1991 LEXUS SC400 Service Repair Manual

Page 41 of 4087

LEXUS SC400 1991  Service Repair Manual 
R±12 AIR CONDITIONER SYSTEM RETROFIT ± AC001±98 April 3, 1998
Page 4 of 4
E. Replace Receiver
1. Remove original R±12 Receiverand discard.
2. Measure oil and pour 1/2 of specified amount of oil i

Page 42 of 4087

LEXUS SC400 1991  Service Repair Manual 
AIR CONDITIONING
SYSTEM
±
AIR CONDITIONING SYSTEMAC±1 
WhereEverybodyKnowsYourName

Page 43 of 4087

LEXUS SC400 1991  Service Repair Manual 
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 oz

Page 44 of 4087

LEXUS SC400 1991  Service Repair Manual 
wDo 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 cha

Page 45 of 4087

LEXUS SC400 1991  Service Repair Manual 
Handling Precautions for Gas±Cylinder
Type Gas Leak Tester
1.  BEFORE USING TESTER MAKE SURE THAT THEREARE NO FLAMMABLE SUBSTANCES NEARBY
2.  BE CAREFUL NOT TO INHALE POISONOUS GAS If refrigerant ga

Page 46 of 4087

LEXUS SC400 1991  Service Repair Manual 
wTighten the O±ring fittings or the bolted type fittings to
the specified torque.
Precautions When Charging Refrigerant
1.  DO NOT OPERATE COMPRESSOR WITHOUT ENOUGH
REFRIGERANT IN REFRIGERANT CYCLE

Page 47 of 4087

LEXUS SC400 1991  Service Repair Manual 
DESCRIPTION
FEATURES
The microprocessor controlled automatic air conditioner is a system whic\
h controls the the cabin air conditioning
automatically  using a microcomputer.
The microcomputer senses

Page 48 of 4087

LEXUS SC400 1991  Service Repair Manual 
PARTS LOCATION (Contd)
±
AIR CONDITIONING SYSTEM DescriptionAC±7 
WhereEverybodyKnowsYourName