Nissan X-Trail 32. Manual - part 1353

PERFORMANCE TEST

HA-71

< BASIC INSPECTION >

[MR20DD]

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PERFORMANCE TEST

Inspection

INFOID:0000000011000276

INSPECTION PROCEDURE

1.

Connect recovery/recycling/recharging equipment (for HFC-134a) or manifold gauge.

2.

Start the engine, and set to the following condition.

Test condition

3.

Maintain test condition until A/C system becomes stable. (Approximately 10 minutes)

4.

Check that test results of “recirculating-to-discharge air temperature” and “ambient air temperature-to-
operating pressure” are within the specified value.

5.

When test results are within the specified value, inspection is complete.
If any of test result is out of the specified value, perform diagnosis by gauge pressure. Refer to 

HA-73,

"Symptom Table"

.

RECIRCULATING-TO-DISCHARGE AIR TEMPERATURE TABLE

AMBIENT AIR TEMPERATURE-TO-OPERATING PRESSURE TABLE

Surrounding condition

Indoors or in the shade (in a well-ventilated place)

Vehicle condition

Door

Closed

Door glass

Full open

Hood

Open

Engine speed

Idle speed

A/C condition

Temperature control switch or dial

Full cold

A/C switch

ON

Air outlet

VENT (ventilation)

Intake door position

Recirculation

Fan (blower) speed

Maximum speed set

Inside air (Recirculating air) at blower assembly inlet

Discharge air temperature from center ventilator

°

C (

°

F)

Relative humidity

%

Air temperature

°

C (

°

F)

50 – 60

20 (68)

4.9 – 6.9 (41 – 44)

25 (77)

9.1 – 11.6 (48 – 53)

30 (86)

13.2 – 16.2 (56 – 61)

35 (95)

17.6 – 21.1 (64 – 70)

60 – 70

20 (68)

6.9 – 8.9 (44 – 48)

25 (77)

11.6 – 14.1 (53 – 57)

30 (86)

16.2 – 19.2 (61 – 66)

35 (95)

21.1 – 24.6 (70 – 76)

HA-72

< BASIC INSPECTION >

[MR20DD]

PERFORMANCE TEST

Fresh 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

25 (77)

926 – 1,133

(9.3 – 11.3, 9.5 – 11.6, 134.3 – 

164.2)

196 – 240

(2.0 – 2.4, 2.0 – 2.5, 28.4 – 34.8)

30 (86)

1,070 -– 1,308

(10.7 – 13.1, 10.9 – 13.3, 155.1 – 

189.6)

233 – 285

(2.3 – 2.9, 2.4 – 2.9, 33.8 – 41.3)

35 (95)

1,091 – 1,332

(10.9 – 13.3, 11.1 – 13.6, 158.1 – 

193.2)

278 – 340

(2.8 – 3.4, 2.8 – 3.5, 40.3 – 49.2)

40 (104)

1,292 – 1,579

(12.9 – 15.8, 13.2 – 16.1, 187.3 – 

228.9)

333 – 407

(3.3 – 4.1, 3.4 – 4.2, 48.3 – 59.0)

REFRIGERATION SYSTEM SYMPTOMS

HA-73

< SYMPTOM DIAGNOSIS >

[MR20DD]

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SYMPTOM DIAGNOSIS

REFRIGERATION SYSTEM SYMPTOMS

Trouble Diagnosis For Unusual Pressure

INFOID:0000000011001057

Diagnose using a manifold gauge whenever system’s high and/or low side pressure(s) is/are unusual. The
marker above the gauge scale in the following tables indicates the standard (usual) pressure range. Refer to
above table (Ambient air temperature-to-operating pressure table) since the standard (usual) pressure, how-
ever, differs from vehicle to vehicle.

Symptom Table

INFOID:0000000011001058

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

Both high- and low-pressure sides 
are too high.

The pressure returns to nor-
mal soon after sprinkling wa-
ter on condenser.

Overfilled refrigerant.

Collect all refrigerant, evacuate 
refrigerant cycle again, and 
then refill it with the specified 
amount of refrigerant.

