2006 NISSAN PATROL Service Manual

Trouble Diagnoses for Abnormal Pressure
Whenever system's high or low-pressure side is abnormal, diagnose using a manifold gauge. The marker
above the gauge scale in the following table indicates the standard (normal) pressure range. Since the stan-
dard (normal) pressure differs from vehicle to vehicle, refer to HA-35 (``Ambient air temperature-to-operating
pressure table'').
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high and low-pressure
sides are too high.
AC359A
+Pressure is reduced soon
after water is splashed on
condenser.Excessive refrigerant charge in
refrigeration cycle.Reduce refrigerant until speci-
®ed pressure is obtained.
Air suction by cooling fan is
insufficient.Insufficient condenser cooling
performance.
¯
j
1Condenser ®ns are clogged.
j
2Improper fan rotation of
cooling fan.+Clean condenser.
+Check and repair cooling fan
as necessary.
+Low-pressure pipe is not
cold.
+When compressor is stopped
high-pressure value quickly
drops by approximately 196
kPa (2.0 bar, 2 kg/cm
2,28
psi). It then decreases gradu-
ally thereafter.Poor heat exchange in con-
denser.
(After compressor operation
stops, high pressure decreases
too slowly.)
¯
Air in refrigeration cycle.Evacuate repeatedly and
recharge 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.
+Plates are sometimes cov-
ered with frost.+Excessive liquid refrigerant
on low-pressure side.
+Excessive refrigerant dis-
charge ¯ow.
+Expansion valve is open a
little compared with the
speci®cation.
¯
j
1Improper thermal valve
installation.
j
2Improper expansion valve
adjustment.Replace expansion valve.
High-pressure side is too high
and low-pressure side is too
low.
AC360A
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.
TROUBLE DIAGNOSESMANUAL
HA-36

Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too low
and low-pressure side is too
high.
AC356A
High and low-pressure sides
become equal soon after com-
pressor operation stops.Compressor pressure operation
is improper.
¯
Damaged inside compressor
packings.Replace compressor.
No temperature difference
between high and low-pressure
sides.Compressor pressure operation
is improper.
¯
Damaged inside compressor
packings.Replace compressor.
Both high and low-pressure
sides are too low.
AC353A
+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.Liquid tank inside is clogged a
little.+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 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 only cool
when touched.Low refrigerant charge.
¯
Leaking ®ttings or components.Check refrigerant for leaks.
Refer to ``Checking Refrigerant
Leaks'', HA-119.
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 speci®ca-
tion.
¯
j
1Improper expansion valve
adjustment.
j
2Malfunctioning thermal
valve.
j
3Outlet 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 ¯ow volume is not enough
or is too low.Compressor pressure operation
is improper.Replace compressor.
TROUBLE DIAGNOSESMANUAL
Trouble Diagnoses for Abnormal Pressure
(Cont'd)
HA-37

Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side sometimes
becomes negative.
AC354A
+Air conditioner system does
not function and does not
cyclically 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 expansion
valve outlet and inlet.
¯
Water is mixed with refrigerant.+Drain water from refrigerant
or replace refrigerant.
+Replace liquid tank.
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 ¯ow.
¯
Expansion valve or liquid tank
is frosted.Leave the system at rest. 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 refriger-
ant.
+If due to foreign particles,
remove expansion valve and
remove the particles with dry
and compressed air.
+If either of the above meth-
ods cannot correct the
problem, replace expansion
valve.
+Replace liquid tank.
+Check lubricant for contami-
nation.
TROUBLE DIAGNOSESMANUAL
Trouble Diagnoses for Abnormal Pressure
(Cont'd)
HA-38

Insufficient Heating
TROUBLE DIAGNOSIS PROCEDURE FOR INSUFFICIENT HEATING
SYMPTOM:
+Insufficient heating.
Inspection ¯ow
*1: HA-40
*2: HA-40*3: HA-22 *4: HA-21
RHA604G
TROUBLE DIAGNOSESMANUAL
HA-39

CONTROL LINKAGE ADJUSTMENT
Water cock control rod
+When adjusting water cock control rod, ®rst disconnect
temperature control cable from air mix door lever and then
adjust control rod. Reconnect temperature control cable
and readjust it. (Refer to TEMPERATURE CONTROL
CABLE.)
1. Push air mix door lever in direction of arrow.
2. Pull control rod of water cock in direction of arrow so as to make
clearance of about 2 mm (0.08 in) between ends of rod and link
lever and connect the rod to door lever.
After connecting control rod, check it operates properly.
Temperature control cable
1. Move the temperature control knob to the full hot position.
2. Set the air mix door lever in the full hot position.
3. Pull on the cable cover in the direction of the arrow, then clamp
it.
After positioning control cable, check that it operates properly.
SHA522E
RHA632EA
TROUBLE DIAGNOSESMANUAL
Insufficient Heating (Cont'd)
HA-40

Air Outlet
TROUBLE DIAGNOSIS PROCEDURE FOR AIR OUTLET
SYMPTOM:
+Air does not change.
Inspection ¯ow
*1: HA-42
*2: HA-22*3: HA-21 *4: HA-13
RHA605G
TROUBLE DIAGNOSESMANUAL
HA-41

CONTROL LINKAGE ADJUSTMENT
Mode control cable
1. Turn the mode control knob to the DEF position.
2. Set the side link in the DEF position by hand.
3. Pull on the cable cover in the direction of the arrow, then clamp
it.
After positioning control cable, check that it operates properly.
RHA630EA
TROUBLE DIAGNOSESMANUAL
Air Outlet (Cont'd)
HA-42

Magnet Clutch
TROUBLE DIAGNOSIS PROCEDURE FOR MAGNET CLUTCH
SYMPTOM:
+Magnet clutch does not operate when A/C switch and fan switch are ON.
Inspection ¯ow
*1: HA-119
*2: HA-44*3: HA-22 *4: HA-21
RHA606G
TROUBLE DIAGNOSESMANUAL
HA-43