2006 NISSAN VERSA cooling

ENGINE MAINTENANCE
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FLUSHING COOLING SYSTEM
1. Install reservoir tank if removed. Refer to CO-11, "RADIATOR" .
2. Install radiator drain plug.

If water drain plug on cylinder block is removed, close and tighten it. Refer to EM-77, "CYLIN-
DER BLOCK" .
CAUTION:
Be sure to clean radiator drain plug and install with new O-ring. Refer to CO-11, "
Components" .
3. Fill radiator and reservoir tank with water and reinstall radiator cap.
4. Run engine and warm it up to normal operating temperature.
5. Rev engine two or three times under no-load.
6. Stop engine and wait until it cools down.
7. Drain water from the cooling system. Refer to MA-13, "
DRAINING ENGINE COOLANT" .
8. Repeat steps 1 through 7 until clear water begins to drain from radiator.
InspectionELS0020L
LEVEL CHECK

Check if the reservoir tank engine coolant level is within the
“MIN” to “MAX” range when engine is cool.

Adjust the engine coolant level as necessary.
CHECKING COOLING SYSTEM FOR LEAKS
To check for leaks, apply pressure to the cooling system using Tool.
WA RN ING:
Never remove the radiator cap when the engine is hot. Serious
burns could occur from high pressure coolant escaping from
the radiator.
CAUTION:
Higher pressure than specified may cause radiator damage.
Checking Fuel LinesELS001XZ
Inspect fuel lines, fuel filler cap and fuel tank for improper attach-
ment, leaks, cracks, damage, loose connections, chafing or deterio-
ration.
If necessary, repair or replace damaged parts.
SM A41 2B
Tool number : EG17650301 (J-33984-A)
Testing pressure
: 157 kPa (1.6 kg/cm
2 , 23 psi)
WBIA0568E
SM A80 3A

