2001 TOYOTA AVALON Service Repair Manual

I01450
Condition: Insufficient cooling
I01393
Condition : Does not cool AC-8
- AIR CONDITIONINGAIR CONDITIONING SYSTEM
1930 Author
: Date
:
2001 AVALON (RM808U)
(8) Expansion valve improperly
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy
 Pressure too high on both low
and high pressure sides
 Frost or large amount of dew on
piping on low pressure side
Trouble in expansion valve
 Excessive refrigerant in low
pressure piping
 Expansion valve opened too
wide
Check expansion valve
Replace if defective
(9) Defective compression compressor
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy
 Pressure too high on low and
high pressure sides
 Pressure too low on high pres-
sure side
Internal leak in compressor
 Compression defective
 Valve leaking or broken sliding
parts
Repair or replace compressor

N14519
Drain Hose
- AIR CONDITIONINGAIR CONDITIONING SYSTEM
AC-9
1931 Author
: Date
:
2001 AVALON (RM808U)
3. INSPECT FOR LEAKAGE OF REFRIGERANT
(a) Perform in these conditions:
Stop engine.
Secure good ventilation (If the gas leak detector
may not react to volatile gases which are not refrig-
erant, such as evaporated gasoline and exhaust
gas.)
Repeat the test 2 or 3 times.
Make sure that there is some refrigerant remaining
in the refrigeration system.
When compressor is OFF: approx. 392 - 588 kPa
(4 - 6 kgf/ cm
2, 57 - 85 psi)
(b) Bring the gas leak detector close to the drain hose before
performing the test.
HINT:
After the blower motor has stopped, leave the cooling unit
for more than 15 minutes.
Expose the gas leak detector sensor under the drain
hose.
When bring the gas leak detector close to the drain hose,
make sure that the gas leak detector does not react to the
volatile gases.
If such reaction is unavoidable, the vehicle must be lifted up.
(c) If gas leak is not detected on the drain hose, remove the
blower resistor from the cooling unit. Then insert the gas
leak detector sensor into the unit and perform the test.
(d) Disconnect the connector and leave the pressure switch
for approx. 20 minutes. Then bring the gas leak detector
close to the pressure switch and perform the test.
(e) Bring the gas leak detector close to the refrigerant lines
and perform the test.

AC-10
- AIR CONDITIONINGAIR CONDITIONING SYSTEM
1932 Author
: Date
:
2001 AVALON (RM808U)
4. INSPECT IDLE-UP SPEED
(a) Warm up engine.
(b) Inspect idle-up speed when the these conditions are es-
tablished.
Test conditions:
Idle speed set correctly.
Steering wheel straight ahead
Blower speed control switch at HI
A/C switch ON
Steering wheel straight ahead
Magnetic clutch conditionIdle speed
Magnetic clutch not engaged700 ±50 rpm
Magnetic clutch engaged700 ±50 rpm
If idle speed is not as specified, check the IAC valve and idle
control system (See page SF-43,DI-102 ).

AC2810
AC0Y9-02
AC2811
N11084
Wrong Okay
HI LO HILO
- AIR CONDITIONINGAIR CONDITIONING SYSTEM
AC-1
1923 Author
: Date
:
2001 AVALON (RM808U)
AIR CONDITIONING SYSTEM
PRECAUTION
1. DO NOT HANDLE REFRIGERANT IN AN ENCLOSED
AREA OR WEAR EYE PROTECTION
2. ALWAYS WEAR EYE PROTECTION
3. 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.
(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.
4. NEVER HEAT CONTAINER OR EXPOSE IT TO NAKED
FLAME
5. BE CAREFUL NOT TO DROP CONTAINER AND NOT
TO APPLY PHYSICAL SHOCKS TO IT
6. DO NOT OPERATE COMPRESSOR WITHOUT
ENOUGH REFRIGERANT IN REFRIGERATION SYS-
TEM
If there is not enough refrigerant in the refrigerant system oil lu-
brication will be insufficient and compressor burnout may occur,
so that care to avoid this, necessary care should be taken.
7. DO NOT OPEN PRESSURE MANIFOLD VALVE WHILE
COMPRESSOR IS OPERATE
If the high pressure valve is opened, refrigerant flows in the re-
verse direction and could cause the charging cylinder to rup-
ture, so open and close the only low pressure valve.
8. BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH
REFRIGERANT
If refrigerant is overcharged, it causes problems such as insuffi-
cient cooling, poor fuel economy, engine overheating etc.

