Nissan Terrano model r20 series 2004. Manual - part 359

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

Low-pressure side becomes
negative.

AC362A

Liquid tank or front/rear side of
expansion valve’s pipe is
frosted or dewed.

High-pressure side is closed
and refrigerant does not flow.

"

Expansion valve or liquid tank
is frosted.

After the system is left at rest,
start it again in order to con-
firm whether or not problem is
caused by water or foreign
particles.

I

If the problem is due to
water, drain water from
refrigerant or replace refrig-
erant.

I

If it is due to foreign
particles, remove expansion
valve and remove them with
dry and compressed air.

I

If either of the above meth-
ods cannot correct the
problem, replace expansion
valve.

I

Replace liquid tank.

I

Check compressor oil for
contamination.

DIAGNOSES — Overall System

Performance Test Diagnoses (Cont’d)

HA-36

Symptom Chart

DIAGNOSTIC TABLE

PROCEDURE

Prelimi-

nary

Check

Diagnostic
Procedure

Main Power

Supply and

Ground Circuit

Check

Electrical Components Inspection

SYMPTOM

Preliminary

check

1

Preliminary

check

2

Diagnostic

procedure

1

Diagnostic

procedure

2

Diagnostic

procedure

3

15A

Fuses

10A

Fuse

15A

Fuse

Blower

motor

Intake

door

motor

Resistor

A/C

switch

Fan

switch

A/C

relay

Dual-pressure

switch

Compressor

Harness

Magnet

clutch

A/C does not blow cold air.

q

q

q

q

q

q

q

q

q

q

q

q

Blower motor does not rotate.

q

q

q

q

q

q

Magnet clutch does not
engage when A/C switch and
fan switch are ON.

q

q

q

q

q

q

q

q

Noise

Intake door does not change.

q

q

q

,

: The number indicates checking order.

q

: Refer to each flow chart for checking order. (It depends on malfunctioning portion.)

TROUBLE DIAGNOSES

HA-37

Preliminary Check

PRELIMINARY CHECK 1

A/C does not blow cold air.

DOES AIR FLOW FROM VENTS?
Condition

I

Ignition switch, A/C switch, and
fan switch are ON.

I

Mode lever is in VENT mode
and temperature lever is in full
cold position.

OK

E

NG

IS BLOWER MOTOR OPERAT-
ING NORMALLY?

Yes

No

CHECK
BLOWER
MOTOR
OPERATION.
Go to Diagnos-
tic Procedure
1.

CHECK COMPRESSOR BELT TEN-
SION.
Refer to MA section.

NG

OK

F

NG

CHECK COMPRESSOR OPERA-
TION.

OK

CHECK FOR EVAPORATOR COIL
FREEZE UP.
Remove intake unit. Check if
evaporator freezes.

NG

(Freezes up)

OK

(Does not

freeze up)

Adjust or
replace com-
pressor belt.

CHECK REFRIGERATION CYCLE
PRESSURE WITH RECOVERY/
RECYCLING EQUIPMENT CON-
NECTED.
Refer to Performance Chart,
HA-31.

NG

OK

CHECK VENTI-
LATOR DUCT
FOR AIR
LEAKS.

CHECK AMOUNT OF
REFRIGERANT.
Check amount of refrigerant using
ACR4 (Refrigerant recovery &
recharging equipment).

OK

NG

Go to Perfor-
mance Test
Diagnoses.

CHECK THERMO CONTROL
AMP. OPERATION.
Refer to Electrical Components
Inspection, HA-62.

Evacuate sys-
tem and
recharge with
refrigerant.

CHECK FOR
REFRIGERANT
LEAKS.

Go to Diagnostic Procedures 2.

CHECK AIR CONTROL CABLE
ADJUSTMENT.
Refer to Control Linkage
Adjustment, HA-64.

F

OK

CHECK EVAPORATOR OUTLET
AIR TEMPERATURE.
Refer to Performance Chart,
HA-31.

NG

CHECK THERMO CONTROL
AMP. OPERATION.
Refer to Electrical Components
Inspection, HA-62.

H

H

H

H

H

H

H

H

H

H

H

H

H

H

TROUBLE DIAGNOSES

HA-38

PRELIMINARY CHECK 2

Noise

Check where noise
comes from.

Expansion valve

Compressor

Refrigerant line

Belt

Replace expan-
sion valve.

Replace com-
pressor.

The line is fixed directly
to the body.

The line is not fixed.

Fix the line with rubber
or some vibration
absorbing material.

Fix the line tightly.

The belt vibration is
intense.

Side of belt is worn
out.

Readjust belt tension.
Refer to ENGINE MAIN-
TENANCE in MA sec-
tion.

The pulley center
does not match.
Readjust the pulley
center.

H

H

H

H

H

H

H

H

H

H

H

H

H

H

TROUBLE DIAGNOSES

Preliminary Check (Cont’d)

HA-39