Mercedes S-Class W-140

1991-1999 of release

Repair and operation of the car

Mercedes S-Class
+ Mercedes-Benz cars of the class S (W-140)
+ Operation manual
+ Routine maintenance
+ Engine
- Cooling systems, heating
   + Engine cooling system
   + Systems of ventilation, heating and air conditioning
+ Power supply system and release
+ Engine electric equipment
+ Gear shifting box
+ Automatic transmission
+ Coupling
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment



General parameters

Separate characteristics are provided also in the text of the Head and in case of obligation of their performance are highlighted in bold type.


Thermosiphon with the bladed water pump. Thermostatic adjustment. With a separate broad tank. The fan with the electric drive, joins and switched off by a two-level thermoswitch

Antifreeze type MB No. Q1 03 0002
Volume of system, l See the Head Routine maintenance

Composition of cooling liquid:

Antifreeze share in cooling liquid for ensuring frost resistance
to -37 °C of 50%  
to -45 °C of 55%  

Pressure in system About 1.2 bars (the exact size is specified on a cover of a broad tank). The cover has to maintain pressure within two minutes.


Valve stroke, mm
not less than 7

Temperatures of activation of the valve

Petrol engines
Beginning of opening
78-82 °
Full opening
94 °
Diesel engines
Data are not provided
Fan thermoswitch
Inclusion/switching off of the 1st step
92-97/84-91 °C
Inclusion/switching off of the 2nd step
99-105/91-98 °C

Air conditioner

Conditioner coolant

R134a (do not use R12)


With back To/in
on VIN A1 128373
with VIN A1 128374
Without back To/in
on VIN 1A 128373
with VIN 1A 128374

Refrigerator oil

Volume, cm3

Efforts of tightening of threaded connections, Nanometer

The moments of an inhaling of fixture are given also in the text of the Head and on some illyustratsiyakh*.

* The moments of an inhaling highlighted in the text in bold type are subject to exact observance; the efforts which are not highlighted in bold type are given only approximately