Mercedes M-Class W163
since 1997 of release
Repair and car operation
+ Mercedes-Benz Cars of a class M (W163)
+ Governing bodies and receptions of safe operation
+ Current leaving and service
- Systems of cooling, heating and air conditioner
+ System of cooling of the engine
- Systems of ventilation, heating and air conditioning
General information and security measures
Removal and control panel installation by functioning of systems of heating/ventilation/air conditioning (for models 163.113/136/154/172/174 on 31.8.01)
Removal and installation of the salonny filter
Removal and installation of the fan of the heater/conditioner of air and its resistive assembly
Removal and installation of the heat exchanger of a heater
Removal and installation of the step-by-step electromotor of a drive of a zaslonka of switching of modes of air circulation
Removal and installation of the electromotor of a drive of a mixing zaslonka
Removal and installation of a casing of the heat exchanger of the heater/evaporator of the conditioner of air
Fast check of serviceability of functioning of central air of air
Removal and installation of auxiliary ventilyatorny assembly, - models 163.136/154/157/172 of the corresponding complete set
Removal and installation of the podsasyvayushchy fan of the sensor of temperature of salonny air, - models 163.113/136/154/157/172/174 with 1.9.99 on 31.8.01
Removal and installation of the sensor of temperature of external air, - except models 163.128
Removal and installation of the sensor of temperature of the evaporator
Removal of a casing of the To/in evaporator
Removal and To/in evaporator installation
Removal and To/in condenser installation
Removal and installation of the broad valve
Removal and receiver dehumidifier installation
Removal and installation of the module of management To/in (for models 163.113/136/154/172/174 on 31.8.01)
+ the Power supply system and production of the fulfilled gases
+ Systems of electric equipment of the engine
+ Manual box of gear shifting
+ Avtomaticheckaya transmission
+ Transmission line
+ Brake and auxiliary systems
+ Suspension bracket and steering
+ Onboard electric equipment
Systems of ventilation, heating and air conditioning
General information and security measures
The air submitted by system of ventilation to salon of the car through the filter, can be warmed up or cooled depending on a choice of the driver and passengers. The heater or the conditioner settle down in salon, in the case under the dashboard. All stream of air submitted to salon goes for heating or cooling through the same casing. The temperature and speed of a stream of air is regulated by means of governing bodies located on the control panel.
Heat allocated at operation of the engine, is transferred by cooling liquid to the radiator of a heater located in salon. The brought stream of air from system of ventilation passes through a radiator and heats up heat of cooling liquid of the engine proceeding in a radiator. Extent of heating is regulated by means of mixing in a certain ratio of cold and hot air by means of a mixing zaslonka with the servo-driver.
The used air is removed from salon through ventilating openings with return valves.
The increase in a consumption of air via the heat exchanger provides the fan of fresh air.
If it is necessary to disconnect supply of fresh air, for example, at a bad smell, the system is switched in a circulation mode at which in salon air available there circulates only.
System switching in a mode of circulation proves to be true activation of a control lamp (see. Head Governing bodies and receptions of safe operation).
Central air of air of salon
Scheme of a contour of the conditioner of air
The function chart of typical central air of air is presented on an illustration. Works with central air should be carried out by a specialized workshop. At all do not open a contour of circulation of a coolant as at contact with skin the coolant can cause frostbite.
By means of central air air temperature in salon can go down below external temperature. At system work humidity in salon decreases. In the crude weather, arriving fresh air previously it is cooled, then again heats up to the set temperature. Thus its drainage is made. By means of this procedure the zapotevaniye of glasses is removed.
Central air consists of the compressor, the condenser, a throttle, the evaporator, capacity with a coolant and connecting pipelines.
Central air of air consists of the condenser located before a radiator of system of cooling, the evaporator located in the general casing with the heat exchanger of a heater, the compressor, a receiver/dehumidifier, and also the refrigerator tubes connecting components listed above. On an entrance of the evaporator the zaslonka providing pressure difference, necessary for system functioning is established. As working liquid in a path of To/in system the coolant of the R134а type changing the modular condition depending on a combination of defining parameters (temperature and pressure) is used.
The fan provides supply of salonny air to the evaporator functioning by a principle, a return principle of functioning of a radiator, in the carburetor heat is selected from air and transferred to a coolant. Being warmed up, the coolant evaporates and on an exit from the evaporator passes to a gaseous state.
The compressor of the conditioner is given in rotation from a cranked shaft of the engine by means of a belt drive and provides in a working path of system superfluous pressure to 30 atm. As a result of adiabatichesky compression the coolant which was in a gaseous state, heats up. Arriving in the condenser a coolant it is cooled with a through stream of external air and, being condensed, turns into the liquid which was under a high pressure. At a transmission through a throttle pressure of a liquid coolant is dumped. Further, the coolant evaporates in a contour, at the same time strongly being cooled and, passing through the evaporator, selects heat from air blown through it. The cooled air moves in car salon. As a result of heating in the evaporator the coolant turns into gas of low pressure and again arrives in the compressor then process of circulation repeats.
Security measures at service of components of central air
Central air should be served by exclusively prepared technicians trained in safe working methods, with use of the appropriate equipment with observance of rules of the depressurization, acquainted with receptions of collecting and order of storage of an automobile coolant.