LEXUS RX 300
1998 — 2003 of release
Repair and operation of the car
Lexus RX 300
+ Lexus RX-300 cars
+ Governing bodies and methods of operation
+ Settings and routine maintenance of the car
- Cooling systems of the engine, heating, ventilation and air conditioning
+ Engine cooling system
- Systems of heating, ventilation and air conditioning
Replacement, dismantling and assembly of the K/V block
Removal, dismantling, assembly and installation of the block of the fan of a heater
Check and replacement of the compressor and K/V magnetic coupling
Removal and installation of the K/V condenser
Checks of components of systems of heating and To/in
Removal and installation of the control unit
+ A power supply system and production of the fulfilled gases
+ Systems of electric equipment of the engine
+ Automatic transmission and interaxal differential
+ Transmission line
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
+ Schematic diagrams of electric connections
Systems of heating, ventilation and air conditioning
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 of the modes of a heater located on the dashboard the gate opens, and hot air begins to come to interior of the car. If to turn on the heater fan, air will move in salon more intensively. The fan can work with different degree of intensity. For a possibility of rotation of the fan with various speed the resistor is installed. At the closed OZh gate comes on a small contour back to an engine radiator contour.
Components of system of heating and To/in in salon
Before getting to salon, air passes through the filter in which the main share of dust settles. It is necessary to observe frequency of replacement of the filter since the filter hammered with dust limits air supply that will lead to an air stagnation in salon.
Distribution of streams of air of system of ventilation is carried out also by means of gates. On all models the air circulation mode is provided.
The air conditioning system (K/V) is included in a basic equipment of the cars considered in the present manual.
Works with the K/V system have to be performed in a specialized workshop. Do not open a coolant circulation contour as at contact with skin coolant can cause a frostbite. Procedures of repair of the K/V system in the present manual are not considered.
By means of the K/V system can lower air temperature in salon rather external temperature. During the work of system humidity in salon decreases. During wet weather, the 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 fogging of glasses.
The K/V system consists of the compressor, the condenser, the evaporator, container with coolant and pipelines. In system coolant (R134a type) which depending on temperature and pressure can be in liquid or gaseous state circulates.
Components of the K/V system in a motive compartment
The compressor of the conditioner is given by a multiridge belt from a bent shaft of the engine. He creates pressure in a contour of the coolant representing gas and causes its heating. In the condenser coolant is cooled with external air. Thereof the warmed coolant is condensed, turning into liquid. Under high pressure it is passed via the valve therefore its pressure falls. After that coolant evaporates in a contour, at the same time strongly being cooled. In the evaporator coolant selects heat from the air blown through it. Thereof air is cooled. The cooled air comes to interior of the car. As a result of heating in the evaporator coolant turns into gas and under low pressure comes to the compressor then process of circulation repeats.
Security measures at service To/in
The K/V system has to 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 methods of collecting and storage of automobile coolant.