Mercedes M-Class W163
since 1997 release
Repair and operation of the car
+ Mercedes-Benz cars of a class M (W163)
+ Governing bodies and methods of safe operation
+ Current leaving and service
- Cooling systems, heating and air conditioner
+ Engine cooling system
+ Systems of ventilation, heating and air conditioning
+ A power supply system and production of the fulfilled gases
+ Systems of electric equipment of the engine
+ Manual box of gear shifting
+ Automatic transmission
+ Transmission line
+ Brake and auxiliary systems
+ Suspension bracket and steering
+ Onboard electric equipment
Cooling systems, heating and air conditioner
Engine cooling system
All models of the cars considered in the present manual are equipped with the engine cooling system working with an excessive pressure with thermostatic management of circulation of working liquid. The water pump is fixed on the block of the engine and provides pumping of cooling liquid through a cooling path of the last. The stream of liquid washes regions of an arrangement of each of cylinders in the block then goes to a back part of the engine. The cooling channels laid in casting of the block and a head of cylinders provide intensive cooling of inlet and final ports, areas of installation of spark plugs and the directing plugs of final valves.
Since engine launch the cooling system passes through three modes of functioning: at the first stage until temperature of cooling liquid rose above a certain value, it circulates on a small circle from a working contour of which the radiator is excluded. In process of further warming up of liquid the dish-shaped valve of the voskozapolnenny thermostat entering the highway of system opens and the radiator is connected to a contour of circulation. Further, on reaching temperature of cooling liquid of the next control value, the thermosensitive sensor switch providing activation of the fan of the cooling system, forced which the additional air stream considerably increases efficiency of functioning of the heat exchanger of a radiator works.
The cooling system has a tight design and is densely closed by the cover of a radiator capable to maintain a certain excessive pressure that provides increase in a boiling point of cooling liquid and, respectively, efficiency of the heat sink through a radiator. At excess by internal pressure in system of some certain value, there is an overflowing of excess of cooling liquid on a connecting (overflow) tube in a broad tank. In process of cooling of system liquid automatically comes back from a tank to a radiator.
Gas station of cooling liquid in system is made through a mouth of a broad tank (see the Head of the Power supply system and production of the fulfilled gases) which at the same time acts also as the receiver accumulating in itself the excess of liquid which is forced out from a radiator.
In view of the listed features of a design, such cooling system received the name closed as in it any functional losses of working heat are excluded.
System of heating and ventilation
The system of heating consists of the fans and heat exchangers located in blocks of forward and back parts of salon. Hot cooling liquid passes through heat exchangers. When moving the handle of management of the modes of a heater located on the control panel valves open and hot air begins to come to interior of the car. If to turn on the heater fan, air will move in salon forcibly.
External air before getting to salon, is passed through special the filter, in the carburetor the main share of particles of dust settles. Replacement of the saloon filter has to be made on a regular basis according to the Schedule of routine maintenance of the car (see the Head of the Power supply system and production of the fulfilled gases). Violation of passability of the filter brings with decline in production of functioning of systems of heating/ventilation/air conditioning.
Distribution of streams of air of system of ventilation is carried out by means of gates. The possibility of switching of the modes of air circulation is provided. The drive of gates osushchestlvyatsya by means of servomotors.
Air conditioning system
See the Section General information and security measures.
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