Lexus SC300 / Lexus SC400. Manual - part 11

R–12 AIR CONDITIONER SYSTEM RETROFIT – AC001–98

April 3, 1998

Page 4 of 4

E. Replace Receiver

1. Remove original R–12 Receiver

and discard.

2. Measure oil and pour 1/2 of

specified amount of oil into the
“OUT” side of new Receiver (see
table on page 1 for amount).

3. Black out the sight glass on block –

joint – type Receiver with black
paint.

4. Lubricate and install the O–rings on

the Receiver connections.

5. Install Receiver.

F. Using R134a Recovery equipment,

evacuate, charge, and leak test the
system  (Use equipment
manufacturer ’s recommended
procedure).

1. Evacuate for 45 minutes.
2. Vacuum check.
3. If vacuum check is OK, add

remaining 1/2 compressor oil using
the recovery equipment.

S

Using recovery / recycling /
recharging equipment charge
the system with the remaining

½

 of the specified amount of oil

from step E2.

4. Charge system with specified

amount of R134a. (reference table
on page 1).

5. Perform a gas leak check.

G. Confirm cooling performance of Air

Conditioning system.

H. Install retrofit labels:

1. Choose R134a “USE ONLY” label

for proper oil type (

ND–OIL 8

).

2. Using a ball point pen, enter the

proper retrofit refrigerant and oil
charges on the caution label.

3. Cross out unused type of

compressor oil on caution label.

4. Affix labels in a prominent location

such as radiator support, underside
of hood, or suspension tower area.

5. Remove any R–12 labels.

Repair

Procedure
(continued)

FF Type

Black out

Replace O–Rings

Retrofit Receiver

BAG type

Replace O–Ring

Retrofit Receiver

AIR CONDITIONING
SYSTEM

–

AIR CONDITIONING SYSTEM

AC–1

GENERAL DESCRIPTION

REFRIGERATION SYSTEM
Prevention of Refrigerant Release and
Excessive Quantities

Refrigerant (CFCs) for automobile air conditioners is be-
lieved 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 minimum amount when servicing
the air conditioner.

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 ser-
vice valves on the refrigerant line.

3. 

TIGHTEN CONNECTING 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 Description

•

Do not perform repeat evacuation of system

5. 

USE CHARING 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 refrig-
erant.

Handling Precautions for Refrigerant

1. 

DO NOT HANDLE REFRIGERANT IN AN ENCLOSED
AREA OR 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 Description

AC–3