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Page 3290 of 3745

NISSAN LATIO 2010 Service Repair Manual PREPARATIONMTC-11
< SERVICE INFORMATION >
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PREPARATION
HFC-134a (R-134a) Service Tool and EquipmentINFOID:0000000005396482
Never mix HFC-134a refrigerant and/or its spe

Page 3331 of 3745

NISSAN LATIO 2010 Service Repair Manual MTC-52
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Both High- and Low-pressure Sides are Too Low
Low-pressure Side Sometimes Becomes Negative
Low-pressure Side Becomes Negative
Gauge indication Refriger

MTC-52
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Both High- and Low-pressure Sides are Too Low
Low-pressure Side Sometimes Becomes Negative
Low-pressure Side Becomes Negative
Gauge indication Refrigerant cycle Probable causeCorrective action
Both high- and low-pressure
sides are too low. • There is a big temperature dif-
ference between liquid tank
outlet and inlet. Outlet tem-
perature is extremely low.
• Liquid tank inlet and expan- sion valve are frosted. Liquid tank inside is slightly
clogged.
• Replace liquid tank.
• Check oil for contamination.
• Temperature of expansion valve inlet is extremely low as
compared with areas near liq-
uid tank.
• Expansion valve inlet may be
frosted.
• Temperature difference oc- curs somewhere in high-pres-
sure side. High-pressure pipe located be-
tween liquid tank and expansion
valve is clogged.
• Check and repair malfunc-
tioning parts.
• Check oil for contamination.
Expansion valve and liquid tank
are warm or only cool when
touched. Low refrigerant charge.
↓
Leaking fittings or componentsCheck refrigerant for leaks.
Refer to
MTC-92, "
Checking of
Refrigerant Leaks" .
There is a big temperature dif-
ference between expansion
valve inlet and outlet while the
valve itself is frosted. Expansion valve closes a little
compared with the specification.
↓
1. Improper expansion valve
adjustment.
2. Malfunctioning expansion valve.
3. Outlet and inlet may be clogged. • Remove foreign particles by
using compressed air.
• Replace expansion valve.
• Check oil for contamination.
An area of the low-pressure pipe
is colder than areas near the
evaporator outlet. Low-pressure pipe is clogged or
crushed.• Check and repair malfunc-
tioning parts.
• Check oil for contamination.
Air flow volume is not enough or
is too low. Evaporator is frozen.• Check thermo control amp.
Refer to MTC-38, "
Magnet
Clutch Circuit (If Equipped)"
.
• Replace compressor.
• Repair evaporator fins.
• Replace evaporator.
•Refer to MTC-34, "
Front
Blower Motor Circuit" .
AC353A
Gauge indication Refrigerant cycleProbable causeCorrective action
Low-pressure side sometimes be-
comes negative. • Air conditioning system does
not function and does not cy-
clically cool the compart-
ment air.
• The system constantly func-
tions for a certain period of
time after compressor is
stopped and restarted. Refrigerant does not discharge
cyclically.
↓
Moisture is frozen at expan-
sion valve outlet and inlet.
↓
Water is mixed with refrigerant.
• Drain water from refrigerant
or replace refrigerant.
• Replace liquid tank.
AC354A
Revision: January 20102010 Versa

Page 3332 of 3745

NISSAN LATIO 2010 Service Repair Manual TROUBLE DIAGNOSISMTC-53
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Insufficient HeatingINFOID:0000000005396504
SYMPTOM: Insufficient heating
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMI

TROUBLE DIAGNOSISMTC-53
< SERVICE INFORMATION >
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Insufficient HeatingINFOID:0000000005396504
SYMPTOM: Insufficient heating
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERAT IONAL CHECK - TEMPERATURE INCREASE
1. Turn temperature control dial clockwise to maximum heat position.
2. Check for hot air at discharge air outlets.
Can the symptom be duplicated?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to MTC-31, "
Operational Check" .
Does another symptom exist?
YES >> Refer to MTC-23, "How to Perform Trouble Diagnosis for Quick and Accurate Repair" .
NO >> System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.CHECK COOLANT SYSTEM
1. Check engine coolant level. Refer to CO-12, "
Inspection" (HR16DE) or CO-36, "Inspection" (MR18DE).
2. Check hoses for leaks or kinks.
3. Check Radiator cap. Refer to CO-15, "
Checking Radiator Cap" HR16DE or CO-39, "Checking Radiator
Cap" (MR18DE).
OK or NG
OK >> GO TO 5.
NG >> Repair/replace as necessary.
5.CHECK AIR MIX DOOR CABLE
Check air mix door cable operation. Refer to MTC-65, "
Air Mix Door Cable Adjustment" .
OK or NG
Gauge indication Refrigerant cycleProbable causeCorrective action
Low-pressure side becomes nega-
tive. Liquid tank or front/rear side of
expansion valve’s pipe is frost-
ed or dewed.High-pressure side is closed
and refrigerant does not flow.
↓
Expansion valve or liquid tank
is frosted.Leave the system at rest until
no frost is present. Start it
again to check whether or not
the malfunction is caused by
water or foreign particles.
• If water is the cause, initially
cooling is okay. Then the wa-
ter freezes causing a block-
age. Drain water from
refrigerant or replace refrig-
erant.
• If due to foreign particles, re-
move expansion valve and
remove the particles with dry
and compressed air (not
shop air).
• If either of the above meth- ods cannot correct the mal-
function, replace expansion
valve.
• Replace liquid tank.
• Check oil for contamination.
AC362A
Revision: January 20102010 Versa

Page 3334 of 3745

NISSAN LATIO 2010 Service Repair Manual TROUBLE DIAGNOSISMTC-55
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*1. MTC-31, "Operational Check"*2.EM-14, "Checking" (HR16DE) or EM-
132, "Checking Drive Belts"
(MR18DE) *3.
MTC-46,

Page 3355 of 3745

NISSAN LATIO 2010 Service Repair Manual MTC-76
< SERVICE INFORMATION >
REFRIGERANT LINES
7. Manifold gauge set (J-39183) A. Preferred (best) method B. Alternative method
C. For charging
*1 MTC-17, "
Maintenance of Oil Quanti-
ty in Compress

Page 3359 of 3745

NISSAN LATIO 2010 Service Repair Manual MTC-80
< SERVICE INFORMATION >
REFRIGERANT LINES
1. Use the recovery/recycling equipment to evacuate the refrigerant. Refer to MTC-75, "HFC-134a (R-134a)
Service Procedure".
2. Disconnect the low-pres

Page 3361 of 3745

NISSAN LATIO 2010 Service Repair Manual MTC-82
< SERVICE INFORMATION >
REFRIGERANT LINES
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
• Replace O-rings of low-pressure flexible hose and high-pressure flexible hos

Page 3370 of 3745

NISSAN LATIO 2010 Service Repair Manual REFRIGERANT LINESMTC-91
< SERVICE INFORMATION >
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4. Remove liquid tank bracket (1 ) from protruding part of con-
denser (2).
5. Slide liquid tank (3) upward, and then r

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