Nissan Primera P11. Manual — part 470
Performance Test Diagnoses
INSUFFICIENT COOLING
INSUFFICIENT COOLING
CHECK AIR FLOW.
OK
E
NG
CHECK BLOWER MOTOR OPERA-
TION.
OK
NG
CHECK COMPRESSOR OPERATION.
OK
NG
Clogged blower inlet/
Clogged duct/Loose duct
connection/Air leakage, etc.
p
A
(Go to
next
page.)
p
B
(Go to
next page.)
OK
CHECK HIGH AND LOW SIDE PRESSURE. USE
PERFORMANCE CHART. (Refer to HA-35.)
NG
H
RECOVER REFRIGERANT USING RECOVERY
RECYCLING EQUIPMENT AND CHARGE
SPECIFIED AMOUNT OF REFRIGERANT.
F
Note
CHECK HIGH AND LOW SIDE PRESSURE. USE
PERFORMANCE CHART. (Refer to HA-35.)
BOTH HIGH AND LOW
PRESSURE SIDES ARE
TOO HIGH.
E
E
CHECK DISCHARGE AIR TEMPERATURE. USE
PERFORMANCE CHART. (Refer to HA-35.)
NG
OK
HIGH PRESSURE SIDE
IS TOO HIGH AND LOW
PRESSURE SIDE IS
TOO LOW.
E
END
HIGH PRESSURE SIDE
IS TOO LOW AND LOW
PRESSURE SIDE IS
TOO HIGH.
E
Malfunctioning temperature control operation (air
mix door position improperly adjusted)/
Malfunctioning water cock operation (incorrect
valve closure)
BOTH HIGH AND LOW
PRESSURE SIDES ARE
TOO LOW.
E
LOW PRESSURE SIDE
SOMETIMES BECOMES
NEGATIVE.
E
LOW PRESSURE SIDE
BECOMES NEGATIVE.
E
Note:
−
correspond to those in TROUBLE DIAGNOSES FOR
ABNORMAL PRESSURE.
(Refer to HA-36.)
H
H
H
H
H
H
H
H
H
H
TROUBLE DIAGNOSES
AUTO
HA-33
p
A
Malfunctioning blower motor fan
Malfunctioning electrical circuit
Malfunctioning blower motor inter-
nal circuit
Loose fan/Improper contact of fan
and case/Deformed fan
Discontinued wiring or component
circuits or poor connection/
Malfunctioning resistor, amplifier,
etc./ Burned out fuse or low bat-
tery voltage.
p
B
Magnet clutch does not engage.
Magnet clutch slipping
Belt slipping
CHECK MAGNET CLUTCH
(coil circuit, disc-to-pulley clear-
ance).
CHECK COMPRESSOR BELT
AND BELT TENSION.
CHECK ELECTRICAL CIRCUIT
(wiring, components circuit).
E
Malfunctioning internal parts of
clutch, compressor
CHECK ACTIVATION OF
SAFETY/PROTECTION DEVICES
(such as pressure switch, etc.).
E
Foreign particles on clutch fric-
tional surface or excessive disc
clearance
E
Malfunctioning electrical circuit
(poor connection, low battery
voltage, etc.)
H
H
H
H
H
H
H
H
H
H
H
H
TROUBLE DIAGNOSES
AUTO
Performance Test Diagnoses (Cont’d)
HA-34
A/C Performance Chart
TEST CONDITION
Testing must be performed as follows:
Vehicle location: Indoors or in shade (in a well ventilated
place)
Doors: Closed
Door window: Open
Temp lever position: Max COLD
Mode switch position: Ventilation
Intake switch position: Recirculation
Fan switch position: Max
Engine speed: Idling 825-850 rpm
TEST READING (RHD & LHD MODELS)
Recirculating-to-discharge air temperature table
Inside air (Recirculating air)
at blower assembly inlet
Discharge air temperature at center ventilator
°C (°F)
Relative humidity
%
Air temperature
°C (°F)
50 - 60
20 (68)
6.4 - 8.0 (44 - 46)
25 (77)
10.6 - 12.4 (51 - 54)
30 (86)
14.6 - 17.0 (58 - 63)
35 (95)
19.0 - 22.0 (66 - 72)
40 (104)
23.3 - 27.2 (74 - 81)
60 - 70
20 (68)
8.0 - 9.6 (46 - 49)
25 (77)
12.4 - 14.6 (54 - 58)
30 (86)
17.0 - 19.7 (63 - 67)
35 (95)
22.0 - 24.9 (72 - 77)
40 (104)
27.2 - 30.2 (81 - 86)
Ambient air temperature-to-operating pressure table
Ambient air
High-pressure (Discharge side)
kPa (bar, kg/cm
2
, psi)
Low-pressure (Suction side)
kPa (bar, kg/cm
2
, psi)
Relative humidity
%
Air temperature
°C (°F)
50 - 70
20 (68)
736 - 902
(7.36 - 9.02, 7.5 - 9.2, 107 - 131)
118 - 186
(1.18 - 1.86, 1.2 - 1.9, 17 - 27)
25 (77)
873 - 1098
(8.73 - 10.98, 8.9 - 11.2, 127 - 159)
137 - 216
(1.37 - 2.16, 1.4 - 2.2, 20 - 31)
30 (86)
1,079 - 1,275
(10.79 - 12.75, 11.0 - 13.0, 156 - 185)
157 - 245
(1.57 - 2.45, 1.6 - 2.5, 23 - 36)
35 (95)
1,304 - 1,608
(13.04 - 16.08, 13.3 - 16.4, 189 - 233)
206 - 304
(2.06 - 3.04, 2.1 - 3.1, 30 - 44)
40 (104)
1,550 - 1,912
(15.50 - 19.13, 15.8 - 19.5, 225 - 277)
255 - 363
(2.55 - 3.63, 2.6 - 3.7, 37 - 53)
TROUBLE DIAGNOSES
AUTO
HA-35
Trouble Diagnoses for Abnormal Pressure
Whenever the system’s high and/or low side pressure is abnormal, diagnose using a manifold gauge. The
marker above the gauge scale in the following tables indicates the standard (normal) pressure range. Since
the standard (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
specified pressure is
obtained.
Air suction by cooling fan is
insufficient.
Insufficient condenser cooling
performance
"
p
1
Condenser fins are
clogged.
p
2
Improper cooling fan
rotation.
●
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 gradually
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-pres-
sure 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
little compared with the
specification.
"
p
1
Improper thermal valve
installation.
p
2
Improper 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 con-
tamination.
TROUBLE DIAGNOSES
AUTO
HA-36
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