Nissan Qashqai (2007-2010). Manual - part 860

HA-10

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER (HR/MR)]

REFRIGERATION SYSTEM

1.

Refrigerant pressure sensor

2.

Liquid tank

3.

Radiator

4.

Compressor

E1KIA0065ZZ

REFRIGERATION SYSTEM

HA-11

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER (HR/MR)]

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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.

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

REFRIGERATION SYSTEM SYMPTOMS

HA-13

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER (HR/MR)]

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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