cooling LEXUS ES300 2005 Repair Manual

550BQ-01
AC2810
AC2811
N11084
Wrong Okay
HI
LO HI LO
- HEATER & AIR CONDITIONERAIR CONDITIONING SYSTEM
55-1
2616 Author
: Date
:
2005 LEXUS ES330 REPAIR MANUAL (RM1124U)
AIR CONDITIONING SYSTEM
PRECAUTION
1. DO NOT HANDLE REFRIGERANT IN AN ENCLOSED
AREA OR NEAR AN OPEN FLAME
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 REFRIGERANT SYSTEM
If there is not enough refrigerant in the refrigerant system oil lu-
brication will be insufficient and compressor burnout may occur,
so take care to avoid this, necessary care should be taken.
7. DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE
WHILE COMPRESSOR IS OPERATING
If the high pressure valves 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.

550D4-02
I31521
Sight Glass
55-2
- HEATER & AIR CONDITIONERREFRIGERANT
2617 Author
: Date
:
2005 LEXUS ES330 REPAIR MANUAL (RM1124U)
REFRIGERANT
ON-VEHICLE INSPECTION
1. INSPECT REFRIGERANT VOLUME
(a) Observe the sight glass on the cooler refrigerant liquid
pipe A.
Test conditions:

Running engine at 1,500 rpm

Blower speed control switch at ºHIº

A/C switch ON

Temperature control dial at ºMAX. COOLº

Fully open the doors
ItemSymptomAmount of refrigerantCorrective Actions
1Bubbles presentInsufficient*
(1) Check for gas leakage and repair if nec-
essary
(2) Add refrigerant until bubbles disappear
2No bubbles presentNone, insufficient or too muchRefer 3 and 4
3No temperature difference between com-
pressor inlet and outletEmpty or nearly empty
(1) Check for gas leakage with gas leak de-
tector and repair if necessary
(2) Add refrigerant until bubbles disappear
4Considerable temperature difference be-
tween compressor inlet and outlet.Correct or too muchRefer to 5 and 6
5Immediately after air conditioning is turned
off, refrigerant clearToo much
(1) Discharge refrigerant
(2) Remove air and supply proper amount or
purified refrigerant
6
Immediately after air conditioning is turned
off, refrigerant foams and then becomes
clear
Correct-
*: Bubbles in the sight glass with ambient temperatures higher than usual can be considered normal if cooling
is sufficient.

I22118
Condition: Cooling system does not function effectively.
I22119
Condition: Cooling system close not function effectively. 55-4
- HEATER & AIR CONDITIONERREFRIGERANT
2619 Author
: Date
:
2005 LEXUS ES330 REPAIR MANUAL (RM1124U)
(3) Insufficient cooling
SymptomProbable causeDiagnosisCorrective Actions

Pressure low on both low and
high pressure sides

Bubbles seen thought sight glass
continuously

Insufficient cooling performance
Gas leakage in refrigeration sys-
tem
Insufficient refrigerant

Refrigerant leaking
(1) Check for gas leakage and re-
pair if necessary
(2) Supply proper amount of new
refrigerant
(3) If indicated pressure value is
close to a 0 when connected to
gauge, create the vacuum after in-
specting and repairing location of
leak
(4) Poor circulation of refrigerant
SymptomProbable causeDiagnosisCorrective Action

Pressure low on both low and
high pressure sides

Frost on pipe from condenser to
unit
Refrigerant flow obstructed by dirt
in receiverReceiver cloggedReplace condenser

I22120
Condition: Cooling system does not function. (Sometimes it way function)
I22121
Condition: Cooling system does not function effectively.
- HEATER & AIR CONDITIONERREFRIGERANT
55-5
2620 Author
: Date
:
2005 LEXUS ES330 REPAIR MANUAL (RM1124U)
(5) Refrigerant does not circulate
SymptomProbable causeDiagnosisCorrective Actions

Vacuum indicated on low pres-
sure side, very low pressure indi-
cated on high pressure side

Frost or dew seen on piping be-
fore and after receiver/ drier or ex-
pansion valve
Refrigerant flow obstructed by
moisture or dirt in refrigerating sys-
tem

Refrigerant flow obstructed by
gas leaked from expansion valve
Refrigerant does not circulate
(1) Check expansion valve
(2) Clean out dirt in expansion
valve by air blowing
(3) Replace condenser
(4) Evaporate air and supply prop-
er amount of new refrigerant.
(5) For gas leakage from expan-
sion valve, replace expansion
valve
(6) Refrigerant overcharged or insufficient cooling of
condenser
SymptomProbable causeDiagnosisRemedy

