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5. Cooling systems, heating, ventilation and air conditioning

General information

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 which is switched on in 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 a radiator cover / a broad tank, 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 the Current leaving and service) 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 a working body are excluded.

On some petrol models, and also on diesel models with the M612 engine the preliminary electric heater providing the accelerated engine warming up in cold weather is built in a contour of a water path of the cooling system. Food on the heater can move from network of power supply of 230 or 115 Century. Power of consumption of a heating element makes 500 W.

The electric heater can be installed on the corresponding models in an individual order as an element of an additional complete set.

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 (for more details see the Part of the Device of ensuring comfort), 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 via the special filter in which 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 the Current leaving and service). 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 is carried out by means of servomotors.

Air conditioning system

See the Section General information and security measures.

Specifications

Cooling system

General parameters

Cooling system type Closed, with the water pump, the thermostat, a radiator, the fan (electric or with a viscous clutch coupling) and separately installed broad tank
Volume of cooling liquid See Specifications
Composition of cooling liquid (an antifreeze share in cooling liquid for ensuring frost resistance)
  • to -37 °C
50%
  • to -45 °C
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
  • Beginning of opening
85 ÷ 89
  • Full opening
102

Diesel models

Data are absent

Cover of a path of the cooling system

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

Air conditioning system

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

Efforts of tightening of threaded connections, Nanometer

Cooling system

M112/113

Collars of fastening of hoses of a cooling path 3
Bolts of fastening of a casing of the thermostat (M6) 10
Nipple nut of the line of cooling of ATF on a radiator 20
Bolt of fastening of a krylchatka of the fan to the viscous coupling 10
Bolt of fastening of the viscous coupling to the bearing case (drags on by means of special adaptation) 45
Screws of fastening of the generator 42
Bolts of fastening of a damper of a natyazhitel of a belt of the drive of auxiliary units
  • To a natyazhitel
25
  • To the water pump
35
Self-cut bolts of fastening of the water pump to a GRM drive cover
  1. M6
  • The carving is not cut
14
  • The carving is cut
10
  1. M8
  • The carving is not cut
35
  • The carving is cut
25
Bolt of fastening of a pulley of the water pump 10

M612

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
Nipple nut of the line of cooling of ATF on the oil cooler 25
Bolt of fastening of a krylchatka of the fan to the viscous coupling 10
Bolt of fastening of the viscous coupling to the bearing case (drags on by means of special adaptation) 45
Bolt of fastening of a pulley of the water pump 35
Bolts of fastening of the water pump to a GRM drive cover
  • M6
14
  • M8
20

M628

Bolts of fastening of a casing of the thermostat 9
Nipple nut of the line of cooling of ATF on the oil cooler 25
Bolts of fastening of the bearing radiator beam 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 circulation pulser of an additional heater (STH) 4

Systems of heating/ventilation/air conditioning

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
Nipple nut of fastening of the refrigerator line to the condenser 33
Fastening of lines to a receiver dehumidifier 17