Air Conditioning System (For Automatic A/c) (Diagnostics - Introduction): Overview Toyota RAV4 IV

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1. IF ANY OF FOLLOWING CONDITIONS ARE MET, KEEP ENGINE IDLING WITH A/C SWITCH ON (ENGINE SPEED AT LESS THAN 2000 RPM) FOR AT LEAST 1 MINUTE: Refrigerant gas has been refilled or air conditioning parts have been replaced. A long time has elapsed since the engine was stopped. NOTE: If the engine speed exceeds 2, 000 rpm, the compressor may be damaged.
2. DO NOT HANDLE REFRIGERANT IN ENCLOSED AREAS OR NEAR OPEN FLAMES
3. ALWAYS WEAR EYE PROTECTION
4. BE CAREFUL NOT TO GET LIQUID REFRIGERANT IN YOUR EYES OR ON YOUR SKIN If liquid refrigerant gets in your eyes or on your skin: Wash the area with lots of cold water. WARNING: Do not rub your eyes or skin. Apply clean petroleum jelly to the skin. Go immediately to a physician or hospital for professional treatment.
5. NEVER HEAT CONTAINER OR EXPOSE IT TO OPEN FLAME
6. BE CAREFUL NOT TO DROP CONTAINER OR SUBJECT IT TO PHYSICAL SHOCKS
7. DO NOT OPERATE COMPRESSOR WITH INSUFFICIENT REFRIGERANT IN REFRIGERANT SYSTEM If there is not enough refrigerant in the refrigerant system, oil lubrication will be insufficient and compressor burnout may occur. Necessary care should be taken to avoid this.
8. DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE WHILE COMPRESSOR IS OPERATING Open and close only the low pressure valve. Opening and closing the high pressure valve could cause the charging cylinder to rupture.
9. BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH REFRIGERANT If the refrigerant is overcharged, it causes problems such as insufficient cooling, poor fuel economy and engine overheating.
10. DO NOT OPERATE ENGINE AND COMPRESSOR WITHOUT REFRIGERANT NOTE: This may damage the inside of the compressor.
11. IGNITION SWITCH EXPRESSIONS HINT: The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this section. Expression Ignition Switch (position) Engine Switch (condition) Ignition Switch off Off Off Ignition Switch ON ON On (IG) Ignition Switch ACC ACC On (ACC) Engine Start START Start

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COMMUNICATION TABLE

1. *: w/ PTC Heater

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1. GENERAL The air conditioning system has the following features: In accordance with the temperature set using the temperature control switch, the air conditioning amplifier determines the outlet temperature based on the input signals from various sensors. In addition, corrections are made in accordance with the signals from the water temperature sensor to control the outlet air temperature. Controls the blower motor in accordance with the airflow volume determined by the air conditioning amplifier based on the input signals from various sensors. Automatically changes the outlets in accordance with the outlet mode ratio that is determined by the air conditioning amplifier based on the input signals from various sensors. Based on the signals from the ambient temperature sensor, this system calculates the outside temperature and indicates it in the multi-information display in the combination meter assembly. The left/right independent temperature control and neural network control make air conditioner control available to suit the person in the driver seat and in the passenger seat. Turns the rear defogger and outside rear mirror heaters on for 15 minutes when the rear defogger switch is pressed. Turns them off if the switch is pressed while they are operating. Checks the sensors in accordance with the operation of the air conditioner switches. The air conditioning amplifier has the function of controlling the indicator lighting.
2. MODE POSITION AND DAMPER OPERATION Control Damper Control Position Damper Position Operation Air Inlet Control Damper FRESH A Brings in fresh air. RECIRC B Recirculates internal air. Air Mix Control Damper (Left/Right Independent Control) Driver and Front Passenger Side MAX COOL to MAX HOT (TEMP. SETTING 18 to 32°C (65 to 85°F)) C, D, E Varies mixture ratio of fresh air and recirculation air in order to regulate temperature continuously from HOT to COOL. Mode Control Film Damper Driver and Front Passenger Side FACE I, J, L, P, U Air blows out of center registers and side registers. BI-LEVEL I, Q, M, R, T Air mainly blows out of center registers, side registers, and footwell register ducts. FOOT H, K, N, O, S Air mainly blows out of front and rear footwell register ducts. In addition, air blows out slightly from front and side defrosters, and side registers. FOOT/DEF G, K, N, O, T Air mainly blows out of front and side defrosters to defrost windshield. Air also blows out from front and rear footwell register ducts, and side registers. DEF F, K, N, O, U Air blows out of front and side defrosters and side registers to defrost windshield.
3. AIR OUTLET AND AIRFLOW VOLUME The circle size (o) indicates the proportion of the flow volume. Air Outlet Mode Air Outlet Position Symbol A B C D Center Face Side Face Foot Defroster FACE X X BI-LEVEL X FOOT X FOOT/DEF X DEF X X

See also:
• INSPECTION