cooling NISSAN 350Z 2007 Z33 Automatic Air Conditioner User Guide

ATC-94
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
COMPONENT INSPECTION
Ambient Sensor
After disconnecting ambient sensor connector E34, measure resis-
tance between terminals 1 and 2 at sensor side. Refer to the table
below.
If NG, replace ambient sensor.
In-vehicle Sensor CircuitNJS0001B
COMPONENT DESCRIPTION
In-vehicle Sensor
The in-vehicle sensor is located on instrument driver panel lower. It
converts variations in temperature of compartment air drawn from
the aspirator into a resistance value. It is then input into the unified
meter and A/C amp.
Aspirator
The aspirator is located on driver’s side of heater & cooling unit
assembly. It produces vacuum pressure due to air discharged from
the heater & cooling unit assembly, continuously taking compartment
air in the aspirator.
Temperature °C (°F) Resistance kΩ
−15 (5) 12.73
−10 (14) 9.92
−5 (23) 7.80
0 (32) 6.19
5 (41) 4.95
10 (50) 3.99
15 (59) 3.24
20 (68) 2.65
25 (77) 2.19
30 (86) 1.81
35 (95) 1.51
40 (104) 1.27
45 (113) 1.07
RJIA2139E
PJIA0168E
RJIA1401E

ATC-100
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
Intake Sensor CircuitNJS0001D
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor is located on the heater & cooling unit assembly. It
converts temperature of air after it passes through the evaporator
into a resistance value which is then input to the unified meter and A/
C amp.
DIAGNOSIS PROCEDURE FOR INTAKE SENSOR
SYMPTOM: Intake sensor circuit is open or shorted. (LED of A/C
switch does not illuminate as a result of performing self-diagnosis
STEP-2.)
1. CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND
1. Disconnect intake sensor connector.
2. Turn ignition switch ON.
3. Check voltage between intake sensor harness connector M255
terminal 2 and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 4.
2. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect unified meter and A/C amp. connector.
3. Check continuity between intake sensor harness connector
M255 terminal 1 and unified meter and A/C amp. harness con-
nector M50 terminal 49.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
RJIA1406E
RJIA1458E
2 – Ground : Approx. 5 V
RJIA2031E
1 – 49 : Continuity should exist.
RJIA2032E

ATC-112
HEATER & COOLING UNIT ASSEMBLY
Revision: 2006 November2007 350Z
HEATER & COOLING UNIT ASSEMBLYPFP:27110
Removal and InstallationNJS0001O
REMOVAL
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.
2. Drain coolant from cooling system. Refer to CO-10, "
Changing Engine Coolant" .
3. Remove cowl top cover. Refer to EI-20, "
COWL TOP" .
4. Disconnect one-touch joint between low-pressure pipe 1 (1) and
low-pressure pipe 2 (2) with disconnector (SST: 9253089916)
(A).
CAUTION:
Cap or wrap the joint of low-pressure pipe 1 and low-pres-
sure pipe 2 with suitable material such as vinyl tape to
avoid the entry of air.
5. Disconnect one-touch-joint between high-pressure pipe 1 (3)
and high-pressure pipe 2 (4) with disconnector (SST:
9253089908) (A).
CAUTION:
Cap or wrap the joint of high-pressure pipe 1 and high-pres-
sure pipe 2 with suitable material such as vinyl tape to avoid the entry of air.
6. Remove clamps (A), and then disconnect two heater hoses (1) from heater core.
7. Remove instrument panel. Refer to IP-10, "
INSTRUMENT PANEL ASSEMBLY" .
8. Remove blower unit. Refer to ATC-108, "
BLOWER UNIT" .
9. Remove clips of vehicle harness from steering member.
10. Remove mounting nuts and bolts, and then remove instrument stays (left and right).
11. Remove defroster nozzle and ventilator ducts. Refer to ATC-121, "
Removal of Defroster Nozzle, Ducts
and Ventilator Ducts" .
PJIA0176E
PJIA0177E
RJIA1418E

HEATER & COOLING UNIT ASSEMBLY
ATC-113
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2006 November2007 350Z
12. Remove mounting bolts from heater & cooling unit assembly.
13. Remove steering column assembly mounting nuts and bolt.
14. Remove steering member mounting bolts, and then remove steering member.
15. Remove heater & cooling unit assembly.
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:

Replace O-rings of low-pressure pipe 2 and high-pressure pipe 1 with new ones, and then apply
compressor oil to it when installing it.

