Mercedes S-Class W-140

In 1991-1999 editions

Repair and enterprise of the car

Mercedes S-Class
+ Mercedes Benz cars of the class S (W-140)
+ operation manual
+ Routine maintenance
+ Motor
- Cooling systems, heating
   Specifications
   + motor cooling system
   - Systems of ventilation, heating and air conditioning
      Coat of the fan and wentiljatornaja installation - a device detail (on the example of petrol model by means of the motor 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
+ systems of power supply and edition
+ electric equipment of the motor
+ gear shifting boxes
+ Awtomatitscheckaja transmission
+ connection
+ brake system
+ Aufhängung and management
+ body
+ electric onboard equipment

Systems of ventilation, heating and air conditioning

Watch the operation manual extended also comfort of the head

Air which is served as system of ventilation in a car interior by means of the filter can or be cooled depending on the choice of the driver and passengers are warmed up. The heater or the conditioner are in salon, in a body under the panel of devices. All current of the air which served in salon goes for heating or cooling with the same coat. Temperature and speed of current of air is regulated by means of administrative bodies is located on the control panel.

Scheme of the cooling system


1 — the Expanding container 2 — a cover 3 — silikogelewyj of containers Is established 4 — Einlassstutzen 5 — the heater 6 — the thermostat 7 — the listener of ventilation 8 — motor current to the heater 9 — heater current to the motor 10 — the cooling system pump	11 — the Fat heater 12 — the block of cylinders 13 — the head of the block of cylinders 14 — the Aggravating heater pipeline 15 — stekloomywatelej heater 16 — the heater heater 17 — the gate of double pulsing 18 — the address pump 19 — the Coming-back listener of the heater

Warmly, who gets out in operating time of the motor, will transfer from the cooled liquid to the heater of the heater which is located in salon. The brought current of air of system of ventilation goes the heater and will be from heat of the cooled motor liquid, it within the heater passes is heated. The step of heating is regulated by means of mixing in a certain relation of cold and hot air by means of smessitelnoj saslonki with Servoantrieb.

The used air is removed from salon opening of ventilation with the return gates.

Increase in costs of Wärmeübertrager air guarantees the fan of fresh air.

If it is necessary to switch off transfer of fresh air, for example, at a bad smell, the system switches in the mode of the address at which the available air circulates in salon only there.

Switching of system in the mode of the address is confirmed by activization of a control lamp (watch chapter the operation manual).

Air conditioning system of salon

Functionally schemes of the typical air conditioning system

Working path forward contour of the K/W system


And — entrance discovery of the cooled liquid In — the return stream of the cooled liquid 1 — the motor 2 — the prokatschki block of heating of salon	3 — Wärmeübertrager of the heater of salon 6 — the heater of heating of a windshield (screen wiper) 7 — the thermo-gate, heating of a windshield (screen wiper) 8 — the thermo-gate, the liquid electric heater for washing of a windshield

Working path back contour of the K/W system


And — an input of the cooled liquid In — the return stream of the cooled liquid 1 — the motor 2 — the prokatschki block of heating of salon 3 — Wärmeübertrager, system of heating	4 — the prokatschki block, the conditioner of the thinking-out salon 5 — Wärmeübertrager of the heater, the conditioner of the thinking-out salon 6 — the heater of heating of a windshield (screen wiper) 7 — the thermo-gate, heating of a windshield (screen wiper) 8 — the thermo-gate, the liquid electric heater for washing of a windshield

Works with the Konditionierung system have to be filled with the allocated workshop. You do not open at all a contour of the address of coolant as at contact with skin obmoroschenije coolant can cause.

By means of the Konditionierung system air temperature can decrease in salon below than external temperature.

In operating time of system humidity is reduced in salon. In damp weather, the operating fresh air meanwhile it is cooled then up to due temperature it is again heated. Thus its drainage is made. By means of this procedure sapotewanije of glasses is removed.

The Konditionierung system exists from the compressor, the condenser, a thrush, Verdampfers, power with coolant and pipelines. In system coolant (R134a type) which can be depending on temperature and pressure in freely or gas state circulates.

The conditioner compressor is given by a ridge belt to turns of a bent shaft of the motor. He creates pressure to 30 bars in a contour of cooling of the device owing to whose coolant which represents gas is heated. In the condenser coolant of the air passing outside (the cooled air is cooled remains in the external vicinity). Owing to its warmed-up coolant it is condensed, to itself turning into liquid. Big pressure having, it is passed by a thrush as the result of which falls pressure. Then coolant evaporates in a contour, is at the same time strongly cooled. Coolant admits heat from produwajemogo to Verdampfer thanks to it at air. Owing to its air it is cooled. The cooled air works in a car interior. Owing to heating in Verdampfer coolant turns into gas and under low pressure works in the compressor then process of the address repeats.

Precautionary measures at service of the air conditioner

The Konditionierung system has to be served by exclusively prepared technicians which are diplomaed to sure production methods when using of the belonging equipment following rules of the decompression entered with pictures of duty and an order of preservation of autocoolant.

Do not allow contact of coolant with skin;

In operating time along with the Konditionierung system you put on goggles;

During the coolant meeting on skin or eyes you do not pound the met place. At once you erase from cold water during it many 15 minutes. At once see a doctor or in medical institution. Self-healing is not allowed;

In a new cylinder coolant remains under pressure. They do not keep a cylinder at a temperature above 50 °C. If actions seize you which exclude cylinder ambushes from height or other situations which can lead to its damage;

It is necessary works with it well aired the room to carry out. Coolant quickly evaporates, leads to reduction of access of oxygen and the complicated breath;

Gaseous coolant is heavier as air and rather quickly has to gather below, for example, under car;

At combustion of coolant poisonous gas is formed. They keep coolant far from open sources of fire. They do not smoke. When using igniting tetscheiskatelem you avoid smoke inhalation;

At work of sweat near the Konditionierung system of influence of high temperature or naked flame. The overheat can lead to increase in pressure in system and ignition;

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