VW Passat B5

since 1996 release

Repair and operation of the car

Foltsvagen Passat B5
+ Maintenance instruction
+ 1. Maintenance
+ 2. Engines
+ 3. Cooling system
+ 4. Fuel system
+ 5. Engine management
+ 6. Exhaust system
+ 7. Transmission
+ 8. Running gear
+ 9. Steering
+ 10. Brake system
+ 11. Body
- 12. Heating, ventilation
   12.2. Ventilating nozzles
   12.3. Control panel of a heater
   12.4. Lever of the central gate
   12.5. Control unit of a heater
   12.6. Block of resistors of a heater
   12.7. Control unit of a heater and conditioner
   12.8. Conditioner compressor
   12.9. Heater fan
+ 13. Electric equipment

12. Heating, ventilation

12.1. General information


Details of system of heating and ventilation

1 – bracket,
2 – pollen filter,
3 – case,
4 – nozzles of an obduv of a windshield,
5 – nozzles of an obduv of side glasses,
6 – forward nozzles,
7 – cross arm,
8 – adapter,
9 – heater block,
10 – heater fan,
11 – adapter,
12 – decorative overlay of the control panel of a heater,
13 – control panel of a heater,
14 – block of regulators of a heater,
15 – ropes,
16 – heater radiator,
16 – left lower air channel,
18 – connector,
19 – top air channel,
20 – air stream distributor

The air given by system of ventilation to interior of the car can be warmed up or cooled depending on the conditions of comfort chosen by the driver and passengers. Systems of heating and a konditsiona of a rovaniye are separate, however units and knots of these systems settle down in a passenger compartment in the general case under the dashboard. All stream is given го to salon of air goes for heating or cooling through the same casing. Temperature and speed of a stream of air is regulated by means of the same governing bodies.

Heat generated during the operation of the engine is transferred by cooling liquid to the heater radiator located in salon. The brought air stream from system of ventilation passes through a radiator and heats up heat of the cooling liquid of the engine proceeding in a radiator.

Air conditioning system deletes excessive heat and moisture from salon according to the basic physical principles. The coolant circulating in the form of liquid in that part of system where high pressure is supported evaporates and turns into gas on the site of low pressure. At expansion of gas there is a cooling which is followed by selection of heat from the air given by the fan to passenger salon and decrease in its temperature. Further in process of passing via the condenser coolant gives the absorbed heat to air. The cycle of selection of heat continues ся infinitely long in process of circulation of coolant on the closed contour. From the air given to salon there is a removal of moisture owing to condensation on the refrigerator evaporator.

The air conditioning system represents potential danger. At its service observance of certain rules is required. Performance of the majority of operations on repair and service of system of a konditsiona of a rovaniye requires the special equipment and certain skills of work.

Ventilation of a body is provided by formation of a through stream of air. Fresh air gets in the car through an air inlet, is located ny before a windshield. The stream of air comes to light via the final channels located on each side bodies about back shock-absorbers.

The size of a stream of air is regulated by the 4-speed fan.

The system of heating of air of the mixed type is intended for quick response to change of air temperature in salon and reduction of a pulsation of temperature of the warmed-up air. Cooling liquid of the cooling system of the engine constantly circulates in a radiator of a heater and the stream of cooling liquid is not regulated. An adjustable factor is the air temperature which changes the mixing gate defining amount of air, prokhodyashche го through a heater radiator before its hit in interior of the car.

For a hit exception in interior of the car of fresh air there is an air recirculation mode.

Precautionary measures at service of the air conditioning system

Air conditioning system refuels R12 Freon coolant, and details of system are under the working pressure over 300 atmospheres. A source of the increased danger at improper maintenance of system by unprepared technicians and when using not of the appropriate equipment is the high pressure and chemical influence of coolant.

Automobile coolant "R12 Freon" possesses dangerous impact on the environment. For environment protection Volkswagen orders to use the equipment on utilization and processing supplied with the certificate of insurance laboratory (UL) at depressurization of air conditioning system.

Air conditioning system has to be served is exclusively prepared by the ny technicians trained in safe working methods with use of the appropriate equipment with observance of rules of depressurization, acquainted with methods of collecting and order of storage of automobile coolant.

Do not allow coolant contact by skin.

During the work near air conditioning system put on goggles.

At hit of coolant on skin or eyes do not pound the struck place. Immediately wash out cold water within not less than 15 minutes. Immediately see a doctor or in medical institution. Self-treatment is not allowed.

Coolant is stored in a new cylinder under pressure. You store a cylinder at a temperature not above 50 °C. Take the measures excluding falling of a cylinder about heights or other situations which can lead to its damage.

Works should be carried out in well aired room. Coolant quickly evaporates, leads to reduction of access of oxygen and the complicated breath.

Gaseous coolant is heavier than air and rather quickly has to gather below, for example, under the car.

At combustion of coolant poisonous gas is formed. You store coolant far from open sources of fire. You do not smoke. When using an ardent techeiskatel avoid smoke inhalation.

When carrying out welding works near the air conditioning system always delete from it coolant. Electric welding near pipelines with coolant can cause decomposition of coolant under the influence of ultra-violet radiation.

Do not subject air conditioning system detail to influence of high temperature or an open flame. The overheat can lead to increase in pressure in system and to ignition.

Cleaning of the condenser or evaporator by means of water vapor is not allowed. It is necessary to use only cold water or compressed air.