Nissan Sentra. Manual — part 567
HAC-116
< PRECAUTION >
[MANUAL AIR CONDITIONER]
PRECAUTIONS
Be certain that the service hoses display the markings described
(colored hose with black stripe). All hoses must include positive shut-
off devices (either manual or automatic) near the end of the hoses
opposite the manifold gauge.
SERVICE COUPLERS
Do not attempt to connect HFC-134a (R-134a) service couplers to a
CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will
not properly connect to the CFC-12 (R-12) system. However, if an
improper connection is attempted, discharging and contamination
may occur.
RHA272D
Shut-off valve rotation
A/C service valve
Clockwise
Open
Counterclockwise
Close
RHA273D
PREPARATION
HAC-117
< PREPARATION >
[MANUAL AIR CONDITIONER]
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PREPARATION
PREPARATION
Special Service Tool
INFOID:0000000009757720
The actual shape of the tools may differ from those illustrated here.
Commercial Service Tool
INFOID:0000000009757721
Tool number
(TechMate No.)
Tool name
Description
—
(J-46534)
Trim Tool Set
Removing trim components
AWJIA0483ZZ
Tool name
Description
Power tool
Loosening nuts, screws and bolts
PIIB1407E
HAC-118
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONER]
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Part Location
INFOID:0000000009757722
ALIIA0705ZZ
COMPONENT PARTS
HAC-119
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONER]
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Component Description
INFOID:0000000009757723
1.
ECM
2.
IPDM E/R
3.
BCM (view with combination meter
removed)
4.
A/C auto amp. (view with A/C switch
assembly removed)
5.
A/C switch assembly
6.
A/C Compressor
7.
Refrigerant pressure sensor (view
with front bumper fascia removed)
8.
Fuse Block (J/B), Front blower motor
relay
9.
Blower motor (view with front A/C
assembly removed from vehicle)
10. Mode door motor
11. Intake door motor
12. Air mix door motor
13. Intake sensor
14. Variable blower control
ALIIA0706ZZ
Component
Description
A/C auto amp.
A/C auto amp. controls front automatic air conditioning system by inputting and calculating signals
from each sensor and each switch.
A/C Compressor
Vaporized refrigerant is drawn into the A/C compressor from the evaporator, where it is compressed
to a high pressure, high temperature vapor. The hot, compressed vapor is then discharged to the con-
denser.
A/C switch assembly
The A/C switch assembly controls the operation of the A/C and heating system based on inputs from
the temperature control knob, the mode switches, the blower control dial, the ambient temperature
sensor, the intake sensor, and inputs received from the ECM across the CAN. Diagnosis of the A/C
switch assembly can be performed using the CONSULT. There is no self-diagnostic feature available.
Air mix door motor
The air mix door controls the mix of hot or cold air that enters the ventilation system. It is controlled
by the A/C auto amp. based on the position of the temperature dial. The air mix door motor LH re-
ceives position commands from the A/C auto amp.
BCM
The BCM receives the fan ON and A/C ON signals from the A/C auto amp. and sends a compressor
ON request to the ECM.
Blower motor
The blower motor varies the speed at which the air flows through the ventilation system.
ECM
The ECM sends a compressor ON request to the IPDM E/R based on the status of engine operation
and load as well as refrigerant pressure information. If all the conditions are met for A/C operation,
the ECM transmits the compressor ON request to the IPDM E/R.
Blower motor relay
The blower motor relay controls the flow of current to fuse 20, 21 and 22 in the Fuse Block (J/B). The
relay is connected directly to ground, and is energized when the ignition switch is in the ON or START
position.
Fuse Block (J/B)
Located in the passenger compartment, behind the left lower IP, the Fuse Block (J/B) contains the
front blower motor relay and several fuses required for the air conditioner control system.
Intake door motor
The intake door motor controls the position of the intake door. Fresh air is allowed to enter the cabin
in one position, and recirculated inside air is allowed to enter in the other position. The intake door
motor receives position commands from the A/C auto amp.
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