2005 NISSAN NAVARA cooling

TROUBLE DIAGNOSIS
ATC-99
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Low-pressure Side Sometimes Becomes Negative
Low-pressure Side Becomes Negative
Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side sometimes
becomes negative.
lAir conditioning system
does not function and does
not cyclically cool the com-
partment air.
lThe 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.
lDrain water from refrigerant
or replace refrigerant.
lReplace liquid tank.
AC354A
Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side becomes nega-
tive.
Liquid tank or front/rear side of
expansion valve¢spipeis
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 malfunction is caused by
water or foreign particles.
lIf water is the cause, initially
cooling is okay. Then the
water freezes causing a
blockage. Drain water from
refrigerant or replace refrig-
erant.
lIf due to foreign particles,
remove expansion valve
and remove the particles
with dry and compressed air
(not shop air).
lIf either of the above meth-
ods cannot correct the mal-
function, replace expansion
valve.
lReplace liquid tank.
lCheck lubricant for contami-
nation.
AC362A

ATC-114
TROUBLE DIAGNOSIS
Intake Sensor Circuit
EJS006BZ
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor is located on the heater & cooling unit. It converts
temperature of air after it passes through the evaporator into a resis-
tance value which is then input to the front air control.
DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR
SYMPTOM: Intake sensor circuit is open or shorted. (56 or 57 is indi-
cated on front air control as a result of conducting Self-diagnosis.)
1.CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND
1. Disconnect intake sensor connector.
2. Turn ignition switch ON.
3. Check voltage between intake sensor harness connector M82
terminal 2 and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 4.
2.CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector.
3. Check continuity between intake sensor harness connector M82
terminal 1 and front air control harness connector M60 terminal
13.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
MJIB0173E
WJIA1156E
2 - Ground : Approx. 5V
WJIA1278E
1 - 13 : Continuity should exist.
WJIA1157E

ATC-120
INTAKE SENSOR
INTAKE SENSOR
PFP:27723
Removal and InstallationEJS006C4
REMOVAL
1. Remove the front kick plate.
2. Remove the instrument panel side finisher.
3. Remove the glove box.
4. Remove the front pillar finisher.
5. Remove the upper glove box (cluster lid E).
6. Disconnect the intake sensor electrical connector.
NOTE:
The intake sensor is located on the top of the heater and cooling
unit assembly next to the A/C evaporator cover.
7. Twist the intake sensor to remove the intake sensor from the
heater and cooling unit assembly.
INSTALLATION
Installation is in the reverse order of removal.
MJIB0325E

BLOWER MOTOR
ATC-121
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BLOWER MOTORPFP:27226
ComponentsEJS006C5
Removal and InstallationEJS006C6
REMOVAL
1. Remove the lower glove box assembly. Refer toIP-10, "Removal and Installation".
2. Disconnect the blower motor electrical connector.
3. Remove the three screws and remove the blower motor.
INSTALLATION
Installation is in the reverse order of removal.
1. Heater and cooling unit assembly 2. Blower motor 3. Variable blower control
MJIB0210E

ATC-122
AIR CONDITIONER FILTER
AIR CONDITIONER FILTER
PFP:27277
Removal and InstallationEJS006C7
FUNCTION
The air inside the passenger compartment is filtered by the air condi-
tioner filters when the heater or A/C controls are set on either the
recirculation or fresh mode. The two air conditioner filters are located
in the heater and cooling unit assembly.
REPLACEMENT TIMING
Replacement of the two air conditioner filters is recommended on a regular interval depending on the driving
conditions. Refer toMA-8, "
PERIODIC MAINTENANCE". It may also be necessary to replace the two air con-
ditioner filters as part of a component replacement if the air conditioner filters are damaged.
REPLACEMENT PROCEDURE
1. Remove the RH lower dash side finisher. Refer toEI-33, "BODY SIDE TRIM".
2. Remove the front pillar lower finisher. Refer toEI-33, "
BODY SIDE TRIM".
3. Remove the lower glove box.
a. Remove the two lower glove box lower screws.
b. Open the lower glove box, then remove the two lower glove box
upper screws.
c. Disconnect the two upper clips and remove the lower glove box
from the instrument panel to access the air conditioner filter
cover.
4. Remove the screw and remove the air conditioner filter cover.
5. Remove the air conditioner filters from the heater and cooling
unit housing.
MJIB0215E
WLIA0023E
MJIB0216E

AIR CONDITIONER FILTER
ATC-123
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6. Insert the first new air conditioner filter into the heater and cool-
ing unit housing and slide it over to the right. Insert the second
new air conditioner filter into the heater and cooling unit housing.
NOTE:
The air conditioner filters are marked with air flow arrows. The
end of the microfilter with the arrow should face the rear of the
vehicle. The arrows should point downward.
7. Install the air conditioner filter cover.
8. Install the lower glove box in reverse order of removal.
NOTE:
lUse the two tabs at the bottom of the lower glove box to align the lower glove box for installation.
lThe clips at the top of the lower glove box must be fully seated before installing the lower glove box
upper and lower screws.
LJIA0148E
MJIB0216E
Lower glove box lower screws : 3.3 N·m (0.34 kg-m, 29 in-lb)
Lower glove box upper screws : 3.3 N·m (0.34 kg-m, 29 in-lb)

ATC-124
HEATER & COOLING UNIT ASSEMBLY
HEATER & COOLING UNIT ASSEMBLY
PFP:27110
ComponentsEJS006C8
Heater and Cooling Unit Assembly —LHD Models—
MJIB0278E
1. High-pressure A/C pipe 2. Low-pressure A/C pipe 3. Expansion valve
4. Heater core and evaporator pipes
grommet5. A/C drain hose grommet 6. A/C drain hose
7. Heater core pipes 8. Coolant reservoir hose 9. Heater and cooling unit assembly

HEATER & COOLING UNIT ASSEMBLY
ATC-125
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Heater and Cooling Unit Assembly —RHD Models—
MJIB0279E
1. High-pressure A/C pipe A 2. High-pressure A/C pipe B 3. Low-pressure A/C pipe
4. Expansion valve 5. Heater core and evaporator pipes
grommet6. A/C drain hose grommet
7. A/C drain hose 8. Heater core pipe mounts 9. Heater core pipes
10. Heater and cooling unit assembly