Pressure too high on both low
and high pressure sides

No sir bubbles seen through the
sight glass even when the engine
rpm is lowered
Unable to develop sufficient per-
formance due to excessive use of
refrigerating system

Insufficient cooling of condenser

Excessive refrigerant in
cycle"too much refrigerant sup-
plied

Condenser cooling
insufficient"condenser fins
clogged at cooling fan(1) Clean condenser
(2) Check cooling fan with cooling
fan motor operation
(3) If (1) and (2) are in normal
state, check amount of refrigerant
and supply proper amount of re-
frigerant

I22122
Condition: Cooling system does not function.
NOTE : These gauge indica-
tions are shown when the
refrigerating system has
been opens and the refriger-
ant charged without vacuum
purging.
I22123
Condition: Refrigerant functions insufficient. 55-6
- HEATER & AIR CONDITIONERREFRIGERANT
2621 Author
: Date
:
2005 LEXUS ES330 REPAIR MANUAL (RM1124U)
(7) Air present in refrigeration system
SymptomProbable causeDiagnosisCorrective Actions

Pressure too high on both low
and high pressure sides

The low pressure piping too hot
to the touch

Bubbles seen through sight glass
Air entered in refrigerating system

Air present in refrigerating sys-
tem

Insufficient vacuum purging
(1) Check compressor oil to see if
it is see if it is dirty or insufficient
(2) Evacuate air and supply new
refrigerant
(8) Expansion valve improperly
SymptomProbable causeDiagnosisCorrective Actions

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

A85669
TC
CG
A82935
Tester TerminalEngine Wire 14-2
- ENGINE MECHANICALENGINE (3MZ-FE)
2094 Author
: Date
:
2005 LEXUS ES330 REPAIR MANUAL (RM1124U)
(c) When not using the hand-held tester or OBD II scan tool:
(1) Using SST, connect terminals 13 (TC) and 4 (CG)
of the DLC3.
SST 09843-18040
NOTICE:

Make sure of the terminal numbers before connecting
them. Connecting wrong terminals can damage the
engine.

Turn OFF all electrical systems before connecting the
terminals.

Perform this inspection after the cooling fan motor is
turned OFF.
(2) Remove the V-bank cover.
(3) Pull out the engine wire colored by black and red as
shown in the illustration.
(4) Connect the tester terminal of the timing light to the
engine.
NOTICE:
Use a timing light which detects the first signal.
(5) Inspect the ignition timing at idle.
Ignition timing: 8 to 12 BTDC
NOTICE:
When checking the ignition timing, the transmission is in
the neutral position.
HINT:
Run the engine at 1,000 to 1,300 rpm for 5 seconds, then check
that the engine speed returns to the idle speed.
(6) Disconnect terminals 13 (TC) and 4 (CG) of the
DLC3.
(7) Inspect the ignition timing at idle.
Ignition timing: 7 to 24 BTDC
(8) Confirm that the ignition timing advances when the
engine speed is increased.
(9) Remove the timing light.
8. INSPECT ENGINE IDLE SPEED
(a) Warm up the engine.
(b) When using the hand-held tester or OBD II scan tool:
(1) Connect the hand-held tester or OBD II scan tool to the DLC3.
(2) Enter DATA LIST MODE on the hand-held tester or OBD II scan tool.
Idle speed: 630 to 730 rpm
NOTICE:

When checking the idle speed, the transmission is in the neutral position.

Check the idle speed with the cooling fan OFF.

Switch OFF all accessories and air conditioning before connecting the hand-held tester or OBD
II scan tool.
HINT:
Refer to the hand-held tester or OBD II scan tool operator's manual for further details.

