1979 DATSUN 210 Service Manual

Air

Conditioning

RECEIVER
DRIER

The
receiver

drier
rves
the

pur

pose
of

storing
tl
e

liquid
refrigerant

The
amount

of
the

liquid
refrigerant

flowing
through
the

system
varies

with

the

operating
condition
of
the
air

conditioner
To
be

accurate
the

receiver

drier
stores
excess
amount

of

refrigerant
when
the

heat
load
is

low

ered
It
also
releases

stored

refrigerant

when
additional

cooling
is
needed

thus

maintaining
the

optimum
flow
of

refrigerant
within
the

system

The
receiver

drier
includes
a
strain

er

and
desiccant

They
have
the

job
of

removing
moisture
and

foreign
parti

cles
as
the

refrigerant
circulates
within

the

system

The

pressure
relief
valve
is

installed

beside

the

sight
glass
of
the
receiver

drier

The

purpose
of
the
valve
is

to

release

preSsurized

refrigerant
vapor

into

the

atmosphere
in

the
event
of

excessive

pressure
build

up
in

the

high

pressure
line

The

pressure
relief

valve

opens

automatically
at
a

pressure
of
about

38

kg
cm2
540

psi

EXPANSION
VALVE

The

expansion
valve
restricts
the

flow
of

liquid
refrigerant
as
it

passes

through
it
and

delivers

sprayed
refrig

erant
to
the

evaporator
for

faCilitating

refrigerant

evaporation

The

refrigerani
within

the

sensing

bulb

changes
in

pressure

through
the

super
heat
condit
ion

of

vaporized
re

frigerant
gas
which
comes

out
of

the

evaporator
causing
the

deflection
of

the

diaphragm
The
lift
of
the
ball

valve

attached
to
the

diaphragm
is

changed
by
the
deflection
of

the
dia

phragm
thus

controlling
the

amount

of

refrigerant
passing
the

orifice

AC
4
To

expansion

valve

rl
From
condenser

L
J

C
d

f

@

J

f

J
4
4

1

u

lc

AC167A

1

Pressure
relief
valve

2

Sight
glass

3
Suainer

4
Desiccant

Fig
AC
3
Receiver
Drier

JD

v
t

I

Sensing
bulb

2

Diaphragm

3

Eq
ualizer
line
From
receiver
drier

4

Orifice

5
Valve
ball
To
evaporator

Fig
A
C
4

Expansion
Valve
AC423

Air

Conditioning

AIR
FLOW

Air
control
lever

1M
l

r

I
1
all
IC
1T
I

tCliO

ar

afH
7

Sidedefrostcr

duct
Defroster
nozzle

L
Jf
SOd
Fan
switch

1

7
l

t
I
Air
intake
door

r

If

Ftont
seat
flOO

i
f

t
I

J

Heater

outlet
nside
air

l

Front
seat

floor

Evaporator

i

Side
outlet

D
I
I

IIll
91
i

Side
outlet

Center
udet

r2
D

I

Air
control
Air
mix

door

Ventilation

Blower
Compressor

Air
intake
door

and
Floor
door
and

lever

Water
cock
door
motor

F
1
actuator

OFF
OFF

AIC
Inside
air
100

Open
Closed
ON

VENT
Outside
air
100

Open
Closed
OFF

B
L

Outside
air
100
Controlled

by

0

Open
Open
OFF

temperature
ON

HEAT
Outside
air
100

lever
Closed

Open
OFF

DEF

Outside
air
100

Closed
0

Open
OFF

REC
HEAT
Inside
air
100
Closed

Open
OFF

AC379A

Fig
AC
S
Air
Flow

AC
5

VACUUM
SYSTEM

MAGfilET
VALVE

The

magnet
valve
is

located
be

tween
the

fast
idle
actuator
and

the

intake
manifold
vacuum

con

nector

Valve

cloaed

When
current
to
the
coil
is
inter

rupted

passage
on
the
intake
mani

fold
side

closes

leaving
the

actuator

side

line

open
to
the

atmosphere

Actuator

side

j

I

i

r
1
Filter

2
Return

spring

3
Coil

AC175A
4

Valve

Intake
manifold
side

Fig
AG
6

Magnet
Valve

Glosed

Velve

open

While
the

magnet
valve
coil
is

energized
by
an
electric
current
it

holds
the
valve
needle
in
the

raised

position
and
vacuum
is

imposed
on

the

vacuum
actuator
from
the
intake

manifold
Air

Conditioning

Actuator
side

AC176A
Intake
manifold

side

Fig
AG
7

Magnet
Valve

Open

FAST
IDLE
CONTROL

DEVICE
F
I
C
D

FAST

IDLE
ACTUATOR

The
fast

idle
control
device
in

creases

engine
idle

speed
so
that
the
air

conditioner
continues
to
cool
the

pas

senger
compartment
even
when
the

car

is
at
a

standstill

The
