Nissan Rogue. Manual - part 737

HA-16

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORKFLOW

>> GO TO 2.

2.

SYMPTOM CHECK

Verify symptoms.

>> GO TO 3.

3.

CHECK FOR DTCS

With CONSULT

1. Turn ignition switch ON.

2. Select “Self Diagnostic Result” of “HVAC”.

3. Check DTC.
Is any DTC detected?

YES

>> GO TO 4.

NO

>> GO TO 5.

4.

PERFORM DTC DIAGNOSTIC PROCEDURE

Perform the diagnostic procedure for the detected DTC. Refer to 

HAC-32, "DTC Inspection Priority Chart"

(automatic A/C) or 

HAC-135, "DTC Inspection Priority Chart"

 (manual A/C).

>> GO TO 7.

5.

OPERATION CHECK

Perform the operation check. Refer to 

HAC-48, "Work Procedure"

 (automatic A/C) or 

HAC-149, "Work Proce-

dure"

 (manual A/C).

>> GO TO 6.

6.

SYMPTOM DIAGNOSIS

Check the symptom diagnosis table. Refer to 

HAC-96, "Diagnosis Chart By Symptom"

 (automatic A/C) or

HAC-175, "Symptom Table"

 (manual A/C).

>> GO TO 8.

7.

VERIFY REPAIR.

With CONSULT

1. Turn ignition switch ON.

2. Select “Self Diagnostic Result” of “HVAC”.

3. Check DTC.
Is any DTC detected?

YES

>> GO TO 4.

NO

>> GO TO 8.

8.

PERFORM FINAL OPERATION CHECK

Perform the operation check. Refer to 

HAC-48, "Work Procedure"

 (automatic A/C) or 

HAC-149, "Work Proce-

dure"

 (manual A/C).

Does it operate normally?

YES

>> Inspection End.

NO

>> GO TO 2.

REFRIGERATION SYSTEM SYMPTOMS

HA-17

< SYMPTOM DIAGNOSIS >

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SYMPTOM DIAGNOSIS

REFRIGERATION SYSTEM SYMPTOMS

Trouble Diagnosis For Unusual Pressure

INFOID:0000000011279478

Diagnose using a manifold gauge whenever system’s high and/or low side pressure(s) is/are unusual. The

marker above the gauge scale in the following tables indicates the standard (usual) pressure range. Refer to

above table (Ambient air temperature-to-operating pressure table) since the standard (usual) pressure, how-

ever, differs from vehicle to vehicle.

Symptom Table

INFOID:0000000011279479

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

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

The pressure returns to nor-
mal is reduced soon after wa-
ter is splashed on condenser.

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 
reading quickly drops by 
approximately 196 kPa 
(1.96 bar, 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 repeatedly and re-
charge system.

Engine tends to overheat.

Engine cooling systems mal-
function.

Check and repair each engine 
cooling system.

• An area of the low-pressure 

pipe is colder than areas 
near the evaporator outlet.

• Low-pressure pipe is some-

times covered 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.

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 lubricant for contami-

nation.

AC359A

AC360A

HA-18

< SYMPTOM DIAGNOSIS >

REFRIGERATION SYSTEM SYMPTOMS

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 be-
tween high- and low-pressure 
sides.

Compressor pressure opera-
tion is improper.
↓
Damaged inside compressor 
packings.

Replace compressor.

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 lubricant for contami-

nation.

•  Expansion valve inlet tem-

perature is extremely low 
as compared with areas 
near liquid tank.

• Expansion valve inlet is 

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 lubricant for contami-

nation.

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

Low refrigerant charge.
↓
Leaking fittings or components.

Check refrigerant for leaks. Re-
fer to 

HA-21, "Leak Test"

.

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.

• Replace expansion valve.
• 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.

• Check intake sensor circuit.

Refer to 

HAC-180, "Diagno-

sis Procedure"

.

• Replace compressor.
• Repair evaporator fins.
• Replace evaporator.
• Check blower motor circuit. 

Refer to 

HAC-180, "Diagno-

sis Procedure"

.

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

AC356A

AC353A

REFRIGERATION SYSTEM SYMPTOMS

HA-19

< SYMPTOM DIAGNOSIS >

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Low-pressure side sometimes be-
comes negative.

• Air conditioning system 

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

• The system constantly 

functions for a period of 
time after compressor is 
stopped and restarted.

Refrigerant does not discharge 
cyclically.
↓
Moisture is frozen at expansion 
valve outlet and inlet.
↓
Water is mixed with refrigerant.

• Drain water from refrigerant 

or replace refrigerant.

• Replace liquid tank.

Low-pressure side becomes nega-
tive.

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

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 mal-
function is caused by water or 
foreign particles.
• Cooling is initially okay if wa-

ter is the cause. Then the wa-
ter freezes causing a 
blockage. Drain water from 
refrigerant or replace refriger-
ant.

• Remove expansion valve and 

remove the particles with dry 
and compressed air (not shop 
air) if due to foreign particles.

• Replace expansion valve if 

either of the above methods 
cannot correct the malfunc-
tion.

• Replace liquid tank.
• Check lubricant for contami-

nation.

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

AC354A

AC362A