Nissan Sentra. Manual

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

RHA273D

PREPARATION

HAC-117

< PREPARATION >

[MANUAL AIR CONDITIONER]

HAC

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

COMPONENT PARTS

HAC-119

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONER]

HAC

Component Description

INFOID:0000000009757723

ECM

IPDM E/R

BCM (view with combination meter
removed)

A/C auto amp. (view with A/C switch
assembly removed)

A/C switch assembly

A/C Compressor

Refrigerant pressure sensor (view
with front bumper fascia removed)

Fuse Block (J/B), Front blower motor
relay

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.

Nissan Sentra. Manual - part 567