device
is
a
vacuum
actuator

and
is

equipped
with
a

diaphragm
The

diaphragm
deflects
when
vacuum

pres

sure
is

applied
and
as
a
result
the

operating
wire
attached
to
it
is
moved

The

operating
wire
is
connected
with

the
carburetor
throttle
lever
When

the

vacuum

pressure
acting
on
the
dia

phragm
is
lost
the

diaphragm
is

reo

turned
to
its

original
position

AC
6
1

Adjusting
screw

2
Lock
nut

3

Diaphragm

AC266A

Fig
AG

B
FlUI
Idle

Actuator

INTAKE
ACTUATOR

The
intake
actuator
is

actuated

by

the

intake
vacuum
or
the

atmospheric

air
introduced

by
turning
on
or
off
the

vacuum
switch

thereby
opening
or

closing
the
intake

door
The
intake

port
for

atmospheric
air
is

located
on

the
vacuum

switch

The

check
valve

is

a
one

way
valve

and
it

prevents

negative
pressure
from

passing
through
it

except
when
the

pressure
at
the
actuator
side
is

higher

than
at
the

intake
manifold
side

thus

eliminating
the
variation
in

opening
or

closing
the
intake
door

due
to
the

variation
in
the

engine
manifold
vacu

urn

Air

Conditioning

4

1
Control
wire

2
Control
rod

3
Intake
actuator

4
Vacuum

switch

5

Check
valve

6
Intake

return

spring

7
Intake
door

AC268A

Fig
AC
9
Intake
Actuator

AC
7
ELECTRICAL
CIRCUIT

DESCRIPTION

The

following
wiring

diagram
pro

vides
a

complete
description
of
the

whole

circuit
When

both
the

ignition

switch
and
fan

switch
are
tu
ned
on

the
main

relay
is

actuated
and

electric

power
is

supplied
to
the

blower
motor

and
electric
clutch
of
the

compressor

The
blower
motor

speed
is
controlled

by
the

fan
switch

with
the

aid
of

resistors
The

compressor
clutch
is

actuated

by
the

thermostat
A

fuse
is

part
of
the
air

conditioner
harness

Air

Conditioning

Ale
position

Main

relay

Blower

motor

Fan
switch

Fusible

r
link

o
c

Fuse

This

fuse
is
built

into
air

con
harnes
s
I

L
RW
B
5
d

2nd

I
I
olst

Resistor
1

Battery
Ignition
Fuse

1
switch

Micro
switch

Low

pressure
switch

0

Thermost

T
I

CompreSsor

clutch

roo
h

Magnet
valve

AC269A

VENT
8

L
HEAT
DEF
and
REC
HEAT

position

Main

relay

Blower
motor

Fusible

1
link

0
O
C

Fuse

This
fuse
is
built

into
air
coil
harness
RW
o
Fan
switch

Ignition

switch
r
o

Fuse
5
d

2nd

olsl

I

Resistor

0
1

Micro
switch

j

Battery

Low

pressure
switch

0

J

The
most

T
tr
r

I

Compressor

clutch

Magnet
valve

AC270A

Fig
AC
IO
Electrical
Circuit

Ac
a

REFRIGERANT
R
12

The

refrigerant
used
in
the
air

conditioner
is

generally
called
Re

frigerant
12
R
12
No
other

refrig

erant
than
the
above

refrigerant
should

be
used

Note
Exercise

care
when

handling
re

frigerant
as
it
is

stored
under

high

pressure

COMPRESSOR
OIL

The

SUNISO
5GS

refrig
ration

lubricant
should
be
used
to
assure
the

successful

compressor
operation
Use

of
oils
other
than

recommended
or

mixing
of

the
oil
with

other
oils
would

cause
chemical
reaction

or
lead
to

lowered

viscosity
or

deficient
lubrica

tion

The
oil

absorbs
moisture

as
it
con

tacts
the
air

This

points
out
the
need

for

care
not
to

expose
it

to
atmos

phere
for

an
extended

period
of
time

MAINTENANCE

The

following
checks
and
main

tenance
are

especially
important
to
the

air
conditioner

I

Check

refrigerant
level

2
Check

refrigerant
leaks

3
Check

compressor
drive

belt
for

proper
deflection

4

Even
in

the
off
season
turn
the

compressor
for
10
minutes

at
least

once
a
month

by

running
the

engine
at

1

500

rpm

GENERAL

SERVICE

INSTRUCTIONS

If
dirt
water
or
air
enters

the
air

conditioner

system
it

will
be

seriously

affected
Be

sure
to
observe

the

following

I

Always
keep
the

working
place

clean

and

dry
and
free
from
dirt
and
Air

Conditioning

GENERAL
SERVICE

dust

Wipe
water
