
MTC-1
AIR CONDITIONER
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CONTENTS
MANUAL AIR CONDITIONER
SERVICE INFORMATION .. ..........................3
PRECAUTIONS .............................................. .....3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
3
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ............................... ......
3
Precaution for Procedure without Cowl Top Cover ......4
Precaution for Working with HFC-134a (R-134a) ......4
General Refrigerant Precaution ................................4
Oil Precaution ............................................................5
Precaution for Refrigerant Connection ......................5
Precaution for Service of Compressor ................ ......7
Precaution for Service Equipment ....................... ......8
Precaution for Leak Detection Dye ...........................9
PREPARATION ..................................................11
HFC-134a (R-134a) Service Tool and Equipment ....11
Commercial Service Tool ........................................14
REFRIGERATION SYSTEM ..............................15
Refrigerant Cycle ................................................ ....15
Refrigerant System Protection ................................15
Component Part Location ................................... ....16
OIL ......................................................................17
Maintenance of Oil Quantity in Compressor ....... ....17
AIR CONDITIONER CONTROL .........................19
Control Operation ................................................ ....19
Discharge Air Flow ..................................................20
System Description .................................................20
TROUBLE DIAGNOSIS .....................................22
CONSULT-III Function (BCM) ............................. ....22
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ......................................................
23
Component Parts and Harness Connector Loca-
tion ...................................................................... ....
23
Schematic ...............................................................26
Wiring Diagram - Heater - .......................................27
Wiring Diagram - A/C,M - .................................... ....28
Operational Check ...................................................31
Mode Door ...............................................................32
Air Mix Door .............................................................33
Intake Door ..............................................................34
Front Blower Motor Circuit .......................................34
Magnet Clutch Circuit (If Equipped) ..................... ....38
Insufficient Cooling ..................................................46
Insufficient Heating ..................................................53
Noise .......................................................................54
CONTROLLER ..................................................56
Removal and Installation .........................................56
Disassembly and Assembly .....................................57
THERMO CONTROL AMPLIFIER ....................58
Removal and Installation .........................................58
A/C UNIT ASSEMBLY ......................................59
Removal and Installation .........................................59
Disassembly and Assembly .....................................61
BLOWER MOTOR ............................................63
Removal and Installation .........................................63
INTAKE DOOR ..................................................64
Intake Door Cable Adjustment .................................64
AIR MIX DOOR .................................................65
Air Mix Door Cable Adjustment ...............................65
MODE DOOR ....................................................66
Mode Door Cable Adjustment .................................66
BLOWER FAN RESISTOR ...............................67
Removal and Installation .........................................67
HEATER CORE .................................................68
Removal and Installation .........................................68
AIR CONDITIONER FILTER .............................69
Removal and Installation .........................................69
Revision: January 20102010 Versa

MTC-32
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
1. Turn blower control dial clockwise to "1" position. Blower should operate on low speed.
2. Turn blower control dial clockwise to "2" position, and continue checking blower speed until all speeds are
checked.
3. Leave blower on Maximum speed.
If NG, go to trouble diagnosis procedure for MTC-34, "
Front Blower Motor Circuit".
If OK, continue the check.
CHECKING DISCHARGE AIR
1. Turn mode door control dial to each position.
2. Confirm that discharge air comes out according to the air distribution table. Refer to MTC-20, "
Discharge
Air Flow".
If NG, go to trouble diagnosis procedure for MTC-32, "
Mode Door".
If OK, continue the check.
CHECKING RECIRCULATION
1. Set intake door lever to REC position.
2. Operate intake door lever to FRE position.
3. Listen for intake door position change (you should hear blower sound change slightly).
If NG, go to trouble diagnosis procedure for MTC-34, "
Intake Door".
If OK, continue the check.
CHECKING TEMPERATURE DECREASE
1. Turn temperature control dial counterclockwise to full cold position.
2. Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for MTC-46, "
Insufficient Cooling".
If OK, continue the check.
CHECKING TEMPERATURE INCREASE
1. Turn temperature control dial clockwise to full hot position.
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for MTC-53, "
Insufficient Heating".
If OK, continue the check.
CHECKING A/C SWITCH (IF EQUIPPED)
1. Turn fan control dial to the desired (1 to 4 speed) position.
2. Press A/C switch.
3. A/C switch indicator will turn ON.
• Confirm that the compressor clutch engages (sound or visual inspection).
If NG, go to trouble diagnosis procedure for MTC-38, "
Magnet Clutch Circuit (If Equipped)".
If OK, continue the check.
CHECKING DEFROST A/C SWITCH (IF EQUIPPED)
1. Turn fan control dial to the desired (1 to 4 speed) position.
2. Turn mode dial to ( ) DEF.
3. Confirm that the compressor clutch engages (sound or visual inspection) and the A/C switch indicator illu- minates.
If NG, go to trouble diagnosis procedure for MTC-38, "
Magnet Clutch Circuit (If Equipped)".
If all operational checks are OK (symptom cannot be duplicated), go to MTC-23, "
How to Perform Trouble
Diagnosis for Quick and Accurate Repair" and perform tests as outlined. If symptom appears, refer to MTC-23,
"How to Perform Trouble Diagnosis for Quick and Accurate Repair" and perform applicable trouble diagnosis
procedures.
Mode DoorINFOID:0000000005396498
SYMPTOM: Air outlet does not change.
INSPECTION FLOW
Revision: January 20102010 Versa

TROUBLE DIAGNOSISMTC-33
< SERVICE INFORMATION >
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1.CONFIRM SYMPTOM BY PERFORMING O PERATIONAL CHECK - DISCHARGE AIR
1. Rotate the mode door control dial to each position.
2. Confirm that discharge air comes out accord ing to the air distribution table. Refer to MTC-20, "
Discharge
Air Flow".
NOTE:
Confirm that the compressor clutch (with A/C) is engaged (visual inspection) when DEF ( ) or D/F ( )
is selected.
Can a symptom be duplicated?
YES >> GO TO 3.
NO >> GO TO 2.
2.PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to MTC-31, "
Operational Check".
Can a symptom be duplicated?
YES >> Refer to MTC-23, "How to Perform Trouble Diagnosis for Quick and Accurate Repair".
NO >> System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.CHECK MODE DOOR CONTROL CABLE
Check and verify mode door mechanism for smooth operation in each mode.
OK or NG
OK >> If the symptom still exists, perform a comple te operational check and check for other symptoms.
Refer to MTC-31, "
Operational Check". If other symptoms exist, refer to MTC-23, "How to Perform
Trouble Diagnosis for Quick and Accurate Repair" .
NG >> Repair or adjust mode door control cable. Refer to MTC-66, "
Mode Door Cable Adjustment".
Air Mix DoorINFOID:0000000005396499
SYMPTOM: Air mix door does not change.
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE
1. Turn the temperature control dial clockwise until maximum heat.
2. Check for hot air at discharge air outlets.
>> GO TO 2.
2.CONFIRM SYMPTOM BY PERFORMING OPERAT IONAL CHECK - TEMPERATURE DECREASE
1. Turn the temperature control dial counterclockwise until maximum cold.
2. Check for cold air at discharge air outlets.
Can a symptom be duplicated?
YES >> GO TO 4.
NO >> GO TO 3.
3.PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to MTC-31, "
Operational Check".
Can a symptom be duplicated?
YES >> Refer to MTC-23, "How to Perform Trouble Diagnosis for Quick and Accurate Repair".
NO >> System OK.
4.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
Revision: January 20102010 Versa