Nissan Qashqai (2007-2010). Manual — part 860
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HA-10
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER (HR/MR)]
REFRIGERATION SYSTEM
1.
Refrigerant pressure sensor
2.
Liquid tank
3.
Radiator
4.
Compressor
E1KIA0065ZZ
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REFRIGERATION SYSTEM
HA-11
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER (HR/MR)]
C
D
E
F
G
H
J
K
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A
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HA
N
O
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Component Description
INFOID:0000000001093752
1.
Blower motor assembly
2.
Evaporator
3.
Intake sensor (AT only)
4.
Expansion valve
E1KIA0034ZZ
Component
Description
Compressor
Intakes, compresses, and discharges refrigerant, then conveys it to condenser.
Condenser
Condenses refrigerant, and then conveys it to liquid tank.
Liquid tank
Drives moisture out of refrigerant, eliminates foreign matter, then conveys refrigerant to expan-
sion valve.
Refrigerant pressure sensor
Refer to
HAC-70, "Component Inspection"
.
Expansion valve
Vaporizes refrigerant, controls the amount of flow, then conveys refrigerant to evaporator.
Evaporator
Cools passing air, and then conveys it to compressor.
Blower motor
Takes in air in the vehicle or fresh outside air, and then adjusts room temperature by air condi-
tioning.
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HA-12
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER (HR/MR)]
REFRIGERATION SYSTEM SYMPTOMS
SYMPTOM DIAGNOSIS
REFRIGERATION SYSTEM SYMPTOMS
SYMPTOM DIAGNOSIS PROCEDURE
SYMPTOM DIAGNOSIS PROCEDURE : Trouble Diagnosis For Unusual Pressure
INFOID:0000000001093755
Whenever system’s high and/or low side pressure(s) is/are unusual, diagnose using a manifold gauge. The
marker above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the
standard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air tempera-
ture-to-operating pressure table).
BOTH HIGH- AND LOW-PRESSURE SIDES ARE TOO HIGH
BOTH HIGH- AND LOW-PRESSURE SIDES ARE TOO HIGH : Symptom Table
INFOID:0000000001093756
HIGH-PRESSURE SIDE IS TOO HIGH AND LOW-PRESSURE SIDE IS TOO LOW
HIGH-PRESSURE SIDE IS TOO HIGH AND LOW-PRESSURE SIDE IS TOO LOW :
Symptom Table
INFOID:0000000001093757
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
as necessary.
• Low-pressure pipe is not
cold.
• When compressor is
stopped high-pressure val-
ue quickly drops by approx-
imately 196 kPa (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.
AC359A
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REFRIGERATION SYSTEM SYMPTOMS
HA-13
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER (HR/MR)]
C
D
E
F
G
H
J
K
L
M
A
B
HA
N
O
P
HIGH-PRESSURE SIDE IS TOO LOW AND LOW-PRESSURE SIDE IS TOO HIGH
HIGH-PRESSURE SIDE IS TOO LOW AND LOW-PRESSURE SIDE IS TOO HIGH :
Symptom Table
INFOID:0000000001093758
BOTH HIGH- AND LOW-PRESSURE SIDES ARE TOO LOW
BOTH HIGH- AND LOW-PRESSURE SIDES ARE TOO LOW : Symptom Table
INFOID:0000000001093759
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
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.
AC360A
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
High-pressure side is too low and
low-pressure side is too high.
High- and low-pressure sides
become equal soon after com-
pressor 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.
AC356A
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