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



The air conditioning system - additional information and precautionary measures

General instructions

The air conditioning system exists from the condenser which is located in front of the heater of the cooling system, Verdampfers which is located along with Wärmeübertrager of the heater, the compressor which is given by priwodnym a belt, ressiwera/dryer, and also various listeners who connect above-mentioned components. On Verdampfers saslonka entrance, guaranteeing pressure bias which is necessary for work of system defines.

The fan gives warm air from salon to Verdampfer (a heater analog) where heat will transfer to air to coolant. At the same time coolant evaporates and appears from Verdampfer.

Scheme working contour of the automatic forward conditioner of air

1 — ressiwer Vacuum
35 — a divider
36 — installation of valves of vacuum
37 — an element of Servoantriebes saslonki vacuum of the air channel the left sopla obduwa of glaziers
38 — an element of Servoantriebes saslonki vacuum of the air channel the left sopla obduwa of glaziers
41 — a Servoantriebes vacuum element spitefully saslonki of the air channel is central sopla
44 — a Servoantriebes vacuum element significantly vozdushno saslonki
45 — an element of Servoantriebes smessitelnoj saslonki vacuum of the air channel left sopla is central
46 — an element of Servoantriebes smessitelnoj saslonki vacuum of the air channel sopla is really central
47 — an element of Servoantriebes saslonki vacuum the left noschnogo of the air channel
48 — an element of Servoantriebes saslonki vacuum noschnogo of the air channel is valid
49 — an element of Servoantriebes saslonki vacuum of switching of the modes of the address
Y11 — the Block of valves

bl — blue color
dgn — dark green
drt — dark red
hbl — blue color
— it is yellow
gr — it is gray
mgn — green
rt — red color
оранжево — oranschenyj
sw — in black color
ws — a whiteness

Scheme working contour of the back automatic conditioner of air

1 — ressiwer Vacuum
36 — installation of valves of vacuum
50 — a vacuum element really for source noschnogo
51 — a vacuum element left for source noschnogo
Y67/1 — the gate of Servoantriebes saslonki vacuum of the back air channel

bl — blue color
dgn — dark green
drt — dark red
hbl — blue color
— it is yellow
gr — it is gray
mgn — green
rt — red color
оранжево — oranschenyj
sw — in black color
ws — a whiteness

On models, equipped with system of automatic air conditioning have all distribution of saslonki a vacuum incentive. Dilution from ressiwera (30) and installation of valves of vacuum is served in the block of valves (Y11) which guarantees its transfer on an incentive as appropriate of saslonok (37 ÷ 49) according to devices which are chosen a tax board of K/W (also the operation manual watch comfort of the head).

Precautionary measures

The system is under pressure! Do not try to exclude some listeners who have a relation on the air conditioning system, meanwhile from it working liquid not remotely.

Removal of liquid from system - rather difficult operation which has to be filled in the station of service.

Coolant is in system as R134a. Are convinced that there is an equipment in the station it is necessary for this purpose as coolant.

Use goggles, listeners of system excepting.

If on your car the air conditioning system is defined, pay attention when carrying out service of its some component to the following precautionary measures:

  • R134a coolant which are used is less aggressive now significantly, than the coolant earlier used than R12. Despite it, it is very hazardous to health. Do not allow a meeting on the person or on skin - you can get burn. Though it is not poisonous, its couples can cause a suffocation - you do not leave it from system, indoors including. It is heavier than its couple as air therefore you are not under car during its removal from system;
  • Do not allow contact of parow of coolant with naked flame. At its combustion poisonous gas takes itself. Gas which is mixed with air in a certain proportion can become взрывчат. Inhalation of parow the lit cigarette can lead to tragic consequences;
  • Do not allow a coolant meeting in the atmosphere. Unlike R12 coolant as R134a does not cause destruction of an ozone layer, but leads to emergence of greenhouse effect in the atmosphere;
  • In system there will be a condensation which is made from special material, intends for work with the set coolant type (for 134a - green color) uses. Not to mix various types of coolants incidentally, adapters are used for gas station of the defined type of coolant of a certain type;
  • The discharge of system needs to be filled it is necessary on 100 Mercedes Benz;
  • Before carrying out any works which are connected with heating of some knots of the car (welding, soldering, Dörrkringel after pokraski) you unload system. System also unload knot of the air conditioning system has to go before carrying out service some.