Air flow to condenser is insuf-
ficient.

Insufficient condenser cooling 
performance.
• Poor fan rotation of radiator 

and condenser.

• Improper installation of air 

guide.

• Clogged or dirty condenser 

fins.

• Repair or replace malfunc-

tioning parts.

• Clean and repair condenser 

fins.

When compressor is stopped, 
a high-pressure reading 
quickly drops by approximate-
ly 196 kPa (1.96 bar, 2 kg/

cm

2

, 28 psi). It then gradually 

decreases.

Air mixed in refrigerant cycle.

Collect all refrigerant, evacuate 
refrigerant cycle again, and 
then refill it with the specified 
amount of refrigerant.

• Low-pressure pipe is cooler 

than the outlet of evapora-
tor.

• Low-pressure pipe is frost-

ed.

Expansion valve opened too 
much (excessive flow of refrig-
erant).

Replace expansion valve.

High-pressure side is excessively 
high and low-pressure side is too 
low.

High-pressure pipe and upper 
side of condenser become 
hot, however, liquid tank does 
not become so hot.

Clogged or crushed high-pres-
sure pipe located between 
compressor and condenser.

Repair or replace the malfunc-
tioning parts.

High-pressure side is too low and 
low-pressure side is too high.

• The readings of both sides 

become equal soon after 
compressor operation 
stops.

• There is no temperature dif-

ference between high- and 
low-pressure sides.

Malfunction in compressor sys-
tem (insufficient compressor 
pressure operation).
• Damage or breakage of 

valve.

• Malfunctioning gaskets.

Replace compressor.

AC359A

AC360A

AC356A

HA-74

< SYMPTOM DIAGNOSIS >

[MR20DD]

REFRIGERATION SYSTEM SYMPTOMS

Both high- and low-pressure sides 
are too low.

• The area around evapora-

tor outlet does not become 
cold.

• The area around evapora-

tor inlet becomes frosted.

Clogged expansion valve.
• Breakage of temperature 

sensor.

• Clogging by foreign material.

Eliminate foreign material from 
expansion valve, or replace it.

• There is a temperature dif-

ference between the areas 
around outlet and inlet 
pipes of liquid tank.

• Liquid tank becomes frost-

ed.

Malfunction in inner liquid tank 
(clogged strainer).

Replace condenser and liquid 
tank.

Evaporator becomes frosted.

Clogged or crushed low-pres-
sure pipe.

Repair or replace malfunction-
ing parts.

Malfunction in intake air tem-
perature sensor.

Check intake sensor system. 
Refer to 

HAC-81, "Diagnosis 

Procedure"

 (AUTOMATIC AIR 

CONDITIONING), 

HAC-192, 

"Diagnosis Procedure"

 (MANU-

AL AIR CONDITIONING).

There is a small temperature 
difference between the high 
and low pressure pipes for re-
frigerant cycle.

• Shortage of refrigerant.
• Leakage of refrigerant.

• Check for leakage.
• Collect all refrigerant, evacu-

ate refrigerant cycle again, 
and then refill it with the spec-
ified amount of refrigerant.

Low-pressure side sometimes be-
comes negative.

• Sometimes the area 

around evaporator outlet 
does not become cold.

• Sometimes the area 

around evaporator inlet is 
frosted.

• Icing caused by the mixing of 

water in cooler cycle.

• Deteriorated dryer in liquid 

tank.

• Collect all refrigerant.
• Evacuate refrigerant cycle 

completely, and then refill it 
with the specified amount of 
refrigerant. At this time, al-
ways replace condenser and 
liquid tank.

Hunting in high-pressure side.

There is no temperature dif-
ference between high- and 
low-pressure sides.

Malfunctioning variable valve 
in compressor.

• Replace compressor.
• Check ECV system. Refer to 

HAC-113, "Diagnosis Proce-
dure"

 (AUTOMATIC AIR 

CONDITIONING), 

HAC-212, 

"Diagnosis Procedure"

 

(MANUAL AIR CONDITION-
ING).

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

AC353A

AC354A