1996 Lexus ES300 Service & Repair Manual
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–
AIR CONDITIONING SYSTEM
– AIR CONDITIONING SYSTEM
AC–1
GENERAL INFORMATION
REFRIGERATION SYSTEM
AC002–01
Prevention of Refrigerant Release and
Excessive Quantities
Refrigerant (CFCs) for automobile air conditioning is believed
to cause harm by depleting the ozone layer which helps to
protect us from the ultraviolet rays of the sun.
Therefore, it is necessary to prevent release of refrigerant to
the atmosphere and to use the minimum amount when
servicing the air conditioning.
1. USE RECOVERY MACHINE TO RECOVER
REFRIGERANT
When discharging refrigerant from the system as follows, use
a recovery machine to recover the refrigerant.
• Before replacing parts on the refrigerant line.
• When moisture or air gets in the refrigerant line.
• When excess refrigerant is charged.
NOTICE:
• When handling the recovery machine, always follow the
directions given in the instruction manual.
• After recovery, the amount of compressor oil removed
must be measured and the same amount added to the
system.
2. USE CHARGING HOSES WITH STOP VALVE WHEN
INSTALLING MANIFOLD GAUGE SET
To prevent release of refrigerant, using charging hoses with
a stop valve when installing the manifold gauge set to the
service valves on the refrigerant line.
3. TIGHTEN CONNECTION PARTS SECURELY
Follow the notices about tightening connecting parts in step
6 on page AC–4.
4. PROPERLY EVACUATE AIR FROM REFRIGERANT
SYSTEM
To prevent release and wasteful use of refrigerant, evacuate
air with care from refrigeration system as follows:
• Do not evacuate before recovering refrigerant in
system.
• Do not perform repeat evacuation of system.
AC–2
– AIR CONDITIONING SYSTEM GENERAL INFORMATION
5. USE CHARGING CYLINDER TO CHARGE PROPER
AMOUNT OF REFRIGERANT
To prevent excessive use of refrigerant due to overcharging,
use a charging cylinder to charge the proper amount of
refrigerant.
Handling Precautions for refrigerant
1. DO NOT HANDLE REFRIGERANT IN AN ENCLOSED
AREA OF NEAR AN OPEN FLAME
2. ALWAYS WEAR EYE PROTECTION
3. BE CAREFUL THAT LIQUID REFRIGERANT DOES NOT
GET IN YOUR EYES OR ON YOUR SKIN
If liquid refrigerant gets in your eyes or on your skin:
(a) Wash the area with lots of cool water.
CAUTION: Do not rub your eyes or skin.
(b) Apply clean petroleum jelly to the skin.
(c) Go immediately to a physician or hospital for professional
treatment.
CAUTION: Do not attempt to treat yourself.
Handling Precautions For Refrigerant
Container
1. NEVER HEAT CONTAINER OR EXPOSE IT TO NAKED
FLAME
2. BE CAREFUL NOT TO DROP CONTAINER AND NOT TO
APPLY PHYSICAL SHOCKS TO IT
– AIR CONDITIONING SYSTEM GENERAL INFORMATION
AC–3
Handling Precautions for Gas–Cylinder
Type Gas Leak Tester
1. BEFORE USING TESTER MAKE SURE THAT THERE ARE
NO FLAMMABLE SUBSTANCES NEARBY
2. BE CAREFUL NOT TO INHALE POISONOUS GAS
If refrigerant gas comes in contact with flame, a poisonous
gas is produced. During leak tests, do not inhale any gas.
Precautions When Replacing Parts In
Refrigerant Line
1. RECOVER REFRIGERANT IN SYSTEM BEFORE
REMOVING PARTS
Using a recovery machine, recover refrigerant in system
before removing the parts.
NOTICE: Do not release refrigerant to atmosphere.
2. INSERT PLUG IMMEDIATELY IN DISCONNECTED PARTS
Insert a plug immediately in the disconnected parts to
prevent the entry of moisture and dust.
3. DO NOT REMOVE PLUG FROM NEW PARTS UNTIL
IMMEDIATELY BEFORE INSTALLATION
4. DO NOT USE BURNER FOR BENDING OR
LENGTHENING OPERATIONS ON TUBE
If the tubes are heated with a burner, a layer of oxidation
forms inside the tube, causing the same kind of trouble as an
accumulation of dust.
5. DISCHARGE GAS IN NEW COMPRESSOR FROM
CHARGING VALVE BEFORE INSTALLING IT
If the gas in new compressor is not discharged first,
compressor oil will spray out with gas when the plug is
removed.