160QB-01
A60522
Radiator Cap
Tester
- COOLINGCOOLING SYSTEM (3MZ-FE)
16-1
2279 Author
: Date
:
2005 LEXUS ES330 REPAIR MANUAL (RM1124U)
COOLING SYSTEM (3MZ-FE)
ON-VEHICLE INSPECTION
1. INSPECT COOLING SYSTEM FOR LEAKS
(a) Remove the water outlet cap.
CAUTION:
To avoid the danger of being burned, do not remove the wa-
ter outlet cap while the engine and radiator are still hot.
Thermal expansion will cause hot engine coolant and
steam to blow out from the radiator.
(b) Fill the radiator with coolant, then attach a radiator cap
tester.
(c) Warm up the engine.
(d) Pump it to 118 kPa (1.2 kgf/cm
2, 17.1 psi), then check that
the pressure does not drop.
If the pressure drops, check the hoses, radiator and water
pump for leaks. If there are no signs or traces of external coolant
leaks, check the heater core, cylinder block and head.
(e) Reinstall the water outlet cap.
2. CHECK ENGINE COOLANT LEVEL AT RESERVOIR
(a) The engine coolant should be between the ºLOWº and ºFULLº lines when the engine is cold.
If low, check for leaks and add ºToyota Super Long Life Coolantº or similar high quality ethylene glycol based
non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life hybrid organic acid technology
up to the ºFULLº line.
3. CHECK ENGINE COOLANT QUALITY
(a) Remove the water outlet cap.
CAUTION:
To avoid the danger of being burned, do not remove the water outlet cap while the engine and radiator
are still hot. Thermal expansion will cause hot engine coolant and steam to blow out from the radiator.
(b) Check if there are any excessive deposits of rust or scale around the water outlet cap and water outlet
filler hole; the coolant should free of oil.
If excessively dirty, replace the coolant.
(c) Reinstall the water outlet cap.

A73603
16-2
- COOLINGCOOLING SYSTEM (3MZ-FE)
2280 Author
: Date
:
2005 LEXUS ES330 REPAIR MANUAL (RM1124U)
4. INSPECT FIN BLOCKAGE
(a) If the fins are clogged, wash them with water or a steam
cleaner, then dry with compressed air.
NOTICE:

If the distance between the steam cleaner and core is
too close, there is a possibility of damaging the fins,
so keep the following injection distance.
Injection Pressure
kPa (kgf/cm2, psi)
Injection Distance
mm (in.)
2,942 to 4,903
(30 to 50, 427 to 711)300 (11.811)
4,903 to 7,845
(50 to 80, 711 to 1,138)500 (19.685)

If the fins are bent, straighten them with a screwdriver
or pliers.

Be careful not to expose electronic components to
water.

160QD-01
A86555
A86554
A86556
B09432
- COOLINGCOOLING FAN SYSTEM (3MZ-FE)
16-5
2283 Author
: Date
:
2005 LEXUS ES330 REPAIR MANUAL (RM1124U)
COOLING FAN SYSTEM (3MZ-FE)
ON-VEHICLE INSPECTION
1. CHECK COOLING FAN OPERATION AT LOW TEM-
PERATURE (Below 83
C (181
F))
(a) Turn the ignition switch ON.
(b) Check that the fan and fan No. 2 stops.
If not, check the cooling fan relays and temperature detect
switches.
(c) Disconnect the temperature detect switch connector.
(d) Connect the terminals of the temperature detect switch
wire connector.
(e) Check that the fan rotates at high speed.
If not, check the cooling fan relay and fan.
(f) Reconnect the temperature detect switch connector.
(g) Disconnect the temperature detect switch No. 2 connec-
tor.
(h) Ground the terminal on the temperature detect switch No.
2 wire harness side connector.

A86557
A86558
Ammeter
Battery
A86559
Ammeter
Battery 16-6
- COOLINGCOOLING FAN SYSTEM (3MZ-FE)
2284 Author
: Date
:
2005 LEXUS ES330 REPAIR MANUAL (RM1124U)
(i) Check that the fan and fan No. 2 rotates at low speed.
If not, check the cooling fan relay No. 2, cooling fan relay No.
3 and No. 2 fan.
(j) Reconnect the temperature detect switch No. 2 connec-
tor.
2. INSPECT FAN
(a) Disconnect the fan connector.
(b) Connect battery and ammeter to the fan connector.
(c) Check that the fan rotates smoothly, then check the read-
ing on the ammeter.
Standard amperage: 10.2 to 16.2 A at 20
C (68
F)
(d) Reconnect the fan connector.
3. INSPECT NO. 2 FAN
(a) Disconnect the No. 2 fan connector.
(b) Connect the battery and ammeter to the No. 2 fan con-
nector.
(c) Check that the No. 2 fan rotates smoothly, then check the
reading on the ammeter.
Standard amperage: 10.2 to 16.2 A at 20
C (68
F)
(d) Reconnect the No. 2 fan connector.