Lexus RX300 (MCU15). Service manual — part 83

AC2810

AC1ME–02

AC2811

N11084

Wrong

Okay

HI

LO

HI

LO

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AIR CONDITIONING

AIR CONDITIONING SYSTEM

AC–1

LEXUS RX300 (RM785E)

AIR CONDITIONING SYSTEM

PRECAUTION

1.

DO NOT HANDLE REFRIGERANT IN AN ENCLOSED
AREA OR WEAR A NAKED 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.

AC–2

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AIR CONDITIONING

AIR CONDITIONING SYSTEM

LEXUS RX300 (RM785E)

9.

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

The LEXUS RX300 is equipped with an SRS (Supplemental
Restraint System) such as the driver, front passenger and side
airbag. Failure to carry out service operation in the correct se-
quence could cause the SRS to unexpectedly deploy during
servicing, possibly leading to a serious accident. Before servic-
ing (including removal or installation of parts, inspection or re-
placement), be sure to read the precautionary notices in the RS
section.

AC1MF–02

I07796

Sight Glass

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AIR CONDITIONING

AIR CONDITIONING SYSTEM

AC–3

LEXUS RX300 (RM785E)

ON–VEHICLE INSPECTION

1.

INSPECT REFRIGERANT VOLUME

Observe the sight glass on the liquid tube.
Test conditions:

S

Running engine at 1,500 rpm

S

Blower speed control switch at ”HI” position

S

A/C switch ON

S

Temperature control dial at ”COOL” position

S

Fully open the doors

Item

Symptom

Amount of refrigerant

Remedy

1

Bubbles present in sight glass

Insufficient*

(1) Check for gas leakage with gas leak de-

tector and repair if necessary

(2) Add refrigerant until bubbles disappear

2

No bubbles present in sight glass

None, sufficient or too much

Refer item 3 and 4

3

No temperature difference between com-

pressor inlet and outlet

Empty or nearly empty

(1) Check for gas leakage with gas leak de-

tector and repair if necessary

(2) Add refrigerant until bubbles disappear

4

Temperature between compressor inlet and

outlet is noticeably different

Correct or too much

Refer to items 5 and 6

5

Immediately after air conditioning is turned

off, refrigerant in sight glass stays clear

Too much

(1) Discharge refrigerant

(2) Evacuate air and charge proper amount

of purified refrigerant

6

When air conditioning is turned off, refriger-

ant foams and then stays clear

Correct

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*: Bubbles in the sight glass with ambient temperatures higher than usual can be considered normal if cooling
is sufficient.