Nissan Titan. Manual - part 421

REFRIGERATION SYSTEM

HAC-189

< SYSTEM DESCRIPTION >

[MANUAL A/C (TYPE 2)]

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cm

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, 433.6 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into

the atmosphere.

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HAC-190

< SYSTEM DESCRIPTION >

[MANUAL A/C (TYPE 2)]

MANUAL AIR CONDITIONER SYSTEM

MANUAL AIR CONDITIONER SYSTEM

Control System Diagram

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CONTROL SYSTEM

The control system consists of input sensors, switches, the front air control (microcomputer) and outputs.

The relationship of these components is shown in the figure below:

Control System Description

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CONTROL OPERATION

Front air control

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MANUAL AIR CONDITIONER SYSTEM

HAC-191

< SYSTEM DESCRIPTION >

[MANUAL A/C (TYPE 2)]

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TEMPERATURE CONTROL DIAL

Increases or decreases the set temperature.

RECIRCULATION (

) SWITCH

• When REC switch is ON, REC switch indicator turns ON, and air inlet is set to REC.

• When REC switch is turned OFF, or when compressor is turned from ON to OFF, REC switch is automati-

cally turned OFF. REC mode can be re-entered by pressing REC switch again.

• REC switch is not operated when DEF switch is turned ON, at the D/F position, or in floor position.

DEFROSTER (

) SWITCH

Positions the air outlet doors to the defrost position. Also positions the intake doors to the outside air position,

and turns A/C compressor ON.

REAR WINDOW DEFOGGER SWITCH (IF EQUIPPED)

When switch is ON, rear window and door mirrors are defogged.

BLOWER CONTROL DIAL/OFF SWITCH

• The blower speed is manually controlled with this dial.

• The compressor and blower are OFF, the intake doors are set to the outside air position, and the air outlet

doors are set to the foot position.

A/C SWITCH

The compressor is ON or OFF.

(Pressing the A/C switch when the AUTO switch is ON will turn off the A/C switch and compressor.)

MODE CONTROL DIAL

Controls the air discharge outlets.

MAGNET CLUTCH CONTROL

When A/C switch or DEF switch is pressed, front air control inputs compressor ON signal to BCM.

BCM sends compressor ON signal to ECM and front air control, via CAN communication line.

ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant pressure sen-

sor signal, throttle angle sensor, etc.). If it judges compressor can be turned ON, it sends compressor ON sig-

nal to IPDM E/R, via CAN communication line.

Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate com-

pressor.

Discharge Air Flow

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HAC-192

< SYSTEM DESCRIPTION >

[MANUAL A/C (TYPE 2)]

MANUAL AIR CONDITIONER SYSTEM

Switches And Their Control Function

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Mode door position

Air outlet/distribution

Vent

Foot

Defroster

95%

5%

—

60%

40%

—

—

70%

30%

—

60%

40%

—

10%

90%

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