AC-2
- AIR CONDITIONINGAIR CONDITIONING SYSTEM
1924 Author
: Date
:
2001 AVALON (RM808U)
9. SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
The AVALON is equipped with an SRS (Supplemental Restraint
System) such as the driver and front passenger airbag. Failure
to carry out service operation in the correct sequence could
cause the SRS to unexpectedly deploy during servicing, possi-
bly leading to a serious accident. Before servicing ( including re-
moval or installation of parts, inspection or replacement), be
sure to read the precautionary notices in the RS section.

AC2FY-01
I12951
N´m (kgf´cm, ft´lbf): Specified torque

Non-reusable part
Instrument Panel
Reinforcement
Brace
A/C Unit
Rear Heater Duct
Piping Clamp

O-RingSuction Tube
Liquid Tube
Piping Clamp
Blower Unit
No. 3 Heater to Register Duct
DuctBrace

O-Ring
AC-26
- AIR CONDITIONINGAIR CONDITIONING UNIT
1948 Author
: Date
:
2001 AVALON (RM808U)
COMPONENTS

I12952
Air DuctHeater Radiator
Unit Case LH
Evaporator
Unit Case RHExpansion Valve
Liquid and
Suction Tube
Air Outlet Servomotor
Air Vent Duct
Auto A/C:
Aspirator HoseDrain Hose
Evaporator Temp.
Sensor
5.4 (55, 48 in.´lbf)
N´m (kgf´cm, ft´lbf) : Specified torque

Non-reusable part
x 10

O-Rings
AspiratorAuto A/C:
Air Mix Servomotor
(Passenger side)

O-Rings
Auto A/C
Air Mix Servomotor
(Driver side)
Air Duct
Plate
- AIR CONDITIONINGAIR CONDITIONING UNIT
AC-27
1949 Author
: Date
:
2001 AVALON (RM808U)

AC2HX-01
I14049
I14050
AC-30
- AIR CONDITIONINGAIR CONDITIONING UNIT
1952 Author
: Date
:
2001 AVALON (RM808U)
DISASSEMBLY
1. REMOVE AIR VENT DUCT
2. REMOVE EVAPORATOR TEMP. SENSOR
Pull out the sensor.
3. REMOVE EXPANSION VALVE
Using a hexagon wrench, remove the 2 bolts and separate the
evaporator, expansion valve, liquid and suction tube.
Torque: 5.4 N´m (55 kgf´cm, 48 in.´lbf)
HINT:
At the time of reassembly, please refer to the following item.
Lubricate 4 new O-rings with compressor oil and install them
to the valve.
4. Auto A/C only:
REMOVE BLOWER MOTOR LINEAR CONTROLLER
Remove the 2 screws and controller.
5. REMOVE BLOWER RESISTOR
Remove the 2 screws and blower resistor.
6. Auto A/C only:
REMOVE AIR MIX SERVOMOTOR (Driver side)
Remove the 3 screws and servomotor.
7. Auto A/C only:
REMOVE AIR MIX SERVOMOTOR (Passenger side)
Remove the 3 screws and servomotor.
8. REMOVE AIR OUTLET SERVOMOTOR
Remove the 3 screws and servomotor.
9. REMOVE ASPIRATOR
Remove the screw and aspirator.
10. REMOVE HEATER RADIATOR
(a) Remove the air duct.
(b) Remove the 2 screws and 2 clamps.
(c) Pull out the heater radiator.