MTC-2Revision: June 20062007 Versa CHECKING TEMPERATURE DECREASE ......... 33
CHECKING TEMPERATURE INCREASE .......... 33
CHECKING A/C SWITCH (IF EQUIPPED) ......... 33
CHECKING DEFROST A/C SWITCH (IF
EQUIPPED) ......................................................... 33
Mode Door .............................................................. 34
INSPECTION FLOW ........................................... 34
Air Mix Door ............................................................ 35
INSPECTION FLOW ........................................... 35
Intake Door ............................................................. 36
INSPECTION FLOW ........................................... 36
Blower Motor Circuit ............................................... 37
INSPECTION FLOW ........................................... 37
DIAGNOSTIC PROCEDURE FOR BLOWER
MOTOR ............................................................... 38
Magnet Clutch Circuit (If Equipped) ........................ 41
INSPECTION FLOW ........................................... 41
SYSTEM DESCRIPTION .................................... 42
DIAGNOSTIC PROCEDURE FOR MAGNET
CLUTCH .............................................................. 42
Insufficient Cooling ................................................. 50
INSPECTION FLOW ........................................... 50
PERFORMANCE TEST DIAGNOSIS ................. 52
PERFORMANCE CHART ................................... 54
TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
SURE ................................................................... 55
Insufficient Heating ................................................. 58
INSPECTION FLOW ........................................... 58
Noise ...................................................................... 60
INSPECTION FLOW ........................................... 60
CONTROLLER .......................................................... 61
Removal and Installation ........................................ 61
REMOVAL ........................................................... 61
INSTALLATION .................................................... 61
Disassembly and Assembly .................................... 62
THERMO CONTROL AMPLIFIER ............................ 63
Removal and Installation ........................................ 63
REMOVAL ........................................................... 63
INSTALLATION .................................................... 63
A/C UNIT ASSEMBLY .............................................. 64
Removal and Installation ........................................ 64
REMOVAL ........................................................... 64
INSTALLATION .................................................... 65
Disassembly and Assembly .................................... 66
BLOWER MOTOR .................................................... 68
Removal and Installation ........................................ 68
REMOVAL ........................................................... 68
INSTALLATION .................................................... 68
INTAKE DOOR .......................................................... 69
Intake Door Cable Adjustment ................................ 69
AIR MIX DOOR ......................................................... 70
Air Mix Door Cable Adjustment .............................. 70
MODE DOOR ............................................................ 71
Mode Door Cable Adjustment ................................ 71
BLOWER FAN RESISTOR ....................................... 72
Removal and Installation ........................................ 72
REMOVAL ........................................................... 72
INSTALLATION .................................................... 72HEATER CORE .........................................................73
Removal and Installation .........................................73
REMOVAL ............................................................73
INSTALLATION ....................................................73
AIR CONDITIONER FILTER .....................................74
Removal and Installation .........................................74
FUNCTION ..........................................................74
REPLACEMENT TIMING ....................................74
REPLACEMENT PROCEDURES ........................74
DUCTS AND GRILLES .............................................75
Removal and Installation .........................................75
CENTER VENTILATOR GRILLES .......................76
SIDE VENTILATOR GRILLES (LH/RH) ...............76
DEFROSTER NOZZLE AND SIDE
DEFROSTER DUCTS (LH/RH) ...........................77
SIDE VENTILATOR DUCTS ................................77
CENTER VENTILATOR DUCTS .........................78
SIDE FOOT DUCTS ............................................78
FLOOR DUCTS ...................................................78
REFRIGERANT LINES .............................................80
HFC-134a (R-134a) Service Procedure ..................80
SETTING OF SERVICE TOOLS AND EQUIP-
MENT ...................................................................80
Components ............................................................82
Removal and Installation of Compressor ................84
REMOVAL ............................................................84
INSPECTION FOR CLUTCH DISC TO PULLEY
CLEARANCE .......................................................85
INSTALLATION ....................................................85
Removal and Installation of Low-pressure Flexible
Hose ........................................................................85
REMOVAL ............................................................85
INSTALLATION ....................................................86
Removal and Installation of High-pressure Flexible
Hose ........................................................................86
REMOVAL ............................................................86
INSTALLATION ....................................................87
Removal and Installation of High-pressure Pipe .....87
REMOVAL ............................................................87
INSTALLATION ....................................................87
Removal and Installation of Refrigerant Pressure
Sensor .....................................................................88
REMOVAL ............................................................88
INSTALLATION ....................................................88
Removal and Installation of Condenser ..................88
REMOVAL ............................................................88
INSTALLATION ....................................................88
Removal and Installation of Liquid Tank .................89
REMOVAL ............................................................89
INSTALLATION ....................................................89
Removal and Installation of Evaporator ..................90
REMOVAL ............................................................90
INSTALLATION ....................................................90
Removal and Installation of Expansion Valve .........91
REMOVAL ............................................................91
INSTALLATION ....................................................91
Checking for Refrigerant Leaks ..............................92
Checking System for Leaks Using the Fluorescent
Leak Detector ..........................................................92

MTC-18
OIL
Revision: June 20062007 Versa
OILPFP:KLG00
Maintenance of Oil Quantity in CompressorEJS00579
The oil in the compressor circulates through the system with the refrigerant. Add oil to compressor when
replacing any component or after a large refrigerant leakage occurred. It is important to maintain the specified
amount.
If oil quantity is not maintained properly, the following malfunctions may result:

Lack of oil: May lead to a seized compressor.

Excessive oil: Inadequate cooling (thermal exchange interference)
OIL
OIL RETURN OPERATION
Adjust the oil quantity according to the test group shown below.
1. CHECK OIL RETURN OPERATION
Can oil return operation be performed?

A/C system works properly.

