Mercedes-Benz G-class (W463) since 1999 of release
1. Introduction
2. Governing bodies and operation receptions
3. Current leaving and service
4. Engine
5. Systems of cooling, heating, ventilation and air conditioning
5.1. System of cooling of the engine
5.2. Systems of ventilation, heating and air conditioning
6. A power supply system and production of the fulfilled gases
7. Systems of electric equipment of the engine
8. Automatic transmission
9. Transmission line
10. Brake and auxiliary systems
11. Suspension bracket and steering
12. Body
13. Onboard electric equipment
14. Schemes of electric connections


 







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5. Systems of cooling, heating, ventilation and air conditioning

General information

System of cooling of the engine

All models of cars considered in the real Management are equipped with system of cooling of the engine working at superfluous 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 an okhladitelny 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. Laid in molding of the block and a head of cylinders okhladitelny channels provide intensive cooling of inlet and final ports, areas of installation of spark plugs and directing plugs of final valves.

From the moment of engine start the system of cooling passes through three modes of functioning: at the first stage while the temperature of cooling liquid did not rise above a certain value, it circulates on a small circle from which working contour the radiator is excluded. In process of further warming up of liquid the tarelchaty valve included in a path of system of the voskozapolnenny thermostat opens and the radiator is connected to a contour of circulation. Further, on reaching temperature of cooling liquid of the next control value, works the thermosensitive sensor switch providing activation of the fan of system of cooling, forced which the additional air stream considerably increases efficiency of functioning of the heat exchanger of a radiator.

The system of cooling has a tight design and is densely closed by a radiator cover / the broad tank, capable to maintain a certain superfluous pressure that provides increase of a boiling point of cooling liquid and, respectively, efficiency of a heat-conducting path 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 (perelivny) tube in a broad tank. In process of system cooling liquid automatically comes back from a tank to a radiator.

Filling of cooling liquid in system is made through a mouth of a broad tank (see. Head the Current leaving and service) which at the same time acts also as a receiver accumulating in forced out from a radiator excess of liquid.

In view of the listed features of a design, such system of cooling received the name closed as in it any functional losses of a working body are excluded.

On some petrol models, and also on diesel models with the M612 engine the preliminary electroheater providing the accelerated warming up of the engine in cold weather is built in a contour of a water path of system of cooling. A food on a heater can move from power supply network 230 or 115 V.Moshchnost's tension of consumption of a heating element makes 500 W.

The electroheater can be established on the corresponding models in an individual order as an element of an additional complete set.

Heating and ventilation system

The system of heating consists of fans and the 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 by modes of the heater, located on the control panel (for more details see. A part of the Device of ensuring comfort), open valves and hot air starts to arrive in car salon. If to turn on the heater fan, air will move in salon compulsorily.

External air before getting to salon, is passed via the special filter in which the main share of particles of a dust settles. Replacement of the salonny filter should be made on a regular basis according to the Schedule of routine maintenance of the car (see. Head Current leaving and service). Violation of passableness of the filter brings with decline of productivity of functioning of systems of heating/ventilation/air conditioning.

Distribution of streams of air of system of ventilation is carried out with the help a zaslonok. Possibility of switching of modes of air circulation is provided. The drive a zaslonok is carried out by means of servomotors.

Air central air

See. Section General information and security measures.

Specifications

Cooling system

General parameters

Type of system of cooling Closed, with the water pump, the thermostat, a radiator, the fan (electric or with the vyazkostny coupling of coupling) and separately established broad tank
Volume of cooling liquid See. Specifications
Composition of cooling liquid (a share of antifreeze in cooling liquid for ensuring frost resistance)
  • to - 37°С
50 %
  • to - 45°С
55 %
Working pressure in system, atm 1.4

Thermostat

Petrol models

Valve stroke, mm not less than 8
Temperatures of activation of the valve, °C
  • Opening beginning
85 ÷ 89
  • Complete opening
102

Diesel models

Data are absent

Cover of a path of system of cooling

Pressure of operation of the safety valve built in in a cover, atm
  1. Cover code 140
  • The new
1.4 + 1
  • Being in the use
1.4-1
  1. Cover code 140/200
  • The first stage (temperature of cooling liquid 130/134°C)
1.4 ± 1
  • The second stage (temperature of cooling liquid 137/143°C)
2.0 ± 1
The depth of depression leading to operation of the vacuum valve, atm 0.1
Pressure of testing of a cover, atm 1.4 (pressure should be kept by a cover within not less than 2 minutes)

Air central air

Coolant type R134a
Volume of a coolant, g
  • Petrol models
1050
  • Diesel models
1070
Volume of compressor oil, cm3 120
Type of refrigerator oil Synthetic PAG
Amount of the compressor oil added at replacement of the condenser, cm3 20
Amount of the compressor oil added at replacement of a receiver dehumidifier, cm3 10
Amount of the compressor oil added at replacement to the refrigerator line, cm3 10
Amount of the compressor oil added after a sudden devastation of system (destruction of a connecting path), cm3 40

Efforts of a tightening of carving connections, Nanometer

Cooling system

M112/113

Collars of fastening of hoses of an okhladitelny path 3
Bolts of fastening of a casing of the thermostat (М6) 10
Shtutserny nut of the line of cooling of ATF on a radiator 20
Bolt of fastening of a krylchatka of the fan to the vyazkostny coupling 10
Bolt of fastening of the vyazkostny coupling to the bearing case (it is tightened by means of the special adaptation) 45
Screws of fastening of the generator 42
Bolts of fastening of a damper of a natyazhitel of a belt of a drive of auxiliary units
  • To a natyazhitel
25
  • To the water pump
35
Self-cut bolts of fastening of the water pump to a cover of a drive of GRM
  1. М6
  • The carving is not cut
14
  • The carving is cut
10
  1. М8
  • The carving is not cut
35
  • The carving is cut
25
Bolt of fastening of a pulley of the water pump 10

М612

Screws of fastening of the finishing panel of a cover of a head of cylinders 10
Screws of fastening of the finishing panel of the air distributor 10
Bolts of fastening of a casing of the thermostat 9
Shtutserny nut of the line of cooling of ATF on a maslookhladitel 25
Bolt of fastening of a krylchatka of the fan to the vyazkostny coupling 10
Bolt of fastening of the vyazkostny coupling to the bearing case (it is tightened by means of the special adaptation) 45
Bolt of fastening of a pulley of the water pump 35
Bolts of fastening of the water pump to a cover of a drive of GRM
  • М6
14
  • М8
20

М628

Bolts of fastening of a casing of the thermostat 9
Shtutserny nut of the line of cooling of ATF on a maslookhladitel 25
Bolts of fastening of a bearing beam of a radiator to the front panel 19
Bolt of fastening of a pulley of the water pump 25
Bolts of fastening of the water pump to an engine case 10
Bolt of a collar of fastening of the circulating pump of an additional heater (STH) 4

Heating/ventilation/air conditioning systems

Nut on the broad valve 10
Bolt of fastening of the broad valve to the evaporator heat exchanger 8
Fastening of the sensor switch of pressure/temperature to the pressure head line 8
Bolts of fastening of the compressor
  • M112/113
23
  • M612/628
20
Fastening of refrigerator lines to the compressor
  • M112/113
23
  • M612/628
20
Shtutserny nut of fastening of the refrigerator line to the condenser 33
Fastening of lines to a receiver dehumidifier 17


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5.1. System of cooling of the engine