1991 LEXUS SC400 Service Repair Manual

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Page 137 of 4087

LEXUS SC400 1991 Service Repair Manual No.Gauge reading kPa (kgf/cm2, psi)ConditionProbable cause Remedy LO: 1.5 ± 2.0(21 ±28, 147 ±196) HI: 14.5 ± 15.0(206 ±213, 1422 ±1471) Normal coolingNormally functioning system During operati

Page 138 of 4087

LEXUS SC400 1991 Service Repair Manual No.Gauge reading kPa (kgf/cm2, psi)ConditionProbable causeRemedy Pressure low at both low and high pressure sides Pressure too high at both low and high pressure sides Insufficient cooling Bubbles

Page 139 of 4087

LEXUS SC400 1991 Service Repair Manual No.Gauge reading kPa (kgf/cm2, psi)ConditionProbable causeRemedy Vacuum indicated at low pressure side, very low pressure indicated at high pressure. Pressure too high at low pressure sides, pressure

Page 140 of 4087

LEXUS SC400 1991 Service Repair Manual REFRIGERANT VOLUME INSPECTION OF REFRIGERANT VOLUME 1. RUN ENGINE AT IDLE SPEED 2. OPERATE A/C AT MAXIMUM COOLING FOR A FEWMINUTES 3. INSPECT AMOUNT OF REFRIGERANT Observe the sight glass on the l

Page 141 of 4087

LEXUS SC400 1991 Service Repair Manual DRIVE BELT TENSION INSPECTION OF DRIVE BELT TENSION 1. INSPECT DRIVE BELTS INSTALLATION CONDITIONCheck that the drive belt fits properly in the ribbed grooves. 2. INSPECT DRIVE BELT TENSION Check

Page 142 of 4087

LEXUS SC400 1991 Service Repair Manual REFRIGERANT LINES TIGHTENING TORQUE OF REFRIGERANT LINES ON±VEHICLE INSPECTION 1. INSPECT HOSES AND TUBES FOR LEAKAGEUse a gas leak tester. Replace if necessary. 2. INSPECT HOSE AND TUBE CONNECTIO

Page 143 of 4087

LEXUS SC400 1991 Service Repair Manual REPLACEMENT OF REFRIGERANT LINES 1. RECOVER REFRIGERANT IN REFRIGERATION SYSTEMSee page AC±16 2. REPLACE FAULTY TUBE OR HOSE NOTICE: To prevent the intrusion of moisture or dirt, caps should be p

Page 144 of 4087

LEXUS SC400 1991 Service Repair Manual A/C UNIT REMOVAL OF A/C UNIT 1. RECOVER REFRIGERANT IN SYSTEMSee page AC±16 2. REMOVE ENGINE See page EM±118 3. REMOVE WATER VALVE See page AC±127 4. REMOVE BRAKE TUBES BRACKET MOUNTING BOLTS
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