engine coolant NISSAN 350Z 2007 Z33 Automatic Air Conditioner Workshop Manual

ATC-26
AIR CONDITIONER CONTROL
Revision: 2006 November2007 350Z
Stop Signal:
At the end of each transmission, a stop operation, in-operation, or internal malfunction message is delivered to
the unified meter and A/C amp. This completes one data transmission and control cycle.
AIR MIX DOOR CONTROL (AUTOMATIC TEMPERATURE CONTROL)
The air mix door is automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by the temperature setting, ambient temperature, in-vehicle temperature and amount of sunload.
FAN SPEED CONTROL
Blower speed is automatically controlled by the temperature setting, ambient temperature, in-vehicle tempera-
ture, intake temperature, amount of sunload and air mix door position.
With FAN control dial set to AUTO, the blower motor starts to gradually increase air flow volume.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-
ing.
INTAKE DOOR CONTROL
The intake doors are automatically controlled by the temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature, amount of sunload and ON/OFF operation of the compressor.
MODE DOOR CONTROL
The mode door is automatically controlled by the temperature setting, ambient temperature, in-vehicle temper-
ature, intake temperature and amount of sunload.
RJIA2100E

ATC-70
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
SYSTEM DESCRIPTION
Component Parts
Fan speed control system components are:

Unified meter and A/C amp.

A/C LAN system (PBR built-in mode door motor, air mix door motor and intake door motor)

In-vehicle sensor

Ambient sensor

Sunload sensor

Intake sensor
System Operation
Automatic Mode
In the automatic mode, the blower motor speed is calculated by the unified meter and A/C amp. based on the
input from the PBR, in-vehicle sensor, sunload sensor, intake sensor and ambient sensor.
When the air flow is increased, the duty ratio of the blower motor’s drive signal is changed at 8%/sec. to pre-
vent a sudden increase in air flow.
In addition to manual air flow control and the usual automatic air flow control, starting air flow control, low
water temperature starting control and high passenger compartment temperature starting control are avail-
able.
Starting Fan Speed Control
Start up from COLD SOAK Condition (Automatic mode)
In a cold start up condition where the engine coolant temperature is below 56°C (133°F), the blower will not
operate for a short period of time (up to 150 seconds). The exact start delay time varies depending on the
ambient and engine coolant temperature.
In the most extreme case (very low ambient) the blower starting delay will be 150 seconds as described
above. After this delay, the blower will operate at low speed until the engine coolant temperature rises above
56°C (133°F), and then the blower speed will increase to the objective speed.
Start up from usual or HOT SOAK Condition (Automatic mode)
The blower will begin operation momentarily after the fan control dial to AUTO position. The blower speed will
gradually rise to the objective speed over a time period of 3 seconds or less (actual time depends on the
objective blower speed).
RJIA1388E

TROUBLE DIAGNOSIS
ATC-89
C
D
E
F
G
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K
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B
AT C
Revision: 2006 November2007 350Z
Insufficient HeatingNJS00017
SYMPTOM: Insufficient heating
INSPECTION FLOW
*1AT C - 5 3 , "Operational Check"*2ATC-46, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 1.*3ATC-46, "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 5 to 7.
*4AT C - 6 3 , "
Air Mix Door Motor Cir-
cuit"
*5ATC-46, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 9.*6ATC-56, "
LAN System Circuit"
*7AT C - 6 9 , "Blower Motor Circuit"*8ATC-63, "Air Mix Door Motor Circuit"*9EC-223, "DTC P0117, P0118 ECT
SENSOR"
*10CO-10, "Changing Engine Coolant"*11CO-15, "Checking Radiator Cap"
SJIA1131E

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
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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)

REFRIGERANT LINES
ATC-133
C
D
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AT C
Revision: 2006 November2007 350Z
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:

Make sure liquid tank bracket is securely installed at protru-
sion of condenser.

Make sure liquid tank bracket does not move to a position
below center of liquid tank.

Replace O-rings of condenser pipe with new ones, and then
apply compressor oil to it when installing it.

When recharging refrigerant, check for leaks.
Removal and Installation of CondenserNJS00023
REMOVAL
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.
2. Drain engine coolant. Refer to CO-10, "
Changing Engine Coolant" .
3. Remove cover for condenser mounting bolt.
4. Remove tower bar. Refer to FSU-20, "
TOWER BAR" .
5. Remove engine cover (1), (2). Refer to EM-17, "
INTAKE MANIFOLD COLLECTOR" .
6. Remove air cleaner case (LH) and air duct (LH). Refer to and EM-15, "
AIR CLEANER AND AIR DUCT" .
7. Remove radiator fan shroud after removing radiator upper hose.
8. Remove mounting bolt for condenser.
9. Remove mounting bolt (A) from high-pressure flexible hose
bracket (1).
10. Disconnect one-touch joint between high-pressure flexible hose
(1) and condenser with disconnector (SST: 9253089912).
CAUTION:
Cap or wrap the high-pressure flexible hose and condenser
with suitable material such as vinyl tape to avoid the entry
of air.
Disconnect one-touch joint between high-pressure pipe 1 (2)
and condenser with disconnector (SST: 9253089908).
CAUTION:
Cap or wrap the joint of high-pressure pipe 1 and con-
denser with suitable material such as vinyl tape to avoid the
entry of air.
RJIA1441E
SJIA0249E
PJIA0183E
PJIA0189E