Nissan Frontier D22. Instruction — part 833

MTC-54

TROUBLE DIAGNOSIS

High-Pressure Side is Too High and Low-Pressure Side is Too Low.

High-Pressure Side is Too Low and Low-Pressure Side is Too High.

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

High-pressure side is too high and
low-pressure side is too low.

Upper side of condenser and
high-pressure side are hot,
however, liquid tank is not so
hot.

High-pressure tube or parts
located between compressor
and condenser are clogged or
crushed.

●

Check and repair or replace
malfunctioning parts.

●

Check lubricant for contami-
nation.

AC360A

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

High-pressure side is too low and
low-pressure side is too high.

High and low-pressure sides
become equal soon after
compressor operation stops.

Compressor pressure opera-
tion is improper.

↓

Damaged inside compressor
packings

Replace compressor.

No temperature difference
between high and low-pres-
sure sides

Compressor pressure opera-
tion is improper.

↓

Damaged inside compressor
packings.

Replace compressor.

AC356A

TROUBLE DIAGNOSIS

MTC-55

C

D

E

F

G

H

I

K

L

M

A

B

MTC

Both High- and Low-Pressure Sides are Too Low.

Low-Pressure Side Sometimes Becomes Negative.

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

Both high- and low-pressure sides
are too low.

●

There is a big temperature
difference between receiver
drier outlet and inlet. Outlet
temperature is extremely
low.

●

Liquid tank inlet and expan-
sion valve are frosted.

Compressor discharge capac-
ity does not change. (Com-
pressor stroke is set at
maximum.)

●

Replace liquid tank.

●

Check lubricant for contami-
nation.

●

Temperature of expansion
valve inlet is extremely low
as compared with areas
near liquid tank.

●

Expansion valve inlet may
be frosted.

●

Temperature difference
occurs somewhere in high-
pressure side

High-pressure pipe located
between receiver drier and
expansion valve is clogged.

●

Check and repair malfunc-
tioning parts.

●

Check lubricant for contami-
nation.

●

Expansion valve and liquid
tank are warm or only cool
when touched.

Low refrigerant charge

↓

Leaking fittings or compo-
nents

Check refrigerant for leaks.
Refer to

MTC-72, "Checking

for Refrigerant Leaks"

.

There is a big temperature dif-
ference between expansion
valve inlet and outlet while the
valve itself is frosted.

Expansion valve closes a lit-
tle compared with the specifi-
cation.

↓

1. Improper expansion valve

adjustment

2. Malfunctioning thermal

valve

3. Outlet and inlet may be

clogged.

●

Remove foreign particles by
using compressed air.

●

Check lubricant for contami-
nation.

An area of the low-pressure
pipe is colder than areas near
the evaporator outlet.

Low-pressure pipe is clogged
or crushed.

●

Check and repair malfunc-
tioning parts.

●

Check lubricant for contami-
nation.

Air flow volume is not enough
or is too low.

Evaporator is frozen.

↓

Compressor discharge capac-
ity does not change. (Com-
pressor stroke is set at
maximum length.)

●

Check intake sesor opera-
tion. Refer to

MTC-60,

"Intake Sensor"

.

●

Replace compressor.

AC353A

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

Low-pressure side sometimes
becomes negative.

●

Air conditioning system
does not function and does
not cyclically cool the com-
partment air.

●

The system constantly func-
tions for a certain period of
time after compressor is
stopped and restarted.

Refrigerant does not dis-
charge cyclically.

↓

Moisture is frozen at expan-
sion valve outlet and inlet.

↓

Water is mixed with refriger-
ant.

●

Drain water from refriger-
ant or replace refrigerant.

●

Replace liquid tank.

AC354A

MTC-56

TROUBLE DIAGNOSIS

Low-Pressure Side Becomes Negative.

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

Low-pressure side becomes nega-
tive.

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.

Leave the system at rest until
no frost is present. Start it
again to check whether or not
the problem is caused by
water or foreign particles.

●

If water is the cause, initially
cooling is okay. Then the
water freezes causing a
blockage. Drain water from
refrigerant or replace refrig-
erant.

●

If due to foreign particles,
remove expansion valve
and remove particles with
dry and compressed air (not
shop air).

●

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

●

Replace liquid tank.

●

Check lubricant for contami-
nation.

AC362A

TROUBLE DIAGNOSIS

MTC-57

C

D

E

F

G

H

I

K

L

M

A

B

MTC

Insufficient Heating

EJS0020C

TROUBLE DIAGNOSIS PROCEDURE FOR INSUFFICIENT HEATING

Symptom:

●

Insufficient heating

Inspection Flow

WJIA0283E

*1:

MTC-58

*2:

MTC-30

*3:

MTC-22

*4:

CO-13

(KA24DE models) or

CO-28

(VG33E and VG33ER models)

*5:

MA-16

(KA24DE models) or

MA-26

(VG33E and VG33ER models)

*6:

MTC-63

*7

CO-8

(KA24DE models) or

CO-23

(VG33E and VG33ER models)