Heater and air conditioner
- 1 heater drive
- 2 fresh and ventilation air damper switch
The switch is rigidly connected to the heater drive and cannot be replaced separately.
- 3 leg area nozzle
- 4 rear heating duct
- 5 connector
- 6 leg area nozzle
- 7 heater cover
- 8 heat exchanger
- 9 upper air passage
- 10 additional fan resistor
- 11 Fresh/circulating air damper drive motor
- 12 fan
Warning: The switch is illuminated by a light cable, there is only one incandescent lamp. Remove the fan switch to replace the lamp. H m y remove from the cartridge with pliers. Since the middle of 1997, the release has been replaced by an LED (LED). The latter is not replaced.
Components of the heating, ventilation and air conditioning system located in the passenger compartment
- 1 side window nozzle
- 2 nozzles
- 3 glass defrost nozzle
- 4 hot and fresh air controls
- 5 spacer
- 6 instrument panel cross member
- 7 cabin air dust filter
- 8 electric motor. Fresh air/Vent damper
- 9 fresh air fan
- 10 additional resistor. With thermal fuse
- 11 heating device
- 12 central visor
- 13 nozzle for air supply to the leg area
- 14 front channel
- 15 seal
- 16 connector
- 17 heater drive rod
- 18 heat exchanger
- 19 joint seal heat exchanger/engine compartment bulkhead
- 20 spacer for glass defrost nozzles
Heater housing with elements of the interior heating and ventilation system
- 1 heat exchanger
After removal, the coolant must be completely replaced.
- 2 screws
Required when the locking tabs of the heat exchanger are broken.
- 3 air distributor casing. Should not be parsed.
- 4 fresh air/circulation damper motor
- 5 self-tapping screw
- 6 fresh air hood
- 7 fresh air cover
- 8 self-tapping screw
- 9 additional resistor. With overheat protection.
- 10 self-tapping screw
- 11 central damper lever
- 12 temperature damper lever
- 13 base
- 14 heat exchanger seal/engine compartment bulkhead
The seal has a mark on the end face. The seal must be installed so that the meta coincides with the H mark on the base
Cabin Air Conditioning Diagram
- 1 compressor
- 2 compressor speed sensor
- 3 electromagnetic clutch
- 4 oil removal plug
- 5 safety valve
- 6 connector with valve
- 7 high pressure switch. For air conditioner and electromagnetic clutch
- 8 cover. With a seal, must be fixed.
- 9 service connection. At the condenser.
- 10 capacitor
- 11 threaded connection in the coolant pipe
- 12 throttle. Built into connection -11-.
- 13 evaporator
- 14 low pressure / coolant circuit switch
- 15 connecting piece with valve
- 16 collection container
- HD high pressure side
- ND low pressure side
The scheme of placement in the engine compartment of the components of heating and air conditioning systems
- 1 dust filter
- 2 fairing cover
- 3 evaporator drain valve
- 4 heater heat exchanger connectors
- 5 damper for switching air supply modes (fresh air/closed circulation) (N63)
- 6 cooling fan operation control (J293)
- 7 vacuum reservoir
- 8 vacuum hose
- 9 air conditioner temperature sensitive switch
- 10 capacitor
- 11 pressure reducing valve
- 12 Air conditioner clutch (N25)
- 13 ambient temperature sensor-switch (F38)
- 14 pressure switch in the air conditioning system (F129)
- 15 receiver dryer
- 16 viewing window
- 17 low and high pressure service valves
- 18 expansion valve
General information and security measures
The air supplied by the ventilation system to the passenger compartment through the filter can be heated or cooled, depending on the choice of the driver and passengers. The heater or air conditioner is located in the passenger compartment in the housing under the instrument panel. The entire flow of air supplied to the passenger compartment is directed for heating or cooling through the same casing. The temperature and air flow rate are regulated by means of the controls located on the control panel.
The heat generated during engine operation is transferred by the coolant to the heater radiator located in the passenger compartment. The intake airflow from the ventilation system passes through the radiator and is heated by the heat of the engine coolant flowing inside the radiator. The degree of heating is regulated by mixing in a certain ratio of cold and hot air using a mixing damper.
The air conditioner in cooling mode removes excess heat and moisture from the passenger compartment in accordance with basic physical principles. FCKW free refrigerant (R 134 a), and does not harm the environment, circulates as a liquid in that part of the system where high pressure is maintained, evaporates and turns into a gas in the low pressure section. When the gas expands, cooling occurs, accompanied by the removal of heat from the air supplied by the fan to the passenger compartment and a decrease in its temperature. Further, as it passes through the condenser, the refrigerant gives off the absorbed heat to the surrounding air. The heat extraction cycle continues indefinitely as the refrigerant circulates in a closed circuit. From the air supplied to the passenger compartment, moisture is removed due to condensation on the evaporator of the refrigerator compartment.
