Heating and ventilation system parts
- 1 - bracket,
- 2 - pollen filter,
- 3 - body,
- 4 - windshield blower nozzles,
- 5 - side window blower nozzles,
- 6 - front nozzles,
- 7 - cross bracket,
- 8 - adapter,
- 9 - heater unit,
- 10 - heater fan,
- 11 - adapter,
- 12 - decorative trim for the heater control panel,
- 13 - heater control panel,
- 14 - heater control unit,
- 15 - cables,
- 16 - heater radiator,
- 16 - left lower air duct,
- 18 - connector,
- 19 - upper air duct,
- 20 - Air flow distributor
The air supplied by the ventilation system to the car interior can be heated or cooled depending on the comfort conditions selected by the driver and passengers. The heating and air conditioning systems are separate, but the units and components of these systems are located in the passenger compartment in a common housing under the instrument panel. The entire flow of air supplied to the interior is directed for heating or cooling through the same casing. The temperature and speed of the air flow are regulated using the same controls.
The heat generated by the engine is transferred by the coolant to the heater radiator located in the passenger compartment. The air flow supplied by the ventilation system passes through the radiator and is heated by the heat of the engine coolant flowing inside the radiator.
The air conditioning system removes excess heat and moisture from the passenger compartment in accordance with basic physical principles. The refrigerant, circulating as a liquid in the high-pressure section of the system, evaporates and turns into a gas in the low-pressure section. As 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. Then, as it passes through the condenser, the refrigerant gives off the absorbed heat to the surrounding air. The heat removal cycle continues indefinitely as the refrigerant circulates in a closed circuit. Moisture is removed from the air supplied to the passenger compartment due to condensation on the evaporator of the refrigeration chamber.
The air conditioning system is a potential hazard. When servicing it, certain rules must be followed. Most repair and maintenance operations on the air conditioning system require special equipment and certain skills.
The body is ventilated by forming a through air flow. Fresh air enters the car through the air intake located in front of the windshield. The air flow exits through the exhaust channels located on the sides of the body near the rear shock absorbers.
The air flow rate is regulated by a four-speed fan.
The mixed air heating system is designed to quickly respond to changes in the air temperature in the passenger compartment and reduce the pulsation of the heated air temperature. The engine cooling system coolant constantly circulates in the heater radiator and the coolant flow is not regulated. The regulated factor is the air temperature, which is changed by the mixing valve, which determines the amount of air passing through the heater radiator before it enters the car's passenger compartment.
To prevent fresh air from entering the car interior, there is an air recirculation mode.
[The article is posted on this website: VWMANUAL]
Precautions for servicing the air conditioning system
The air conditioning system is filled with the refrigerant "Freon R12", and the system parts are under operating pressure of over 300 atmospheres. The source of increased danger in case of improper maintenance of the system by untrained technical personnel and when using improper equipment is the high pressure and chemical effect of the refrigerant.
Automotive refrigerant "Freon R12" has a dangerous impact on the environment. In order to protect the environment, Volkswagen prescribes the use of disposal and recycling equipment equipped with an Insurance laboratory (UL) certificate when depressurizing the air conditioning system.
The air conditioning system must be serviced only by trained technical personnel who are trained in safe operating practices using the proper equipment, observing depressurization rules, and are familiar with the methods of collecting and storing automotive refrigerant.
Avoid contact of refrigerant with skin.
Wear safety glasses when working near the air conditioning system.
If refrigerant gets on your skin or eyes, do not rub the affected area. Rinse immediately with cold water for at least 15 minutes. Seek immediate medical attention or medical attention. Self-medication is not allowed.
The refrigerant in a new cylinder is stored under pressure. Store the cylinder at a temperature not exceeding 50°C. Take measures to prevent the cylinder from falling from a height or other situations that may cause damage to it.
Work should be carried out in a well-ventilated area. The refrigerant evaporates quickly, reducing oxygen supply and making breathing difficult.
The gaseous refrigerant is heavier than air and should collect relatively quickly at a low level, such as under a car.
When refrigerant burns, toxic gas is produced. Keep refrigerant away from open flames. Do not smoke. Avoid inhaling smoke when using a flame leak detector.
When welding near the air conditioning system, always remove the refrigerant from it. Electric welding near refrigerant pipes may cause the refrigerant to decompose under the influence of ultraviolet radiation.
Do not expose air conditioning system parts to high temperatures or open flames. Overheating may cause pressure in the system to increase and cause a fire.
Cleaning the condenser or evaporator with water vapor is not permitted. Only cold water or compressed air should be used.
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