Air conditioning circuit diagram
- 1 - Fan
- 2 - Evaporator
- 3 - Expansion valve
- 4 - Reservoir
- 5 - Condenser fan
- 6 - Capacitor
- 7 - Compressor
- a - Outside air for cooling the condenser
- b - Warm air exhausted outside
- c - Uncooled air passing through the fan
- d - Cooled air going into the cabin
- A - High pressure, gaseous
- B - High pressure, liquid
- C - Low pressure, liquid
- D - Low pressure, gaseous
Heater housing with heat exchanger and auxiliary heater
- 1 - Heater
- 2 - Coolant return pipe
- 3 - Coolant supply pipe
- 4 — the Holder of pipes of a cooling liquid
- 5 - Bolt
- 6 — a Cover for pipes of a cooling liquid
- 7 - Clamps
- 8 - O-ring, be sure to replace
- 9 - heater heat exchanger
- 10 - Cover (cars without additional heating element). The cover matches the cover of the additional heating element, the plug passages are hermetically sealed
- 11 - Additional heating element. Diesel Models Only Not Equipped with Fuel-Fired Auxiliary Heater
- 12 - Cork
- 13 - Cork
- 14 - Cork. Removing condensation from vehicles with air conditioning
Elements of the interior air conditioning system
- 1 - Air exhaust fan
- 2 - K / V compressor
- 3 — Coupling K/V
- 4 - Condenser
- 5 - Ambient temperature sensor
- 6 - Pressure sensor K / V
- 7 - Battery
- 8 - Drain valve assembly of the evaporator
- 9 - Limiter
- 10 - High pressure valve
- 11 - Low pressure valve
- 12 - Air supply / circulation damper
- 13 - Air temperature sensor in the intake duct
- 14 - Filter
Removing the air conditioner evaporator
- 1 - Latch
- 2 — Heater casing К/В
- 3 - Latch
- 4 - Air supply / circulation damper
- 5 — Grid of an inlet air duct
- 6 - Heater radiator
- 7 - Central damper
- 8 - Foot well heating damper
- 9 - Temperature control damper
See also Section Heating, ventilation and air conditioning.
Work on the air conditioning system must be carried out by specialists.
Fresh air for the heating and ventilation system is sucked in by an electric fan. Before entering the cabin, the air is cleaned by coarse and fine filters.
The air conditioner is capable of both heating (in the heater core) and cool (in the air conditioner evaporator), and dehumidify the air entering the cabin. In wet weather, the incoming fresh air is pre-cooled and then reheated to the set temperature. In this case, condensation of excess moisture in the air occurs, i.e. his drying up. This prevents fogging of the glass.
The air is then distributed through the ventilation nozzles in the vehicle interior.
Hot coolant from the engine cooling system constantly flows through the heater core. The built-in fresh air fan can operate in several stages to control the air flow in the passenger compartment.
If fresh air from outside is not to be taken in, for example in case of poor air quality, the system can be switched to circulation mode. In this mode, only internal air circulates in the cabin. If this continues for a sufficiently long time, the windows inside the cabin will fog up.
The air conditioner consists of a heater and a refrigerator. Air conditioner refrigerator - from a compressor, condenser, throttle, evaporator, refrigerant tank and pipelines. Refrigerant circulates in the system (type R134a), which, depending on temperature and pressure, can be in a liquid or gaseous state.
Compressor The air conditioner is driven by the engine crankshaft using a ribbed belt. It creates pressure 30 atm. in the unit's refrigeration circuit, whereby the refrigerant, which is a gas, is heated. IN condenser refrigerant is cooled by outside air (not entering the salon).In this case, the heated refrigerant condenses, turning into a liquid. Having a lot of pressure, it is passed through throttle, causing its pressure to drop. After that, the refrigerant evaporates, while being strongly cooled. IN evaporator The refrigerant removes heat from the air blown through it. The air is cooling. Cooled air enters the car interior. As a result of heating in the evaporator, the refrigerant turns into a gas and enters the compressor under low pressure, after which the circulation process is repeated.
Warning: If additional work is carried out on electrical equipment during work, it is imperative to disconnect the negative cable (-) battery. To do this, be sure to follow the instructions in Section Replacing the battery.
On models with a diesel engine, an additional heating element is installed that comes into operation at low outside temperatures. The heating element is located directly behind the heat exchanger. After starting the engine, depending on the outside temperature, it warms up the cold air entering the car within a few seconds.
If there is a fault in the heater or air conditioner, it is stored in the fault memory. The fault reader can read information from the memory.
On request, the car can be equipped with an automatic, electronically controlled air conditioner in which the air temperature of the driver and front passenger are regulated separately. Additionally, through the connecting hose from the air conditioner to the glove box, the refrigerator box can be cooled if there is one in the glove box.
The automatic operation mode automatically maintains the temperature in the passenger compartment and removes moisture from the air. In addition, the air temperature, its quantity and distribution are automatically regulated and fluctuations in the outside temperature are compensated. In the economy mode, the air conditioner is turned off, but the heater and the ventilation system continue to work. By turning off the air conditioner, the air conditioner compressor is not running, saving fuel. For diesel engines, additional heating is also switched off. This also results in fuel economy.
Air Conditioner Maintenance Safety Precautions
The air conditioning system must only be serviced by trained technicians who are trained in safe work practices, using the proper equipment, in compliance with depressurization procedures, and who are familiar with the methods of collecting and storing automotive refrigerant.
- Avoid skin contact with refrigerant.
- Wear protective goggles when working near the air conditioning system.
- If refrigerant comes into contact with skin or eyes, do not rub the affected area. Rinse immediately with cold water for at least 15 minutes. Contact a doctor or health facility immediately. Self-medication is not allowed.
- In a new cylinder, the refrigerant is stored under pressure. Store the cylinder at a temperature not exceeding 50°C. Take care not to drop the cylinder from a height or otherwise cause damage to the cylinder.
- Work should be carried out in a well-ventilated area. The refrigerant evaporates quickly and is odorless. Its accumulation leads to a decrease in oxygen supply and difficulty breathing.
- The gaseous refrigerant is heavier than air and must collect relatively quickly at the bottom, such as under a car.
- When the refrigerant burns, poisonous gas is produced. Keep refrigerant away from open flames. Do not smoke. When using a flame leak detector, avoid breathing smoke.
- When carrying out welding work near the air conditioning system, exposure to high temperature or an open flame. Overheating can cause system pressure to rise and ignite.
- Cleaning the condenser or evaporator with steam is not permitted. Use only cold water or compressed air.
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