Mitsubishi Montero 1987 Service Manual Page 277
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- TROUBLESHOOTING
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AIR-CONDITIONING -Service Adjustment Procedures
24-41
COMPRESSOR NOISE
NWLM
When investigating an air conditioning related noise, you must first know the conditions when the noise occurs.
These conditions are: weather, vehicle speed, in gear or neutral, engine temperature or any other special
conditions.
Noises that develop during air- conditioning operation can often be misleading. For example: what sounds like a
failed front bearing or connecting rod, may be caused by loose bolts, nuts, mounting brackets, or a loose clutch
assembly. Verify accessory drive belt tension (power
steering,
alternator or air pump). Improper accessory drive belt
tension can cause a misleading noise when the compressor is engaged and little or no noise when the compressor
is disengaged.
Drive belts are speed sensitive. That is, at different engine speeds, and depending upon belt tension, belts can
develop unusual noises that are often mistaken for mechanical problems within the compressor.
Adjustment
Procedures
(1) Select a quiet area for testing. Duplicate conditions as much as possible. Switch compressor on and off several
times to clearly identify compressor noise.
To duplicate high ambient conditions (high head pressure), restrict air-flow through
condenser. Install
manifold gauge set to make sure discharge pressure does not exceed 2,070 kPa (300 psi).
(2) Tighten all compressor mounting bolts, clutch mounting bolt, and compressor drive belt. Check to assure clutch
coil is tight (no rotation or wobble).
(3) Check refrigerant hoses for rubbing or interference that can cause unusual noises.
(4) Check refrigerant charge (See “Charging the System”).
(5) Recheck compressor noise as in Step 1.
(6) If noise still exists, loosen compressor mounting bolts and retorque. Repeat Step 1.
(7) If noise continues, replace compressor and repeat Step 1.
1 STB Revision
- MONTERO 1
- HOW TO USE THIS MANUAL 2
- INTRODUCTION 3
- VEHlCLE IDENTIFICATION 4
- FEDERAL 5
- ) STB Revision 5
- CHASSIS 6
- ENGINE MODEL STAMPING 6
- BODY COLOR CODE 7
- PRECAUTIONS BEFORE SERVICE 8
- WIRING HARNESSES 9
- INTRODUCTION 10
- ELECTRICAL COMPONENTS 11
- FUSES AND FUSIBLE LINKS 11
- Precautions Before Service 12
- 1 STB Revision 12
- RADIO EQUIPMW& 13
- TOWING AND HOISTING 14
- INTRODUCTION - Towing 15
- Hoisting 15
- HOISTING 15
- Towitng 16
- TIGHTENING TORQUE 19
- ELECTRICAL 21
- RELAY AND CONTROL UNIT 22
- Control Unit 23
- Revision 24
- - Diode 25
- FUSIBLE LINK AND FUSE 26
- GROUNDING 27
- 5. :. 28
- INSPECTION OF HARNESS 29
- CONNECTOR 29
- ROUND WATERPROOF CONNECTOR 30
- INJECTOR CONNECTOR 31
- 16R132i 32
- WIRING HARNESS 33
- CHECKING SWITCHES 35
- . . . I 36
- CHECKING FUSES 37
- CHECKING CABLES AND WIRES 38
- 1680241 39
- 1680242 39
- WIRING HARNESS 40
- IDENTIFYING CONNECTORS 45
- I Y I 46
- OVERALL WIRING DIAGRAM 47
- 1 ENGINE COMPARTMENT 48
- ,I I I, I / 49
- 2 INTERIOR AND FRAIVIE 50
- STB Revision 51
- “3’ ‘ 52
- 2 IGNITION CIRCUIT 56
- 3 CHARGING CIRCUIT 57
- I L uA-2i 58
- 1 I ! ! 59
- OFCOMPONENJS 60
- RG RI. G 65
- 8 DOME LIGHT CIRCUIT 67
- I- I 68
- IO STOP LIGHT CIRCUIT 70
- _-- -_ I- r 72
- > El 73
- HARNESS 74
- Circuit 78
- LY!ii!T 83
- 20 POWER WINDOW CIRCUIT 84
- 04 2-L 85
- 21 BUZZER CIRCUIT 86
- FREE-WHEELING HUB 87
