Nissan Frontier. Manual — part 881
HAC-78
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
INSUFFICIENT COOLING
Both High- and Low-pressure Sides are Too High
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
Both high- and low-pressure sides
are too high.
Pressure is reduced soon af-
ter water is splashed on con-
denser.
Excessive refrigerant charge in
refrigeration cycle
Reduce refrigerant until speci-
fied pressure is obtained.
Air suction by cooling fan is in-
sufficient.
Insufficient condenser cooling
performance
↓
1.
Condenser fins are
clogged.
2.
Improper fan rotation of
cooling fan
• Clean condenser.
• Check and repair cooling fan
if necessary.
• Low-pressure pipe is not
cold.
• When compressor is
stopped high-pressure val-
ue quickly drops by approx-
imately 196 kPa (2 kg/cm
2
,
28 psi). It then decreases
gradually thereafter.
Poor heat exchange in con-
denser
(After compressor operation
stops, high-pressure decreas-
es too slowly.)
↓
Air in refrigeration cycle
Evacuate and recharge system.
Engine tends to overheat.
Engine cooling systems mal-
function.
Check and repair engine cool-
ing system.
• An area of the low-pressure
pipe is colder than areas
near the evaporator outlet.
• Plates are sometimes cov-
ered with frost.
• Excessive liquid refrigerant
on low-pressure side
• Excessive refrigerant dis-
charge flow
• Expansion valve is open a lit-
tle compared with the speci-
fication.
↓
Improper expansion valve ad-
justment
Replace expansion valve.
AC359A
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 lo-
cated between compressor
and condenser are clogged or
crushed.
• Check and repair or replace
malfunctioning parts.
• Check oil for contamination.
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 com-
pressor operation stops.
Compressor pressure opera-
tion is improper.
↓
Damaged inside compressor
packings.
Replace compressor.
No temperature difference be-
tween high- and low-pressure
sides.
Compressor pressure opera-
tion is improper.
↓
Damaged inside compressor
packings.
Replace compressor.
AC356A
INSUFFICIENT COOLING
HAC-79
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
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M
A
B
HAC
N
O
P
Both High- and Low-pressure Sides are Too Low
Low-pressure Side Sometimes Becomes Negative
Low-pressure Side 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 liquid
tank outlet and inlet. Outlet
temperature is extremely
low.
• Liquid tank inlet and expan-
sion valve are frosted.
Liquid tank inside is slightly
clogged.
• Replace liquid tank.
• Check oil for contamination.
• Temperature of expansion
valve inlet is extremely low
as compared with areas
near liquid tank.
• Expansion valve inlet may
be frosted.
• Temperature difference oc-
curs somewhere in high-
pressure side.
High-pressure pipe located be-
tween liquid tank and expan-
sion valve is clogged.
• Check and repair malfunc-
tioning parts.
• Check oil for contamination.
Expansion valve and liquid
tank are warm or only cool
when touched.
Low refrigerant charge.
↓
Leaking fittings or compo-
nents.
Check refrigerant system for
leaks. Refer to
HA-20, "Checking of Refriger-
ant Leaks"
There is a big temperature dif-
ference between expansion
valve inlet and outlet while the
valve itself is frosted.
Expansion valve closes a little
compared with the specifica-
tion.
↓
1.
Improper expansion
valve adjustment.
2.
Malfunctioning expansion
valve.
3.
Outlet and inlet may be
clogged.
• Remove foreign particles by
using compressed air.
• Check oil for contamination.
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 oil for contamination.
Air flow volume is too low.
Evaporator is frozen.
• Check intake sensor circuit.
Refer to
.
• Repair evaporator fins.
• Replace evaporator.
• Refer to
Blower Motor Component
Function Check"
AC353A
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
Low-pressure side sometimes be-
comes negative.
• Air conditioning system does
not function and does not cy-
clically cool the compart-
ment air.
• The system constantly func-
tions for a certain period of
time after compressor is
stopped and restarted.
Refrigerant does not discharge
cyclically.
↓
Moisture is frozen at expan-
sion valve outlet and inlet.
↓
Water is mixed with refrigerant.
• Drain water from refrigerant
or replace refrigerant.
• Replace liquid tank.
AC354A
HAC-80
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
INSUFFICIENT COOLING
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 frost-
ed 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 malfunction is caused by
water or foreign particles.
• If water is the cause, initially
cooling is okay. Then the wa-
ter freezes causing a block-
age. Drain water from
refrigerant or replace refrig-
erant.
• If due to foreign particles, re-
move expansion valve and
remove the particles with dry
and compressed air (not
shop air).
• If either of the above meth-
ods cannot correct the mal-
function, replace expansion
valve.
• Replace liquid tank.
• Check oil for contamination.
AC362A
INSUFFICIENT HEATING
HAC-81
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
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INSUFFICIENT HEATING
Component Function Check
INFOID:0000000009478313
SYMPTOM: Insufficient heating
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE
1. Press the AUTO switch.
2. Turn the temperature control dial (driver) clockwise until 32
°C (90°F) is displayed.
3. Check for hot air at discharge air outlets.
Can this symptom be duplicated?
YES
>> GO TO 2.
NO
>> Perform complete system operational check. Refer to
2.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 3.
3.
PERFORM SELF-DIAGNOSIS
Perform self-diagnosis. Refer to
HAC-20, "Front Air Control Self-Diagnosis"
Is the inspection results normal?
YES
>> GO TO 4.
NO
>> Refer to
HAC-20, "Front Air Control Self-Diagnosis Code Chart"
4.
CHECK ENGINE COOLING SYSTEM
1. Check for proper engine coolant level. Refer to
(VQ40DE).
2. Check hoses for leaks or kinks.
3. Check radiator cap. Refer to
(VQ40DE).
4. Check for air in cooling system.
>> GO TO 5.
5.
CHECK AIR MIX DOOR OPERATION
Check the operation of the air mix door.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Check the air mix door motor circuit. Refer to
HAC-26, "Air Mix Door Motor (Driver) Component
6.
CHECK AIR DUCTS
Check for disconnected or leaking air ducts.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair all disconnected or leaking air ducts.
7.
CHECK HEATER HOSE TEMPERATURES
1. Start engine and warm it up to normal operating temperature.
2. Touch both the inlet and outlet heater hoses. The inlet hose should be hot and the outlet hose should be
warm.
Is the inspection result normal?
YES
>> Hot inlet hose and a warm outlet hose: GO TO 8.
NO
>> • Inlet hose cold: GO TO 9.
• Both hoses warm: GO TO 9.
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