Lexus SC300 / Lexus SC400. Manual — part 953

SERVICE HINTS FOR REFRIGERANT LEAK DETECTION

Page 2 of 3

B.

Checking for leakage at the evaporator: The evaporator drain hose provides an
excellent access point to check for refrigerant leakage from the evaporator. Be sure
to raise the vehicle on a lift so that the evaporator is as far as possible from any
petrochemical source that may be on the shop floor. When leak checking in this area,
turn the system off, pinch off the evaporator drain hose, and wait 10 to 15 minutes to
allow the refrigerant to accumulate in the evaporator case. When the system is ready
to check, release the drain hose and hold the leak detector wand about 1/4 inch below
the drain opening (see diagram).

NOTE:

Do not allow the leak detector tip to come in contact with water from the
evaporator.

C.

Checking for leakage at front compressor seal: Front compressor seal leaks are

probably the most difficult leaks to detect accurately. Special diagnostic procedures must be followed
for the best success. Make sure the system is fully charged. Operate the system with a pressure gauge
installed and assure that the system has correct system pressures. Shut off the engine. Begin the
leak check by placing the detector probe along the bottom half of the compressor clutch. Move the wand
slowly across the bottom of the compressor clutch. Be careful not to expose the detector wand tip to
any oil residue as this may cause a false leakage reading.

Evaporator

Drain Hose

Verify correct system pressure.

Move dectector wand slowly across the
bottom half of the compressor clutch.

SERVICE HINTS FOR REFRIGERANT LEAK DETECTION

Page 3 of 3

D.

Checking for leakage at service valves or pressure switches:
Small accumulations of refrigerant gas under the service valve caps or pressure switch connectors is
normal. When checking for leaks at these points, use the following procedures to assure the highest
accuracy:

1.

Remove the service valve cap or pressure switch connector.

2.

Allow the service valve or pressure switch to remain uncapped for approximately
20 minutes. This will allow the air to circulate and carry away the accumulated
refrigerant. (This is a good time to leak check other areas of the system).

3.

Do not use compressed air to flush out the service valve or pressure switch
cavity. Petroleum residue from inline oilers or compressor lubrication may cause
false readings.

Some SC 300/SC 400 vehicles may have a sunvisor which falls away slightly from the roof
when placed in the full upright position. To improve visor retention, the position of an internal
clip has been modified in production.

BODY
BO92–004
APRIL 24, 1992
SC 300/SC 400

PART NUMBER INFORMATION:

New Part Number

Prev. Part Number

Description

Side

NOTE:

Before replacing the Sunvisor assembly, ensure that shaft is fully seated into the

sunvisor by pushing the sunvisor further onto the shaft. This may seat the internal clip into
the groove on the shaft.

PRODUCTION EFFECTIVE:

FROM:

November, 1991

VIN:

SC 400: JT8UZ30C9N0011202
SC 300: JT8JZ30C9N0002890

Same

”

”

Same

”

”

Same

”

”

Same

”

”

Medium Gray

Spruce

Ivory

SC 300/SC 400 IMPROVED SUNVISOR HINGE RETENTION (REVISED)

Page 1 of 1

Medium Gray

Spruce

Ivory

Medium Gray

Spruce

Ivory

Medium Gray

Spruce

Ivory

RH

RH

RH

RH w/Sunroof

RH w/Sunroof

RH w/Sunroof

LH

LH

LH

LH w/Sunroof

LH w/Sunroof

LH w/Sunroof

74310–24120–03

74310–24120–07

74310–24120–08

74310–24130–03

74310–24130–07

74310–24130–08

74320–24130–03

74320–24130–07

74320–24130–08

74320–24080–03

74320–24080–07

74320–24080–08

Lexus Supports ASE Certification

Page 1 of 5

Title:

SUSPENSION BALL JOINT INSPECTION

Models:

Applicable Models

Technical Service

Information Bulletin

October 11, 2002

P

G

012-02

This Service Bulletin is to inform you of the inspection method, and free play
specification figures for suspension ball joints. The on–vehicle inspection methods
have been standardized.

S

1990 – 2000 model year LS 400 vehicles.

S

2001 – 2003 model year LS 430 vehicles.

S

1993 – 2003 model year GS 300 vehicles.

S

1998 – 2000 model year GS 400 vehicles.

S

2001 – 2003 model year GS 430 vehicles.

S

1992 – 2000 model year SC 300 & SC 400 vehicles.

S

2002 – 2003 model year SC 430 vehicles.

S

2001 – 2003 model year IS 300 vehicles.

S

1999 – 2003 model year RX 300 vehicles.

S

1990 – 2003 model year ES 250 & ES 300 vehicles.

S

1998 – 2003 model year LX 470 vehicles.

OP CODE

DESCRIPTION

TIME

OFP

T1

T2

N/A

Not Applicable to Warranty

–

–

–

–

PRODUCT GENERAL INFORMA

TION

Introduction

Applicable

Vehicles

Warranty

Information