- INDICATOR SYSTFM 87
- CENTRALIZED JUNCTION 89
- Multi-purpose Fuse 90
- Test indicator 92
- CHARGING SYSTEM 100
- Service 101
- INSPECTION OF BATTERY 101
- BATTERY CHARGING 102
- ALTERNATOR 103
- CHARGING 104
- SERVICE POINTS 105
- . . 107
- CHARGING SYSPE 109
- STARTING SYSTEM 111
- GENERAL INFORMATION 111
- 1 ST6 Revision 112
- SPECIFICATIONS 113
- TROUBLESHOOTING 114
- 1 STARTING CIRCUIT 115
- STARTER MOTOR 117
- WEEM -Starter Motor 119
- DISASSEMBLY AND REASSEMBLY 120
- INSPECTION 121
- STARTING SYSTEM-Starter 122
- STARTING 123
- IGNITION SYSTEM 125
- IISTRIBUTOR 126
- IGNITER OPERATION 126
- SERVICE SPECIFICATIONS 128
- TORQUE SPECIFICATIONS 128
- 2 IGNITDN CIRCUIT 130
- CHECKING IGNITION TIMING 131
- CHECKING IGNITION SYSTEM 131
- IGNITION SYSTEM 132
- SPARK PLUG CABLE TEST 132
- SPARK PLUG TIEST 132
- Secondary cable 133
- 5-10 km 133
- (.2-.4 in.) 133
- SERVICE POINTS OF REMOVAL 135
- 01R0234 136
- ( STB Revision 137
- DISTRIBUTOR 139
- IGNITION SYSTEM-Distributor 141
- IGNITION SWITCH 142
- METERS AND GAUGES 143
- WATER TEMPERATURE GAUGE 146
- OIL PRESSURE GAUGE 146
- BRAKE WARNING LIGHT 147
- EGR WARNING LIGHT 147
- CIRCUIT DIAGRAM 148
- METER CIRCUIT 148
- I I 1 149
- BJUSTMENT. PROCEDURES 150
- FUEL GAUGE SIMPLE TEST 151
- NOBHIKD 152
- NOEHIFA 152
- VOLTAGE METER SIMPLE TEST 153
- COMBINATION METER 154
- 3-METER lJN(IT 157
- INCLINOMETER 159
- AND GAUGES 160
- INDICATORS AND WARNING 161
- EGR WARNING SYSTEM 162
- LIGHTING SYSTEM 163
- 1 Symptom \ 165
- BACK-UP LIGHT 166
- DOME LIGHT 167
- LIGHTING 168
- HEADLIGHT CIRCUIT m 169
- I I I ’ I 172
- I v-l--c 173
- STOP LIGHT CIRCUIT 175
- E ADJUSTMENT PROCEDURES 177
- T AIMING 177
- HEADLIGHT 178
- COLUMN SWITCH 179
- Termina’ 180
- HAZARD WARNING 181
- DIMMER CONTROL SWITCH 182
- WIPER AND WASHER SYSETM 183
- REAR WIPER AND WASHER 184
- SPECIAL TOOLS 185
- WIPER AND WASHER SYSTEM 187
- HEADLIGHT WASHER 187
- WIPER AND WASHER CIRCU 188
- ADJUSTMENT PROCEDURES 190
- WINDSHIELD WIPE 191
- WIPER AND WAsHER SYSTEM 192
- REAR WIPtER 194
- 16K394 1 195
- ::I:;rl _ 197
- REAR WASHER 198
- HEADLIGHT WASHER RELAY 200
- REMOVAL AND INSTALLATION 203
- I r t 205
- HORN - Horn 206
- HORN ADJUSTMENT 206
- HORN SWITCH 207
- ACCESSORY 208
- CIGARETTE LIGHTER 210
- ACCESSORY 211
- AUDIO SYSTEM 212
- NOISE SOURCES 213
- It, /II 214
- ANTkNNA TRUMMER 216
- RADIO AND TAPE PLAYER 217
- FRONT SPEAKER 218
- REAR SPEAKER 218
- ANTENNA 219
- NOISE SWPRESSION 220
- NOISE SUPPRESOR 222
- BACK DOOR WINDOW DEFOGGER 223
- CIRCUIT DUAGRAM 225
- DEFOGGER CIRCUIT -t IDI L 225
- \ A w 226
- PRINTED HEATER LINES 227
- GENERAL INFORMATION ’ 228
- Time-----w 229
- - General Information 230
- PULSE GENERATOR 231
- VU6 INDICATOR SYSTEM 234
- AIR-CO IONING 237
- HEATERS 241
- WAiER VALVE REPLACEMENT 244
- Heater Control 245
- HEATER CONTROL 245
- HEATER UNBT 248
- N241EAD 249
- BLOWER ASSEMBLY 250
- INSPECT00 251
- VENTILATORS 252
- 'f------A 254
- GENERAL 255
- N24BBBB 256
- 24-2 1 257
- AIR-CONDITIONING 261
- “yl lLG1 262
- SAFETY PRECAUTIONS 264
- AIR-CONDITIONING-Service 267
- 2ouo319 268
- TESTING SYSTEM FOR LEAKS 269
- PEAFORMANCE TEST 270
- Adjustment Procedures 272
- 2OUO326 273
- (22 Ibs.1 Compressor 276
- COMPRESSOR NOISE 277
- Adjustment 277
- AIR CONDITIONER SWITCH 278
- EVAPORATOR 279
- AIR-CONDOTIONING-Evaporator 280
- COMPRESSOR 282
- ,: 24-48 284
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