Mercedes S-Class W-140

1991-1999 of release

Repair and car operation



Mercedes S-Class
+ Mercedes-Benz Cars of a class S (W-140)
+ Operation manual
+ Routine maintenance
+ Engine
- Systems of cooling, heating
   Specifications
   + System of cooling of the engine
   - Systems of ventilation, heating and air conditioning
      Casing of the fan and ventilyatorny assembly - installation details (on an example of petrol model with the M120.980/982 series engine)
      Air central air - additional information and precautionary measures
      Arrangement of basic elements of automatic central air of air
+ Power supply system and release
+ engine Electric equipment
+ gear shifting Box
+ Avtomaticheckaya transmission
+ Coupling
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment



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Air central air - additional information and precautionary measures

General information

Central air of air consists of the condenser located before a radiator of system of cooling, the evaporator close to the heat exchanger of a heater, the compressor given by a driving belt, a receiver/dehumidifier, and also the various tubes connecting components listed above. On an entrance of the evaporator the zaslonka providing pressure difference, necessary for system work is established.

The fan submits warm air from salon to the evaporator (analog of a radiator) where heat of air is transferred to a coolant. Thus the coolant evaporates and leaves the evaporator.

Scheme of a working contour of the forward automatic conditioner of air

1 — the Vacuum receiver
35 — the Divider
36 — Vacuum klapanny assembly
37 — the Vacuum element of the servo-driver of a zaslonka of an air line of the left nozzle обдува flew down
38 — the Vacuum element of the servo-driver of a zaslonka of an air line of the left nozzle обдува flew down
41 — the Vacuum element of the servo-driver of a rejecting zaslonka of an air line of the central nozzle
44 — the Vacuum element of the servo-driver of the main air zaslonka
45 — the Vacuum element of the servo-driver of a mixing zaslonka of an air line of the left central nozzle
46 — the Vacuum element of the servo-driver of a mixing zaslonka of an air line of the right central nozzle
47 — the Vacuum element of the servo-driver of a zaslonka of the left foot air line
48 — the Vacuum element of the servo-driver of a zaslonka of the right foot air line
49 — the Vacuum element of the servo-driver of a zaslonka of switching of modes of circulation
Y11 — Klapanny the block

bl — dark blue
dgn — dark green
drt — dark red
hbl — blue
ge — yellow
gr — gray
mgn — green
rt — red
orange — oranzheny
sw — black
ws — white

Scheme of a working contour of the back automatic conditioner of air

1 — the Vacuum receiver
36 — Vacuum klapanny assembly
50 — the Vacuum element of the right back foot well
51 — the Vacuum element of the left back foot well
Y67/1 — the Vacuum valve of the servo-driver of a zaslonka of a back air line

bl — dark blue
dgn — dark green
drt — dark red
hbl — blue
ge — yellow
gr — gray
mgn — green
rt — red
orange — oranzheny
sw — black
ws — white

On the models equipped with system of automatic air conditioning all distributive zaslonka have a vacuum drive. Depression from a receiver (30) and vacuum klapanny assembly moves in the klapanny block (Y11) which provides its giving on a drive corresponding a zaslonok (37 ÷ 49) according to the installations chosen from a control panel To/in (see also Comfort of Head the Operation manual).

Precautionary measures

The system is under pressure! Do not try to disconnect any tubes concerning central air of air, previously without having removed from it working liquid.

Liquid removal from system - rather difficult operation which should be carried out at service station.

In system there is a R134a type coolant. Be convinced that at station there is necessary for this purpose such as a coolant an equipment.

Use goggles, disconnecting system tubes.

If on your car air central air is established, at carrying out service of its any component observe the following precautionary measures:

  • The coolant of R134a which is using now, is much less aggressive, than a coolant of the R12 type used earlier. Nevertheless, it is very hazardous to health. Do not allow its hit in eyes or on skin - you can burn. Though it also is not toxic, its pairs can cause asthma - do not delete it from system, being indoors. Its pair it is heavier some air therefore are not under the car at its removal from system;
  • Do not allow contact паров a coolant with open fire. At its combustion poisonous gas is allocated. The gas mixed with air in a certain proportion, can become explosive. Steam inhalation through the lit cigaret can lead to tragic consequences;
  • Do not allow coolant hit in the atmosphere. Unlike R12 the coolant of the R134а type does not cause destruction of an ozone layer, but leads to emergence of greenhouse effect in the atmosphere;
  • In system the consolidations made of a special material, intended for work with the set type of a coolant (for 134а - green color) are used. Casually not to mix various types of coolants, for filling of a certain type of a coolant adapters are used a certain type;
  • The discharge of system should be carried out on HUNDRED Mercedes-Benzs;
  • Before carrying out any works connected with heating of any knots of the car (welding, the soldering, drying after painting), discharge system. To discharge system it is also necessary before carrying out service any of knots of central air of air.