6. TIGHTEN CONNECTING PARTS SECURELY
Securely tighten the connecting parts to prevent leaking of
refrigerant gas.
• Apply a few drops of compressor oil to O–ring fittings for
easy tightening and to prevent leaking of refrigerant
gas.
• Tighten the nuts using two wrenches to avoid twisting
the tube.
AC–4
– AIR CONDITIONING SYSTEM GENERAL INFORMATION
• Tighten the O–ring fittings or the bolted type fittings to
the specified torque.
Precautions When Charging Refrigerant
1. DO NOT OPERATE COMPRESSOR WITHOUT ENOUGH
REFRIGERANT IN REFRIGERANT CYCLE
If there is not enough refrigerant in the refrigerant cycle, oil
lubrication will be insufficient and compressor burnout may
occur, so takecare to avoid this.
2. DO NOT OPEN HIGH PRESSURE VALVE OF MANIFOLD
WITH COMPRESSOR OPERATING
If the high pressure valve is opened, refrigerant flows in the
reversedirection and could cause the charging cylinder to
rupture, so open and close the low pressure valve only.
3. BE CAREFUL NOT TO OVERCHARGE WITH
REFRIGERANT IN SYSTEM
If refrigerant is overcharged, it causes trouble such as
insufficient cooling, poor fuel economy, engine overheating
etc.
ELECTRICAL PARTS
AC003–01
Before removing and inspecting the electrical parts, set the
ignition switch to the LOCK position and disconnect the
negative (–) terminal cable from battery.
CAUTION: Work must not be started until after at least 30
seconds or longer from the time the negative (–) terminal
cable is disconnected.
SRS AIRBAG SYSTEM
AC004–01
Failure to carry out service operations in the correct
sequence could cause the airbag system to deploy, possibly
leading to a service accident. When removal or installation of
the parts and the yellow wire harness and connector for the
airbag is necessary, refer to the precautionary notices in the
AB section before performing the operation.
– AIR CONDITIONING SYSTEM GENERAL INFORMATION
AC–5
DESCRIPTION
FEATURES
AC05K–01
The microprocessor controlled automatic air conditioning is a system which controls the cabin air
conditioning automatically using a microcomputer.
The microcomputer senses the air temperature outside and inside the cabin, the amount of sunlight, the
compressor operating condition and temperature setting, etc. and maintains the optimum blower air
temperature and air flow at the intakes and outlets automatically.
PARTS LOCATION
AC05L–01
AC–6
– AIR CONDITIONING SYSTEM DESCRIPTION
PARTS LOCATION (CONT’D)
– AIR CONDITIONING SYSTEM DESCRIPTION
AC–7
OPERATION OF DAMPERS
AC05M–01
AC–8
– AIR CONDITIONING SYSTEM DESCRIPTION
CONTROL FUNCTIONS
AC05N–01
Interior Room Temperature Control System
(a) The desired temperature is set using the TEMP switch.
(b) From the input signals (room temperature sensor, ambient temperature sensor, evaporator temperature
sensor and solar sensor) and the temperature setting, the air conditioning control ECU determines the air
flow volume and outputs signals to the air mix servomotor.
(c) When it receives signals from the ECU, the air mix servomotor opens or closes the air mix damper to
change the air flow temperature. When the temperature reaches the specified temperature, it is detected
by the air mix damper position sensor and the ECU stops the servomotor.
HINT: if the desired temperature setting is MAX COLD, the ECU forcedly sets the air mix damper to the
Max Cool position. If it is set at MAX HOT, the ECU forcedly sets the air mix damper to the Max Hot position.
– AIR CONDITIONING SYSTEM DESCRIPTION
AC–9
Blower Fan Speed Control System
(When AUTO Switch is ON)
(a) The desired temperature is set using the TEMP switch.
(b) From the input signals (room temperature sensor, ambient temperature sensor and solar sensor) and the
temperature setting, the air conditioning control ECU determines the air flow volume and outputs signals
to the power transistor.
(c) When it receives signals from the ECU, the power transistor increases or reduces the blower motor speed
to control the air flow volume.
(When Manual Switch is selected)
The ECU turns the power transistor increasing or reducing the blower motor speed and fixing the air flow
volume in accordance with the position of the Manual switch.
AC–10
– AIR CONDITIONING SYSTEM DESCRIPTION
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Lifetime Access
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Print one or all pages of your manual
$36.99
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