Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Nissan 300ZX 1984-1985,1988,1990,1994-1996 Approved 1984 Heater & AC

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HEATER &
I
__I_--
CONDITIONER
AIRv

SECTION HA^ I

CONTENTS
GENERAL DESCR IPTlON . ... . . . HA- 2
AIR FLOW AND COMPONENT LAYOUT . .. . .. HA- 3
LOCATION OF VACUUM COMPONENTS ... HA- 5
DOOR CONTROL .. 1 . . .. HA- 6

HEATER ELECTRICAL CIRCUIT. . . . . .. HA- 7

DESCRIPTION-Air Conditioner (Manual) . ... .. HA- 9
DISCHARGING, EVACUATING, CHARGING AND CHECKING HA-12
A/C PERFORMANCE TEST . . HA-18
PRECAUTIONS FOR REFRIGERANT CONNECTION . HA-20
PIPING, COMPRESSOR MOUNTING AND F.1 C D. . HA-21
COMPRESSOR OIL-ForMJS170 . . .. . . HA-23
COMPRESSOR-Model MJS170 . . . . HA-25
A/C ELECTRICAL CIRCUIT (Manual) . .. .. . HA-30
A/C ELECTRICAL COMPONENTS (Manual) . . .. HA-32
LOCATION OF A/C ELECTRICAL COMPONENTS .... . HA-34
SERVICE DATA AND SPECIFICATIONS (S D S ) . . . . HA-35
SPECIAL SERVICE TOOLS .. . . . HA-38
GENERAL DESCRIPTION
Continuously Variable -Device for Distributing Cool Air -
Air Flow Control to the Feet during " FACE MODE "

The fan control amplifier, which utilizes transistor A vacuum actuator is used in the cool-air distribu-
circuits, continuously controls the air flow blown tion device t o remove the hot air directed t o the
out by the blower, allowing for selection o f the de- floor area and distribute the optimum air tempera-
sired air flowrate. The fan control amplifier IS ture t o the driver's compartment When the vac-
housed in the blower motor unit. The heat-radiat- uum switch is turned "ON", part of the outside air
ing plate of the amplifier is placed in the stream of (or part of the cool air on models equipped with
the air flow t o effectively cool the transistors air conditioning systems) taken in the vehicle i s
bypassed t o the shower duct on the driver's side
BLOWER MOTOR
To blower relay through the operation of the actuator
M

- __4;-..2
II

FAN CONTROL AMPLIFIER
POWER TRANSISTOR
4
'Shower-ty pe nozzle
Vacuum s w f c h
IFloor ventilator Open-Close)
SHA255B (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 FUSIBLE
LINK

FEEDBACK
POTENT10
1
TEMPERATURE
SEmlNG
POTENT10
4
BLOWER
RELAY

I I

For water cock

For intake actuator

-
For floor door actuator

For v e m i l a ~ u a t o r

Far d e f r o s -

D S V V IForawmtxdoor)

D S V V 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
4
4
Blower motor
-_ (38 kg/cm'. 540 psi)
The valve cannot be reused
..

v
I

Receiver drier

Delivers sprayed refrlgerant to the
evaporator to facilitate refrigerant
Turns OFF at pressures below 196 kPa evaporation and controls the amount
(2 kglcm', 28 psi1 cutting compressor power supply of refrigerant passing the orifice

SHA238B
DESCRIPTION-Air Conditioner (Manual)
Refrigerant Leak Warning System

The refrigerant leak warning system, used in con- When the refrigerant in the cooler cycle is insuffi-
junction with the low-pressure switch, protects the cient, it vaporizes quickly inside the evaporator As
cooler cycle from damage due t o continued opera- a result, the "super heat" of the refrigerant a t the
tion o f the air conditioning system when there is a outlet of the evaporator increases If it exceeds the
shortage of refrigerant It also indicates when t o re- specified level [Approximately 45

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