LEXUS RX 300

1998 — 2003 of release

Repair and car operation

Systems of heating, ventilation and air conditioning

General information

Description of systems

The system of heating consists of the fan and the heat exchanger located in the uniform block. Hot OZh passes through the heat exchanger. When moving the handle of management by modes of the heater, located on the dashboard, the zaslonka opens, and hot air starts to arrive in car salon. If to turn on the heater fan, air will move in salon more intensively. The fan can work with different degree of intensity. For possibility of rotation of the fan with various speed the resistor is established. At the closed zaslonka of OZh arrives on a small contour back in a contour of a radiator of the engine.

Components of system of heating and To/in in salon

1 — the sun Sensor 2 — the temperature Sensor in salon 3 — the Control unit 4 — the Broad valve 5 — the Evaporator 6 — Э / the motor of supply of external air	7 — the Filter of system of ventilation 8 — Э / the fan motor 9 — the Relay э / the fan motor 10 — Э / the motor of production of air 11 — Э / the motor of mixing of air 12 — the heater Heat exchanger 13 — the Sensor of temperature of the evaporator

Before getting to salon, air passes through the filter in which the main share of a dust settles. It is necessary to observe periodicity of replacement of the filter since the filter hammered by a dust limits supply of air that will lead to an air stagnation in salon.

Distribution of streams of air of system of ventilation is carried out also with the help a zaslonok. On all models the air circulation mode is provided.

Air central air (To/in) enters into a standard complete set of cars considered in the real Management.

Works with To/in system should be carried out in a specialized workshop. Do not open a contour of circulation of a coolant as at contact with skin the coolant can cause frostbite. Procedures of repair of To/in system in the real Management are not considered.

By means of To/to system air temperature in salon can lower rather 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 it is possible to get rid of a zapotevaniye of glasses.

The To/in system consists of the compressor, the condenser, the evaporator, capacity with a coolant and pipelines. In system the coolant (R134á type) which depending on temperature and pressure can be in a liquid or gaseous state circulates.

To/in system components in an impellent compartment

1 — the Condenser 2 — Assembly of fans (the condenser fan) 3 — the Compressor and the magnetic coupling 4 — the Relay of the magnetic coupling	5 — the Block of the relay and safety locks in an impellent compartment 6 — the pressure Sensor 7 — the Sensor of temperature of external air

The compressor of the conditioner is given by a multiridge belt from a cranked shaft of the engine. He creates pressure in a contour of the coolant representing gas, and causes its heating. In the condenser the coolant is cooled with external air. Thereof the warmed-up coolant is condensed, turning into liquid. Under a high pressure it is passed via the valve therefore its pressure falls. After that the coolant evaporates in a contour, at the same time strongly being cooled. In the evaporator the coolant selects heat from air blown through it. Thereof air is cooled. The cooled air arrives in car salon. As a result of heating in the evaporator the coolant turns into gas and under low pressure arrives in the compressor then process of circulation repeats.

Security measures at service To/in

The To/in system should be served by exclusively prepared technicians trained in safe working methods with use of the appropriate equipment and with observance of rules of depressurization, and also acquainted with receptions of collecting and storage of an automobile coolant.

• Do not allow contact of a coolant to skin;
• At work near central air put on goggles;
• At coolant hit on skin or in eyes do not pound the struck place. Immediately wash out the struck site cold water within not less than 15 minutes. Immediately address for medical care in medical institution. Self-treatment is not allowed;
• The coolant is stored in a new cylinder under pressure. Store a cylinder at temperature not above the +50th hail. Take the measures excluding falling of a cylinder from height or other situations which can lead to its damage;
• Works should be carried out in well aired room. The coolant quickly evaporates, leads to reduction of access of oxygen and the complicated breath;
• The gaseous coolant is heavier some air and rather quickly should gather below, for example, under the car;
• At combustion of a coolant poisonous gas is formed. Store a coolant far from open sources of fire. Do not smoke at work with To/in system;
• At carrying out welding works near To/in system do not subject to its influence of high temperature or an open flame. The overheat can lead to pressure increase in system and to ignition;
• Condenser or evaporator cleaning by means of water vapor is not allowed. It is necessary to use only cold water or the compressed air.