NISSAN 300ZX 1984 Z31 Heather And Air Conditioner Workshop Manual

HEATER &
AIR CONDITIONER
I v __I_--
SECTION HA^ I
CONTENTS
GENERAL DESCR I PTlON . ... .. . HA- 2
AIR FLOW AND COMPONENT LAYOUT
. .. . .. HA- 3
DOOR CONTROL .. 1.. .. HA- 6
LOCATION OF VACUUM COMPONENTS ... HA- 5
HEATER ELECTRICAL CIRCUIT. . . . . .. HA- 7
DESCRIPTION-Air Conditioner (Manual) . ... ..
A/C PERFORMANCE TEST ..
DISCHARGING, EVACUATING, CHARGING AND CHECKING
PRECAUTIONS FOR REFRIGERANT CONNECTION .
PIPING, COMPRESSOR MOUNTING AND F.1 C D.
COMPRESSOR OIL-ForMJS170
. . .. ..
COMPRESSOR-Model MJS170 .. ..
A/C ELECTRICAL CIRCUIT (Manual) . .. ..
A/C ELECTRICAL COMPONENTS (Manual) ..
LOCATION OF A/C ELECTRICAL COMPONENTS ....
SERVICE DATA AND SPECIFICATIONS (S D S ) . .
SPECIAL SERVICE TOOLS .. ..
HA- 9
HA-12
HA-18
HA-20
. HA-21
HA-23
HA-25
. HA-30
.. HA-32
. HA-34
.. HA-35
. HA-38

GENERAL DESCRIPTION
Continuously Variable Air Flow Control
The fan control amplifier, which utilizes transistor
circuits, continuously controls the air flow blown
out
by the blower, allowing for selection of the de-
sired air flowrate. The fan control amplifier
IS
housed in the blower motor unit. The heat-radiat-
ing plate of the amplifier
is placed in the stream of
the air flow to effectively cool the transistors
BLOWER MOTOR To blower relay M
AT AT
I - I __4;-..2 POWER TRANSISTOR
FAN CONTROL AMPLIFIER SHA255B
-Device for Distributing Cool Air -
to the Feet during " FACE MODE "
A vacuum actuator is used in the cool-air distribu-
tion device to remove the hot
air directed to the
floor area and distribute the optimum air tempera-
ture to the driver's compartment When the vac-
uum switch
is turned "ON", part of the outside air
(or part of the cool air on models equipped with
air conditioning systems) taken in the vehicle is
bypassed to the shower duct on the driver's side
through the operation of the actuator
4 Vacuum swfch IFloor ventilator Open-Close) 'Shower-ty pe nozzle (Driver sidel
Vacuum hose
a
HA-2

AIR FLOW AND COMPONENT LAYOUT
Air Flow
SHA231B
HA-3

AIR FLOW AND COMPONENT LAYOUT
Component Layout
SHA232B
HA-4

LOCATION OF VACUUM COMPONENTS
\Vacuum tank
Vacuum pump motor
SHA2338
HA-5

DOOR CONTROL
Heater and Air Conditioner Control Removal
PROCEDURES
Remove each screw in the number order shown in the following illustration.
Radiolaw condnmner bracket f
SHA234B
HA-6

HEATER ELECTRICAL CIRCUIT
Schematic
BATTERY
FEEDBACK
POTENT10
TEMPERATURE
SEmlNG POTENT10
I I
For water cock
FUSIBLE
LINK
1
4
BLOWER
RELAY
For intake actuator
For floor door actuator
For vemila~uator
Far defros-
DSVV IForawmtxdoor)
DSVV IForairmrxdoorl -
a
SHA236B
HA-7

HEATER ELECTRICAL CIRCUIT
Wiring Diagram
SHA237B
HA-8

DESCRIPTION-Air Conditioner (Manual)
Refrigeration Cycle
Condenser
Safety valve Discharger refrigerant to
atmosphere at pressures above approx 3,727 kPa (38 kg/cm'. 540 psi) The valve cannot be reused -_ ..
Receiver drier
Delivers sprayed refrlgerant to the
evaporator to facilitate refrigerant
evaporation and controls the amount
of refrigerant passing the orifice
Turns OFF at pressures below 196 kPa (2 kglcm', 28 psi1 cutting compressor power supply
v
I
44
Blower motor
SHA238B

DESCRIPTION-Air Conditioner (Manual)
Refrigerant Leak Warning System
The refrigerant leak warning system, used in con-
junction with the low-pressure switch, protects the
cooler cycle from damage due to continued opera-
tion of the
air conditioning system when there is a
shortage of refrigerant
It also indicates when to re-
plenish the refrigerant
Refrigerant leak
warnmg lamp Recirculation switch
Air conditioner switch
control lever
SHA227B
I ll I
SHA2286
When the refrigerant in the cooler cycle is insuffi-
cient,
it vaporizes quickly inside the evaporator As
a result, the "super heat" of the refrigerant at the
outlet of the evaporator increases
If it exceeds the
specified level [Approximately 45°C
(8l0F)1, the
super heat switch turns on, allowing the current to
flow through the timer If current continues to
flow through the timer for the specified length of
time, the timer activates to close the contacts
which turn on the warning lamp
Leak warning lamp check
Conduct a continuity test in the leak warning lamp
circuit.
1) Turn ignition switch "ON" (with engine off) to
make sure warning lamp illuminates.
2) Start engine. Warning lamp should go out if the
amount of refrigerant
is sufficient.
EXPLANATION OF SUPER HEAT
When a liquid under constant pressure inside a
cylinder is heated, it apparently changes in three
different
states The relationship between the tem-
perature of the liquid (refrigerant) and
its volume,
which
uses the pressure as a parameter, is shown in
the graph below.
1) The temperature of the liquid rises along the
saturated liquid line (a -+ b or a + b')
2) When the temperature of the liquid reaches a
certain level, evaporating bubbles quickly ap-
pear This mixture of liquid and vapor contin-
ues to take place, during which the tempera-
ture remains constant until the
last droplet of
liquid vaporizes. Points c and c' where the
entire liquid vaporizes, are located on the
saturated vapor line (b
+ c or b -+ c').
3) When the liquid is further heated, the tempera-
ture of the vapor
rises again and its volume also
increases.
The volume will continue to increase
as the temperature is increased
We call this vapor "super heated vapor" (c + d
or c'
+ d')
The line between points c and c'
is called the
"saturated vapor line."
HA-I 0