Female-side piping connection is thin and easy to deform. Slowly insert the male-side piping
straight in axial direction.

Insert piping securely until a click is heard.

After piping connection is completed, pull male-side piping by hand to make sure that connection
does not come loose.

When recharging refrigerant, check for leaks.
NOTE:

When filling radiator with coolant, refer to CO-10, "Changing Engine Coolant" .

Recharge the refrigerant.
SJIA1221E
SJIA1222E
Heater & cooling unit assembly mounting bolts
: 6.9 N·m (0.7 kg-m, 61 in-lb)
Steering member and steering column assembly mounting nuts and bolt
: 12 N·m (1.2 kg-m, 9 ft-lb)

ATC-114
HEATER & COOLING UNIT ASSEMBLY
Revision: 2006 November2007 350Z
Disassembly and AssemblyNJS0001P
1. Heater pipe grommet 2. Heater core 3. Heater pipe cover
4. Aspirator 5. Aspirator duct 6. Rear foot cover
7. Max. cool door link 8. Max. cool door lever 9. Ventilator door lever
10. Ventilator door link 11. Air mix door motor 12. Intake sensor
13. Foot duct (right) 14. Evaporator cover 15. Evaporator cover adapter
16. Heater pipe bracket 17. Insulator 18. Heater case (right)
SJIA1897E

HEATER & COOLING UNIT ASSEMBLY
ATC-115
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2006 November2007 350Z
19. Low-pressure pipe 1 20. High-pressure pipe 2 21. O-ring
22. Expansion valve 23. Evaporator 24. Heater case (left)
25. Foot duct (left) 26. Air mix door (slide door) 27. Ventilator door
28. Side link 29. Mode door motor 30. Intake sensor bracket
31. Defroster door 32. Max. cool door 33. Defroster door lever
34. Defroster door link
: N·m (kg-m, in-lb)
: Always replace after every disassembly.

ATC-118
HEATER CORE
Revision: 2006 November2007 350Z
HEATER COREPFP:27140
Removal and InstallationNJS0001S
REMOVAL
1. Remove heater & cooling unit assembly. Refer to AT C - 11 2 , "HEATER & COOLING UNIT ASSEMBLY" .
2. Remove foot duct (left). Refer to ATC-122, "
Removal of Foot Ducts" .
3. Remove mounting screws, and then remove heater pipe cover.
4. Remove heater pipe bracket and heater pipe grommet.
5. Slide heater core to leftward.
INSTALLATION
Installation is basically the reverse order of removal.
RJIA2142E

ATC-122
DUCTS AND GRILLES
Revision: 2006 November2007 350Z
Removal of Foot Ducts
1. Remove heater & cooling unit assembly. Refer to AT C - 11 2 , "HEATER & COOLING UNIT ASSEMBLY" .
2. Remove evaporator cover, and then remove foot duct (right).
3. Remove aspirator and heater pipe cover.
4. Remove mounting clips, and then remove foot duct (left).
INSTALLATION
Installation is basically the reverse order of removal.
RJIA1429E

REFRIGERANT LINES
ATC-135
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2006 November2007 350Z
Removal and Installation of Refrigerant Pressure SensorNJS00024
REMOVAL
1. Remove liquid tank. Refer to ATC-132, "Removal and Installation of Liquid Tank" .
2. Using a vise, secure liquid tank, and then remove refrigerant
pressure sensor.
CAUTION:
When working, be careful not to damage condenser.
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:

Apply compressor oil to the O-ring of the refrigerant pressure sensor when installing it.

