housing and to access it it is necessary to remove and disassemble the entire heater. Despite the fact that the fan electric motor is imported, this arrangement completely negates all the advantages of the heater.
The speed of the electric motor is regulated smoothly by turning the handle on the control unit, due to the electronic regulator located on the heater body. To access it, as well as access to almost all elements of the heater, you need to remove the front panel completely. The only thing that can be changed without removing the panel is the heater core. To change it, just remove the glove compartment.
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Design
On the Gazelle Business, the control of the interior heating system is combined and is carried out both manually using levers and using push-button control from the instrument panel.
The heating operation scheme is standard - air enters through the frontal air intakes by being sucked in by a fan with an electric motor, after which it passes through a system of deflectors and enters directly into the car cabin.
Coolant flow into the heater radiator
is controlled by a damper, the angle of which is driven by an electric motor. The electric motor of the damper drive is Italian-made, which does not at all guarantee against its breakdown, which often happens to it on this Gazelle brand.
Engine control
The damper tap is operated in automatic mode and depends on the set air temperature at the outlet. The design of the stove also includes a damper, which is controlled by an electrically driven gearmotor and can direct part of the air flow bypassing the radiator.
This is one of the main differences between the heater of the Business model and later Gazelles, on which the angle of the dampers was changed using a cable system.
The imperfection and ill-conceived design of the heater leads to the fact that when the stove on a Gazelle Business does not heat, it takes a long time to look for the cause of the malfunction. If the car is under warranty, the best option would be to contact a service station.
Heater Gazelle business
Heater Gazelle business troubleshooting.
What to do if something in the heater does not work? Due to the design of the heater, diagnostics in case of failure of its parts is difficult. Initially, as always, you need to check the fuse.
Checking gearmotors.
Checking the gear motors of the windshield blower dampers and deflectors can be checked without completely removing the panels. It is enough to remove its lower part. The main damper motor is accessible from the driver's side. To check gearmotors, you need to disconnect the connector of its electric motor, the connector with a lock, and connect a tester to it in voltmeter mode or a test lamp. With the ignition and heater on, you must press the button that controls this damper. The control lamp should light up. If the lamp is on and the gearmotor does not work, it must be replaced.
Radical changes to the electrical circuit
In particular, the electrical wiring of the Gazelle 3302 has changed significantly due to the appearance of long-awaited elements:
- Diesel engine;
- ABS in the brake drive;
- Air conditioning;
- Cruise control.
Diesel Gazelle
With the advent of long-awaited diesel engines in the line of power units, in particular, a Cummins engine made in the USA, the electrical equipment layout has also changed.
Although the diesel engine is free of the ignition system traditional for gasoline engines, its design contains a lot of other electrical components, among which the main ones are:
- Fuel pump control unit;
- Exhaust gas afterburning system control unit.
Caution: using non-standard firmware for the engine control unit is not recommended, since the factory settings are designed to balance the different torque of the engine and gearbox.
Accordingly, the wiring of the Gazelle Business has also undergone changes (compared to the wiring diagram of the Gazelle with the 402 engine), since in the diesel version the following is installed:
- more powerful battery,
- new starter with improved characteristics;
- high performance generator;
Additional components
The Gazelle business wiring diagram has also undergone modification due to the appearance of:
- components and parts from ZF and Sachs in the clutch drive;
- power steering from ZF Lenksysteme;
- electrically heated exterior mirrors;
- a different front panel with a new instrument cluster;
- audio systems from Blaupunkt;
- updated cabin heater control unit.
In addition, cruise control of the Gazelle-Business family appeared as an option for the version with a power unit from Cummins, which also required changes to the electrical circuit of the car.
Conclusions: having subjected the Gazelle Business cars to modernization, the automaker has seriously improved the electrical wiring, for example, compared to the model with the 406 engine. That is why when replacing it or replacing its components, you should be guided by the manufacturer's electrical diagram.
Modern cars are equipped with heaters that maintain a set temperature in the cabin thanks to the presence of sensors and electric drives in their system. But the more complex the mechanism, the more of its elements can fail. Electronics are “afraid” of high humidity, sudden temperature changes and dust. And such factors are very difficult to avoid in a car. Therefore, some components or the entire mechanism as a whole may periodically fail.
Which radiator is better
When studying the design of the stove for passenger or cargo Gazelles, many owners wonder: which radiator copes better with its functions - aluminum or copper. Let's look at the main advantages of each of these options:
- Aluminum. It has an affordable cost, which can be 2 times lower compared to its copper counterpart. This is precisely the main reason why such products are distributed throughout the globe by manufacturers. Their main drawback is their lower thermal conductivity. The appearance of corroded areas can cause problems with the functioning of the entire heating and cooling system. They cannot be repaired - you have to throw them away and replace them with a new one.
- Copper. They have high thermal conductivity, and this directly affects the quality of interior heating. Copper is easy to solder, and therefore such radiators are repairable. The soldering is smoother and there are no oxides. The disadvantage is the higher selling price.
Experienced mechanics recommend installing a radiator made of copper after a major overhaul. Such a product will last longer, however, dirt particles can get into it, clogging the system. If there is no information about how dirty it is, then you can save money and install aluminum, which is simply washed during use.
Diagnostics
If the speed control unit fails, then you need to understand which of the elements of the entire circuit has failed. The control of the Gazelle stove is electronic, and all drives are electric.
