2001 NISSAN ALMERA cooling

NHA377
3. Check RecirculationNJHA0130S02031. Press the Recirculation (REC) switch. Recirculation indicator
should illuminate.
2. Listen for intake door position change.
If NG, go to trouble diagnosis procedure for intake door (HA-36).
If OK, continue with next check.
NHA378
4. Check Temperature DecreaseNJHA0130S02041. Turn the temperature control knob to full cold.
2. Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for insufficient cooling
(HA-68).
If OK, continue with next check.
NHA379
5. Check Temperature IncreaseNJHA0130S02051. Turn the temperature control knob to full hot.
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for insufficient heating
(HA-76).
NHA380
6. Check Air Conditioner SwitchNJHA0130S0206Turn the fan control switch to the desired (1 to 4 speed) position
and push the A/C switch to turn ON the air conditioner.
The indicator lamp should come on when air conditioner is ON.
If NG, go to trouble diagnosis procedure for magnet clutch (HA-55).
TROUBLE DIAGNOSES
Operational Check (Cont'd)
HA-35

RHA796H
COMPONENT DESCRIPTIONNJHA0217Max Hot Door MotorNJHA0217S01The max hot door motor is attached to the heater & cooling unit.
Mode door positionTemperature control
positionMax hot door position
FOOT, D/FFull hot OPEN
All except full hot SHUT
VENT, B/L, DEFFull hot SHUT
All except full hot SHUT
DIAGNOSTIC PROCEDURE FOR MAX HOT DOOR MOTOR CIRCUITNJHA0218
1 CHECK SIGNAL FOR OPEN OPERATION
1. Turn ignition switch to ON position.
2. Set temperature dial to ªFULL COLDº position, and mode control dial to the ªDEF (
)º, ªVENT ()º or ªBI-LEVEL
(
)º position.
3. Set temperature dial to ªFULL HOTº position, and mode control dial to the ªFOOT (
)º or ªFOOT/DEF ()º posi-
tion. At this time, does an approx. 12 volts exist between the max hot door motor harness connector terminal 7 and the
body ground until the max hot door is fully opened?
RHA920HA
YesorNo
Ye s©GO TO 2.
[If max hot door motor does not operate even if approx. 12 volts exist, then replace max
hot door motor. (Before replacing the motor, check for smooth operation of the door.)]
No©GO TO 3.
TROUBLE DIAGNOSES
Max Hot Door (For Scandinavia and Cold Spec Models) (Cont'd)
HA-45

Insufficient Cooling
TROUBLE DIAGNOSIS PROCEDURE FOR INSUFFICIENT COOLING=NJHA0148SYMPTOM:
+Insufficient Cooling.
INSPECTION FLOW
NHA390
*1: HA-42
*2: HA-72
*3: HA-69*4: HA-34
*5: HA-33
*6: HA-83*7: EM-16 (QG),
EM-85 (YD)
*8: EC-406 (QG) Europe,
EC-730 (YD) Europe
TROUBLE DIAGNOSES
Insufficient Cooling
HA-68

PERFORMANCE TEST DIAGNOSESNJHA0149
SHA419F
*1: HA-71
*2: HA-71*3: HA-72 *4: HA-43
TROUBLE DIAGNOSES
Insufficient Cooling (Cont'd)
HA-69

SHA361FA
*1: HA-86 *2: HA-48 *3: EM-16 (QG),
EM-85 (YD)
TROUBLE DIAGNOSES
Insufficient Cooling (Cont'd)
HA-70

PERFORMANCE CHART=NJHA0150Test ConditionNJHA0150S01Testing must be performed as follows:
Vehicle location: Indoors or in the shade (in a well-ventilated place)
Doors: Closed
Door window: Open
Hood: Open
TEMP.: Max. COLD
Discharge Air: Face Vent
REC switch: (Recirculation) set
FAN speed: High speed
Engine speed: Idle speed
Operate the air conditioning system for 10 minutes before taking
measurements.
Test ReadingNJHA0150S02Recirculating-to-discharge Air Temperature TableNJHA0150S0201
Inside air (Recirculating air) at blower assembly inlet
Discharge air temperature at center venti-
lator
ÉC (ÉF) Relative humidity
%Air temperature
ÉC (ÉF)
50-6020 (68) 6.0 - 8.8 (43 - 48)
25 (77) 9.5 - 12.8 (49 - 55)
30 (86) 14.1 - 17.7 (57 - 64)
60-7020 (68) 8.8 - 11.6 (48 - 53)
25 (77) 12.8 - 16.2 (55 - 61)
30 (86) 17.7 - 21.1 (64 - 70)
TROUBLE DIAGNOSES
Insufficient Cooling (Cont'd)
HA-71

Ambient Air Temperature-to-operating Pressure Table=NJHA0150S0202
Ambient air
High-pressure (Discharge side)
kPa (bar, kg/cm
2, psi)Low-pressure (Suction side)
kPa (bar, kg/cm2, psi) Relative humidity
%Air temperature
ÉC (ÉF)
50-7020 (68)659 - 805
(6.590 - 8.052, 6.72 - 8.21,
95.6 - 116.7)171 - 214
(1.706 - 213.8, 1.74 - 2.18,
24.7 - 31.0)
25 (77)799 - 980
(7.993 - 9.797, 8.15 - 9.99,
115.9 - 142.1)185 - 220
(1.854 - 2.197, 1.89 - 2.24,
26.9 - 31.9)
30 (86)953 - 1,170
(9.532 - 11.700, 9.72 - 11.93,
138.2 - 169.6)199 - 240
(1.991 - 2.403, 2.03 - 2.45,
28.9 - 34.8)
35 (95)1,121 - 1,363
(11.209 - 13.632, 11.43 -
13.90, 162.5 - 197.7)228 - 282
(2.275 - 2.824, 2.32 - 2.88,
33.0 - 41.0)
40 (104)1,298 - 1,584
(12.984 - 15.838, 13.24 -
16.15, 188.3 - 229.7)273 - 333
(2.726 - 3.334, 2.78 - 3.40,
39.5 - 48.3)
TROUBLE DIAGNOSES FOR ABNORMAL PRESSURENJHA0151Whenever 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 stan-
dard (normal) pressure, however, differs from vehicle to vehicle, refer to HA-72 (ªAmbient air temperature-to-
operating pressure tableº).
TROUBLE DIAGNOSES
Insufficient Cooling (Cont'd)
HA-72

Both High- and Low-pressure Sides are Too High.NJHA0151S01
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 cycleReduce refrigerant until speci-
fied pressure is obtained.
Air suction by cooling fan is
insufficient.Insufficient condenser cooling
performance
¯
1. Condenser fins are
clogged.
2. Improper 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 gradually
thereafter.Poor heat exchange in con-
denser
(After compressor operation
stops, high pressure
decreases too slowly.)
¯
Air in refrigeration cycleEvacuate 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.
¯
1. Improper thermal valve
installation
2. Improper expansion valve
adjustmentReplace expansion valve.
High-pressure Side is Too High and Low-pressure Side is Too Low.NJHA0151S02
Gauge indication Refrigerant cycle Probable cause Corrective action
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
Insufficient Cooling (Cont'd)
HA-73