When recharging refrigerant, check for leaks.
Removal and Installation of EvaporatorNJS00025
REMOVAL
1. Remove low-pressure pipe 1 and high-pressure pipe 2. Refer to ATC-131, "Removal and Installation of
Low-pressure Pipe 1 and High-pressure Pipe 2" .
CAUTION:
Cap or wrap the joint of evaporator, low-pressure pipe 1, 2 and high-pressure pipe 1, 2 with suit-
able material such as vinyl tape to avoid the entry of air.
2. Slide evaporator, and then remove it from heater & cooling unit
assembly.
3. Remove intake sensor from evaporator, and then remove evap-
orator.
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:

Replace O-rings of low-pressure pipe 1, 2 and high-pressure pipe 1, 2 with new ones, and then
apply compressor oil to it when installing it.

Female-side piping connection is thin and easy to deform. Slowly insert the male-side piping
straight in axial direction.

Insert piping securely until a click is heard.

After piping connection is completed, pull male-side piping by hand to make sure that connection
does not come loose.

O-rings are different from low-pressure pipe 1 (high-pressure pipe 1) and low-pressure pipe 2
(high-pressure pipe 2).

Mark the mounting position of intake sensor bracket prior to removal so that the reinstalled sen-
sor can be located in the same position.

When recharging refrigerant, check for leaks.
RJIA2148E
RJIA1406E

ATC-140
REFRIGERANT LINES
Revision: 2006 November2007 350Z
CHECKING PROCEDURE
To prevent inaccurate or false readings, make sure there is no refrigerant vapor, shop chemicals, or cigarette
smoke in the vicinity of the vehicle. Perform the leak test in calm area (low air/wind movement) so that the
leaking refrigerant is not dispersed.
1. Stop the engine.
2. Connect a suitable A/C manifold gauge set (SST:J-39183) to the A/C service valves.
3. Check if the A/C refrigerant pressure is at least 345 kPa (3.52 kg/cm
2 , 50 psi) above 16°C (61°F). If less
than specification, recover/evacuate and recharge the system with the specified amount of refrigerant.
NOTE:
At temperatures below 16°C (61°F), leaks may not be detected since the system may not reach 345 kPa
(3.52 kg/cm
2 , 50 psi).
4. Perform the leak test from the high-pressure side (compressor discharge a to evaporator inlet g) to the
low-pressure side (evaporator drain hose h to shaft seal l). Refer to ATC-125, "
Components" . Perform a
leak check for the following areas carefully. Clean the component to be checked and move the leak
detected probe completely around the connection/component.
Compressor
Check the fitting of high- and low-pressure flexible hoses, relief valve and shaft seal.
Condenser
Check the fitting of high-pressure flexible hose and pipe.
Liquid tank
Check the fitting of refrigerant connection.
Service valves
Check all around the service valves. Ensure service valve caps are secured on the service valves (to pre-
vent leaks).
NOTE:
After removing A/C manifold gauge set from service valves, wipe any residue from valves to prevent any
false readings by leak detector.
Cooling unit (Evaporator)
With engine OFF, turn blower fan on “High” for at least 15 seconds to dissipate any refrigerant trace in the
cooling unit. Wait a minimum of 10 minutes accumulation time (refer to the manufacturer’s recommended
procedure for actual wait time) before inserting the leak detector probe into the drain hose.
Keep the probe inserted for at least 10 seconds. Use caution not to contaminate the probe tip with water
or dirt that may be in the drain hose.
5. If a leak detector detects a leak, verify at least once by blowing compressed air into area of suspected
leak, then repeat check as outlined above.
6. Do not stop when one leak is found. Continue to check for additional leaks at all system components.
If no leaks are found, perform steps 7 - 10.
7. Start the engine.
8. Set the A/C control as follows;
a. A/C switch: ON
b. MODE door position: VENT (Ventilation)
c. Intake door position: Recirculation
d. Temperature setting: Max. cold
e. Fan speed: High
9. Run engine at 1,500 rpm for at least 2 minutes.
10. Stop the engine and perform leak check again following steps 4
through 6 above.
Refrigerant leaks should be checked immediately after stopping
the engine. Begin with the leak detector at the compressor. The
pressure on the high-pressure side will gradually drop after
refrigerant circulation stops and pressure on the low-pressure
side will gradually rise, as shown in the graph. Some leaks are
more easily detected when pressure is high.
SHA839E