- To begin with, with the engine turned off, we try to turn the temperature regulator. When you turn it, you should hear clicks from the gear motor. If there are no clicks, then you need to check the power in the block that comes to the tap opening motor. This can be done using a test lamp or a multimeter.
- If the fan speed controller does not work, you need to check its operation in all positions. If it does not work in all positions except the last one, then the reason is a faulty rheostat. If operation is not heard in any of the positions, then you need to check the power supply to the fan block. If power comes in, then it is broken.
- If the stove adjustment works correctly, but the display does not light up, then the display itself or the backlight is faulty.
Repair
Repair of the control unit will directly depend on the cause of the malfunction:
- If the power check shows that there is no “+” on the gear motor, then there is a malfunction in the heater control system. It needs to be dismantled and either repaired or replaced with a new one. For repairs, it is better to use the services of specialists, and if you have experience in this work, you can try to solve the problem yourself. To dismantle it is necessary: remove the top drawer for documents; unscrew the front panel (two screws on top and two on bottom); remove the decorative trim; pull out the entire panel so that all terminals can be numbered; disconnect the terminals; then take out the control element itself. Then reassemble everything in reverse order.
- To replace the resistor, you need to either remove the entire dashboard, or cut a hole under the box for documents, after first removing the box itself. To replace the fan, it is necessary to dismantle the entire instrument panel along with the stove. Then disconnect the stove from the dashboard, “halve” it and remove the resistor. If there is no power to the fan block, then the reason must be sought in the heater control system. To do this, you need to check it with a multimeter. Pinout of contacts of the Gazelle Business heater control unit:
- reserve;
- motor-gearbox (MR) feedback, heat-cold;
- access to the BRS;
- reserve;
- 5V, power supply for external temperature sensor;
- tap closing signal;
- tap opening signal;
- coolant heating sensor input;
- external temperature input;
- interior temperature sensor input;
- reserve;
- external temperature sensor housing;
- feedback, MR, glass - legs;
- MP heat – cold “+”;
- MP heat – cold “-”;
- MP recirculation “+”;
- MP recirculation “-”;
- MR glass – chest “+”;
- MR glass – chest “-”;
- MR glass – legs “+”;
- MR glass – legs “-”;
- feedback MR glass – legs 1;
- output of the heated glass and mirrors relay “+”;
- air conditioning relay output “-”;
- frame;
- feedback MR heat – cold 2;
- on-board network.
- To repair the display, you need to dismantle the entire heater adjustment element (as described in point No. 1) and repair or replace the entire assembly unit. If you repair it yourself, you can change the handle illumination diodes to a different color or change the brightness.
The stove is a very important element in a car. It affects not only the driver’s comfort, but also the safety of driving (since if the windows fog up in cold weather, driving becomes difficult). And it’s better to do all the work in a warm garage or parking lot than to do it on the road.
What to do if the stove on the Gazelle stops heating?
One of the most unpleasant winter breakdowns is the failure of the Gazelle’s standard heating system. All drivers diagnose this breakdown with the amazing ease inherent in the most experienced auto mechanics. This is understandable - it simply becomes a little cold in the cabin.
The cars of the Gorky Automobile Plant have always been famous for their maintainability, and modern Gazelles are no exception.
Let's see what we can do if such a misfortune happens to our car? First of all, we check the inlet and outlet pipes; most often they are the cause of failure, and the air heated by the engine blows into the engine compartment, instead of blowing into the cabin.
This problem can be solved simply by putting the pipes back on and tightening them with clamps. If the original clamp is lost, we go to the nearest construction supply store and buy a new one for 30 rubles.
If it's not too cold outside or if you're in a garage, you can try comparing the temperatures of the two pipes by touch. The output should be slightly colder than the input. If this is the case, let's try to blow out the heater radiator; to do this we will have to remove it. This is not difficult at all, since it is held on by only two bolts. If you remove the radiator from a recently shut down car and it is not hot, most likely this is the cause and you will have to buy a new one. Nowadays, it is most convenient to order spare parts from the GAZ online spare parts store, which works directly with the plant. This is both cheaper and faster than searching small shops for the availability of the required spare part. By the way, the radiator should be purged periodically and simply for preventive purposes.
If everything is fine with the radiator, let's check if the heating system hoses are damaged. If the car is already “aged”, it may be worth replacing them completely. Finally, if all the elements except the heater itself are diagnosed, then the reason is its failure.
The new heater can be found there - in the GAZ online spare parts store. We begin the procedure by draining the antifreeze. Then we unscrew the radiator and remove the pipes to clean the area where the radiator is located. Checking the radiator damper.
The only unpleasant moment that you may encounter when installing a new heater is a mismatch between the holes in the new heater and in the wall of the engine compartment. In this case, you may have to use a grinder and a drill to make new holes.
If the old pipes are sealed, we can put them on the new stove.
The main malfunctions that reduce the efficiency of the Gazelle stove:
- Lack of coolant in the cooling system, for example due to leaks;
- Thermostat malfunction, jamming;
- Airiness of the cooling system;
- Pump malfunction, in which coolant circulation in the system deteriorates or stops;
- Clogging, contamination of the air collector;
- Malfunction of the heater blower motor;
- Malfunction of the damper, damper lever (jamming in one position);
- Malfunction of the tap (checked by adjusting the temperature in the cabin, while checking the operation of the tap on the stove).
