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MTC

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AIR CONDITIONER

SECTION
MANUAL AIR CONDITIONER
MTC B

E
CONTENTS
SERVICE INFORMATION ........................... 3
. Wiring Diagram - A/C,M - .......................................33 . F
Front Air Control Terminal and Reference Value ....35
PRECAUTIONS .................................................. 3
. Operational Check ..................................................37 .
Precaution for Supplemental Restraint System Power Supply and Ground Circuit for Front Air G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- Control ....................................................................38
.
SIONER" .................................................................. 3
. LAN System Circuit ................................................40 .
Precaution for Working with HFC-134a (R-134a)...... 3 Mode Door Motor Circuit ........................................42 .
H
Contaminated Refrigerant ........................................ 3 . Air Mix Door Motor Circuit ......................................44 .
General Refrigerant Precaution ............................... 4 . Intake Door Motor Circuit ........................................46 .
Precaution for Leak Detection Dye .......................... 4 . Blower Motor Circuit ...............................................47 .
A/C Identification Label ............................................ 4
. Magnet Clutch Circuit (If Equipped) ........................52 . I
Precaution for Refrigerant Connection ..................... 4 . Insufficient Cooling .................................................55.
Precaution for Service of Compressor ..................... 9 . Insufficient Heating .................................................62.
Precaution for Service Equipment ............................ 9 . Noise ......................................................................63
. MTC
PREPARATION .................................................12
. CONTROL UNIT ................................................ 65
HFC-134a (R-134a) Service Tool and Equipment 12 .... Removal and Installation ........................................65
.
Commercial Service Tool ....................................... 14
. K
FRONT BLOWER MOTOR ............................... 66
REFRIGERATION SYSTEM .............................15
. Removal and Installation ........................................66
.
Refrigerant Cycle ................................................... 15
. L
Refrigerant System Protection ............................... 15 . IN-CABIN MICROFILTER ................................. 67
Component Part Location ...................................... 16. Removal and Installation ........................................67
.

OIL .....................................................................17
. HEATER & COOLING UNIT ASSEMBLY ........ 69 M
Maintenance of Oil Quantity in Compressor .......... 17
. Removal and Installation ........................................69
.

AIR CONDITIONER CONTROL ........................20
. HEATER CORE ................................................. 71
Removal and Installation ........................................71
. N
Overview Air Conditioner LAN Control System ...... 20 .
System Construction .............................................. 20
.
Overview of Control system ................................... 22.
INTAKE DOOR MOTOR ................................... 72
Removal and Installation ........................................72
. O
Control Operation ................................................... 23
.
Discharge Air Flow ................................................. 24
. MODE DOOR MOTOR ...................................... 73
System Description ................................................ 24
. Removal and Installation ........................................73
.
P
TROUBLE DIAGNOSIS ....................................26
. AIR MIX DOOR MOTOR ................................... 74
How to Perform Trouble Diagnosis for Quick and Removal and Installation ........................................74
.
Accurate Repair ..................................................... 26 .
Component Parts and Harness Connector Loca- FAN CONTROL AMPLIFIER ............................ 75
tion ......................................................................... 26
. Removal and Installation ........................................75
.
Schematic .............................................................. 30
.
Wiring Diagram - HEATER - .................................. 31 . DUCTS AND GRILLES ..................................... 76

Revision: October 2008 MTC-1 2009 Sentra
Removal and Installation ....................................... 76
. Removal and Installation for Refrigerant Pressure
Sensor .................................................................... 86
.
REFRIGERANT LINES ..................................... 80
. Removal and Installation for Condenser ................ 87 .
HFC-134a (R-134a) Service Procedure ................ 80 . Removal and Installation for Evaporator ................ 88 .
Component ............................................................ 82
. Removal and Installation for Expansion Valve ....... 89 .
Removal and Installation for Compressor - Checking of Refrigerant Leaks ............................... 89 .
MR20DE ................................................................ 84
. Checking System for Leaks Using the Fluorescent
Removal and Installation for Compressor - Leak Detector ......................................................... 89
.
QR25DE ................................................................ 85
. Dye Injection .......................................................... 90
.
Removal and Installation for Low-Pressure Flexi- Electronic Refrigerant Leak Detector ..................... 90 .
ble Hose and Muffler Pipe ..................................... 85 .
Removal and Installation for High-pressure Flexi- SERVICE DATA AND SPECIFICATIONS
ble Hose ................................................................ 86
. (SDS) ................................................................ 93
.
Removal and Installation for High-pressure Pipe ... 86 Service Data and Specification (SDS) ................... 93
.

Revision: October 2008 MTC-2 2009 Sentra
PRECAUTIONS
< SERVICE INFORMATION >
SERVICE INFORMATION A
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT B
PRE-TENSIONER" INFOID:0000000004786244

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along C
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual.
WARNING: D

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