There is no evidence of a large amount of oil leakage.
CAUTION:
If excessive oil leakage is noted, do not perform the oil return operation.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
2. PERFORM OIL RETURN OPERATION, PROCEEDING AS FOLLOWS
1. Start engine, and set the following conditions:
–Engine speed: Idling to 1,200 rpm
–A/C blower switch: ON
–Blower speed: Max. position
–Temp. control: Optional [Set so that intake air temperature is 25° to 30°C (77° to 86° F)].
–Intake position: Recirculation (REC)
2. Perform oil return operation for about 10 minutes.
3. Stop engine.
>> GO TO 3.
3. CHECK REPLACEMENT PART
Should the compressor be replaced?
YES >> GO TO MTC-19, "OIL ADJUSTING PROCEDURE FOR COMPRESSOR REPLACEMENT" .
NO >> GO TO MTC-19, "
OIL ADJUSTING PROCEDURE FOR COMPONENTS REPLACEMENT
EXCEPT COMPRESSOR" . TYPE 1 Compressor (CR-10) : NISSAN A/C System Oil Type R
TYPE 2 Compressor (CSV511) : NISSAN A/C System Oil Type S

TROUBLE DIAGNOSIS
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Component Parts and Harness Connector LocationEJS0057G
ENGINE COMPARTMENT
Insufficient cooling Go to Trouble Diagnosis Procedure for Insufficient Cooling.MTC-50
Insufficient heating Go to Trouble Diagnosis Procedure for Insufficient Heating.MTC-58
Noise Go to Trouble Diagnosis Procedure for Noise.MTC-60
Symptom Reference Page
1. Refrigerant pressure sensor E17 2. A/C compressor F3
WJIA2235E

TROUBLE DIAGNOSIS
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Operational CheckEJS0057J
The purpose of the operational check is to confirm that the system operates properly.
CHECKING BLOWER
1. Turn blower control dial clockwise to "1" position. Blower should operate on low speed.
2. Turn blower control dial clockwise to "2" position, and continue checking blower speed until all speeds are
checked.
3. Leave blower on Maximum speed.
If NG, go to trouble diagnosis procedure for MTC-37, "
Blower Motor Circuit" .
If OK, continue the check.
CHECKING DISCHARGE AIR
1. Turn mode door control dial to each position.
2. Confirm that discharge air comes out according to the air distribution table. Refer to MTC-22, "
Discharge
Air Flow" .
If NG, go to trouble diagnosis procedure for MTC-34, "
Mode Door" .
If OK, continue the check.
CHECKING RECIRCULATION
1. Set intake door lever to REC position.
2. Operate intake door lever to FRE position.
3. Listen for intake door position change (you should hear blower sound change slightly).
If NG, go to trouble diagnosis procedure for MTC-36, "
Intake Door" .
If OK, continue the check.
CHECKING TEMPERATURE DECREASE
1. Turn temperature control dial counterclockwise to full cold position.
2. Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for MTC-50, "
Insufficient Cooling" .
If OK, continue the check.
CHECKING TEMPERATURE INCREASE
1. Turn temperature control dial clockwise to full hot position.
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for MTC-58, "
Insufficient Heating" .
If OK, continue the check.
CHECKING A/C SWITCH (IF EQUIPPED)
1. Turn fan control dial to the desired (1 to 4 speed) position.
2. Press A/C switch.
3. A/C switch indicator will turn ON.

Confirm that the compressor clutch engages (sound or visual inspection).
If NG, go to trouble diagnosis procedure for MTC-41, "
Magnet Clutch Circuit (If Equipped)" .
If OK, continue the check.
CHECKING DEFROST A/C SWITCH (IF EQUIPPED)
1. Turn fan control dial to the desired (1 to 4 speed) position.
2. Turn mode dial to ( ) DEF.
3. Confirm that the compressor clutch engages (sound or visual inspection).
If NG, go to trouble diagnosis procedure for MTC-41, "
Magnet Clutch Circuit (If Equipped)" .
If all operational checks are OK (symptom cannot be duplicated), go to MTC-24, "
How to Perform Trouble
Diagnosis for Quick and Accurate Repair" and perform tests as outlined. If symptom appears, refer to MTC-
24, "SYMPTOM TABLE" and perform applicable trouble diagnosis procedures. Conditions : Engine running at normal operating temperature