The air conditioner automatically maintains the set value of the interior temperature constant.
The Climatronic air conditioning system, unlike a conventional air conditioner, automatically regulates the amount and distribution of air in addition to the temperature. The air quantity is controlled steplessly by changing the fan speed depending on the temperature difference between the set temperature and the interior temperature.
The Climatronic has an additional solar sensor that detects solar radiation. It is located in the center of the instrument panel under the windshield. In the case of particularly high solar radiation, the solar sensor automatically influences, via the electronic control system, the fan speed and thus the amount of air supplied to the passenger compartment. The set temperature in the passenger compartment is corrected according to the solar radiation.
The compressor is driven by an electric motor.
The electronic control unit is built into the air conditioner control unit. If the fan speed is manually set below the minimum, the heating/air conditioning system is switched off.
Malfunctions that have occurred in the control device or sensors and executive bodies are recorded in the fault memory of the control device. A special device is used to read fault codes.
The air conditioning system is a potential hazard. Its maintenance requires compliance with certain rules. Most air conditioning repairs and maintenance require specialized equipment and skills.
Body ventilation is provided by the formation of a through air flow. Fresh air enters the car through an air intake located in front of the windshield. The air flow exits through the exhaust channels located under the rear bumper.
The amount of air flow is controlled by a four-speed fan.
The mixing type air heating system is designed to quickly respond to changes in the air temperature in the cabin and reduce the temperature pulsation of the heated air. The coolant of the engine cooling system constantly circulates in the heater core and the coolant flow is not regulated. The controlled factor is the air temperature, which is changed by the mixing damper, which determines the amount of air passing through the heater radiator before it enters the car interior.
To prevent outside air from entering the car interior, there is an air circulation mode.
Air Conditioner Maintenance Safety Precautions
The air conditioning system must only be serviced by trained technicians who are trained in safe work practices using the proper equipment, following depressurization procedures, and who are familiar with the collection and storage of automotive refrigerant.
Avoid skin contact with refrigerant.
Wear protective goggles when working near the air conditioning system.
If refrigerant comes into contact with skin or eyes, do not rub the affected area. Rinse immediately with cold water for at least 15 minutes. Contact a doctor or health facility immediately. Self-medication is not allowed.
In a new cylinder, the refrigerant is stored under pressure. Store the cylinder at a temperature not exceeding 50°C. Take care not to drop the cylinder from a height or otherwise cause damage to the cylinder.
Work should be carried out in a well-ventilated area. The refrigerant evaporates quickly, resulting in reduced oxygen supply and difficulty breathing.
The gaseous refrigerant is heavier than air and must collect relatively quickly at the bottom, such as under a car.
When the refrigerant burns, poisonous gas is produced. Keep refrigerant away from open flames. Do not smoke. When using a flame leak detector, avoid breathing smoke.
When carrying out welding work near the air conditioning system, exposure to high temperature or an open flame. Overheating can cause system pressure to rise and ignite.
Cleaning the condenser or evaporator with steam is not permitted. Use only cold water or compressed air.
A 4-stage fresh air fan is used to increase air exchange. In order for the fan to operate at different speeds at different stages, resistors are switched on. The resistors are located in the connection plate on the fan. If there are faults, the connection board is replaced as a set.
If fresh air is not to be sucked in, for example if the outside air is poor, pressing the recirculation ventilation key switches to air circulation. In this case, the air circulates only inside the cabin. The switch moves the damper by acting on a small electric motor.
Warning: If enabled «Windscreen defrost mode», i.e. the air distributor switch is set to the end position at the top, recirculation mode is not possible.
Warning: The A3 may also be equipped with air conditioning.
Warning: Air conditioner repair is not covered here. These works must be carried out in a specialized workshop.
Warning: Do not open the refrigerant circuit of the air conditioner, as contact with the skin may cause frostbite.
Warning: In case of accidental skin contact, immediately flush the affected area with cold water for at least 15 minutes. Coolant is colorless, odorless and heavier than air. If coolant leaks, there is a risk of poisoning in the underbody or underside of the vehicle (the presence of liquid is not felt).
Warning: In case of accidental skin contact, immediately flush the affected area with cold water for at least 15 minutes. Coolant is colorless, odorless and heavier than air. If coolant leaks, there is a risk of poisoning in the underbody or underside of the vehicle (the presence of liquid is not felt).
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