Mercedes S-Class W-140
1991-1999 of release
Repair and operation of the car
+ Mercedes-Benz cars of the class S (W-140)
+ Operation manual
+ Routine maintenance
- Cooling systems, heating
+ Engine cooling system
- Systems of ventilation, heating and air conditioning
Casing of the fan and ventilatory assembly - installation details (on the example of petrol model with the engine of the M120.980/982 series)
The air conditioning system - additional information and precautionary measures
Arrangement of basic elements of the automatic air conditioning system
+ Power supply system and release
+ Engine electric equipment
+ Gear shifting box
+ Automatic transmission
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
Systems of ventilation, heating and air conditioning
The air given by system of ventilation to interior of the car via the filter can be warmed up or cooled depending on the choice of the driver and passengers. The heater or the conditioner settle down in salon, in the case under the dashboard. All stream of the air given to salon goes for heating or cooling through the same casing. Temperature and speed of a stream of air is regulated by means of the governing bodies located on the control panel.
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. Extent of heating is regulated by means of mixing in a certain ratio of cold and hot air by means of the mixing gate with the servo-driver.
Air conditioning system of salon
Functional schemes of the typical air conditioning system
Working path of a forward contour of the K/V system
Working path of a back contour of the K/V system
Works with air conditioning system have to be performed by a specialized workshop. Do not open at all a coolant circulation contour as at contact with skin coolant can cause a frostbite.
By means of air conditioning system air temperature in salon can go down below external temperature.
During the work of system humidity in salon decreases. During wet weather, the arriving fresh air previously it is cooled then again heats up to the set temperature. Thus its drainage is made. By means of this procedure fogging of glasses is removed.
Air conditioning system consists of the compressor, the condenser, a throttle, the evaporator, container with coolant and pipelines. In system coolant (R134a type) which depending on temperature and pressure can be in liquid or gaseous state circulates.
The conditioner compressor through a ridge belt is given to rotation from a bent shaft of the engine. He creates pressure to 30 bars in an installation cooling contour owing to what the coolant representing gas heats up. In the condenser coolant is cooled with the air proceeding outside (the cooling air remains in the external environment). Thereof the warmed coolant is condensed, turning into liquid. Having big pressure, it is passed through a throttle therefore its pressure falls. After that coolant evaporates in a contour, at the same time strongly being cooled. In the evaporator coolant selects heat from the air blown through it. Thereof air is cooled. The cooled air comes to interior of the car. As a result of heating in the evaporator coolant turns into gas and under low pressure comes to the compressor then process of circulation repeats.
Security measures at service of the air conditionerAir conditioning system has to be served by exclusively prepared 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.