MTC-50
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
Insufficient CoolingEJS0057P
SYMPTOM: Insufficient cooling
INSPECTION FLOW
1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE
1. Turn temperature control dial counterclockwise to maximum cold position.
2. Check for cold 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-33, "
Operational Check" .
Does another symptom exist?
YES >> Refer to MTC-24, "SYMPTOM TABLE" .
NO >> System OK.
3. CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4. CHECK COMPRESSOR DRIVE BELT TENSION
Check compressor belt tension. Refer to EM-13, "
Checking Drive Belts" .
OK or NG
OK >> GO TO 5.
NG >> Adjust or replace compressor belt. Refer to EM-13, "
Removal and Installation" .
5. CHECK AIR MIX DOOR CABLE
Check and verify air mix door cable operation. Refer to MTC-70, "
Air Mix Door Cable Adjustment" .
Does air mix door operate correctly?
YES >> GO TO 6.
NO >> Repair or replace as necessary.
6. CHECK COOLING FAN MOTOR OPERATION
Check and verify cooling fan motor for smooth operation. Refer to EC-443, "
System Description" .
Does cooling fan motor operate correctly?
YES >> GO TO 7.
NO >> Check cooling fan motor. Refer to EC-443, "
DTC P1217 ENGINE OVER TEMPERATURE" .
7. CHECK FOR EVAPORATOR FREEZE UP
Start engine and run A/C. Check for evaporator freeze up.
Does evaporator freeze up?
YES >> Perform performance test diagnoses. Refer to MTC-52, "PERFORMANCE TEST DIAGNOSIS" .
NO >> GO TO 8.

TROUBLE DIAGNOSIS
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TROUBLE DIAGNOSIS FOR UNUSUAL PRESSURE
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
High-pressure Side is Too High and Low-pressure Side is Too Low
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure
sides are too high.Pressure is reduced soon
after water is splashed on
condenser.Excessive refrigerant charge in
refrigeration cycle.Reduce refrigerant until
specified pressure is
obtained.
Air suction by cooling fan is
insufficient.Insufficient condenser cooling perfor-
mance.
↓
1. Condenser fins are clogged.
2. Improper fan rotation of cooling
fan.

Clean condenser.

Check and repair cooling
fan if necessary.

Low-pressure pipe is not
cold.

When compressor is
stopped high-pressure
value quickly drops by
approximately 196 kPa
(1.96 bar, 2 kg/cm
2 , 28
psi). It then decreases
gradually thereafter.Poor heat exchange in condenser
(After compressor operation stops,
high-pressure decreases too
slowly.).
↓
Air in refrigeration cycle.Evacuate repeatedly and
recharge system.
Engine tends to overheat. Engine cooling systems malfunction.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 discharge
flow.

Expansion valve is open a little
compared with the specification.
↓
Improper expansion valve adjust-
ment.Replace expansion valve.
AC359A
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 located
between compressor and condenser
are clogged or crushed.

Check and repair or
replace malfunctioning
parts.

Check oil for contami-
nation.
AC360A

TROUBLE DIAGNOSIS
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Low-pressure Side Sometimes Becomes Negative
Low-pressure Side Becomes Negative
Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side sometimes
becomes negative.

Air conditioning system
does not function and does
not cyclically cool the com-
partment air.

The system constantly func-
tions for a certain period of
time after compressor is
stopped and restarted.Refrigerant does not dis-
charge cyclically.
↓
Moisture is frozen at expan-
sion valve outlet and inlet.
↓
Water is mixed with refriger-
ant.

Drain water from refrigerant
or replace refrigerant.

Replace liquid tank.
AC354A
Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side becomes nega-
tive.
Liquid tank or front/rear side of
expansion valve’s pipe is
frosted 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
water freezes causing a
blockage. Drain water from
refrigerant or replace refrig-
erant.

If due to foreign particles,
remove 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