off
from
the
line

fittings
with
a

clean
cloth
before
dis

connecting

2

Have
all

necessary
tools

in

prepar

ation
beforehand

and
have
tools
clean

and

dry

3

Handling

plug
when

the

system

line
is

disconnected

4

Handling

compressor
oil

For
details
refer
to
each

descrip

tion
in
this

manual

SAFETY

PRECAUTIONS

WARNING

1
Since
direct
contact
of
the

liquid

refrigerant
with

your
skin

will

cause
frostbite

always
be
carelul

when

handling
the

refrigerant

Always
wear

goggles
to

protect

your

eyes
when

working
around

the

system

2
The

refrigerant
service
container

has
a
safe

strength
However
if

handled

incorrectly
it
will
ex

plode
Therelore

always
follow

the
instructions
On
the

label
In

particular
never
store
it
in
a
hot

location
above
520e

1260F

or

drop
it
from
a

high
height

3
The

refrigerant
gas
is
odorless

and
colorless
and

breathing

may

become
difficult
due
to
the
lack

of

oxygen
Since
the

relrigerant

gas
is
heavier
than
air
and

will

lay
close

to
the
floor

be

espe

cially
careful
when

handling
it
in

small
confined

spaces

4
The

refrigerant
itself

is
nonflam

mable
However

a
toxic

gas

phosgene
gas
is

produced
when

it

contacu
fire
and

special
care
is

therefore

required
when
check

ing
for

leaks
in
the

system
with
a

halide
torch

5
Do
not
steam
clean
On
the

sys

tem

especially
condenser
since

excessively
high
pressure
will

build

up
in
the

system
resulting

in

explosion
of
the

system

The

above

precautions
are
essen

tial

in

handling
of

Refrigerant

12
and
their
strict
observation

AC
9
requires
sufficient

training

Therefore
it
is
of
first

impor

tance
that

any
other

personnel

than
a
well
trained
serviceman

should
not
be

allowed
to
handle

the

refrigerant

EVACUATING
AND

CHARGING

SYSTEM

During

servicing
use
caution
to

keep
air

from

getting
into

refrigerant

When
air

enters
the

system
all

refriger

ant
must
be
evacuated

from

system

prior
to

charging
new

refrigerant
Air

in

refrigerant
has
the

following
delete

rious
effects

1
Since
the
condensation

tempera

ture
of

the
air
is

extremely
low
the
air

will
not

be
condensed
when

refrigerant

gas
is
condensed
in
the
condenser

and

the
air

will
thus
remain
in

gaseous

fonn

Consequently
the
effective

thermal
transmission
area
of
condenser

for

refrigerant
gas
will

be
reduced
and

refrigerant
gas
to
be

condensed
will

be

reduced
The

pressure
rise
will
become

proportional
to
the
volume

of
the
air

in

system

2
When
air
and

refrigerant
are

r
tixed
in

system
a

chemical
reaction

will
be

produced
and

hydrochloric

acid
which
will

adversely
affect
the

aluminum

copper
iron
and
other

materials
in

system
may
be

generated

HANDLING
MANIFOLD

GAUGE

The

pressure
at
the

high
and
low

sides
of

system
should
be
measured

when

evacuating
and

charging

refrig

erant
and
when

diagnosing
trouble
in

the

system
The
manifold

gauge
is
used

for
these

purposes
A

manifold

gauge

has
two

pressure

gauges
a
low

pressure

gauge
and
a

high
pressure

gauge
These

gauges
are

connected
to
the

high
and

low
side
service

valves
of

system

through
flexible

charging
hoses
The

construction

of
manifold

gauge
is

shoWn
in

Fig
AC
I
I

When

valve
stem
is

fully
screwed

the
valve
is

front
seated
and
valve

path

Low

pressure

gauge

Compound
pressure
gauge
Air

Conditioning

and
the
tenter

path
are
blocked
When

valve

stem
is
backed
off
the

paths
are

opened

High
pressure
gauge

Back
seated

Full
counter

clockwise

I

VA

l

C
f

f
f
J

l
r

To
low
side
To
vacuum

pump
01

To

high
side

service
valve

refrigerant
can
service
valve

Fig
AC
II
Manifold

Gauge

ConnectIon
to

service
valve

I

Fully
close
both
valves
of

mani

fold

gauge
Connect

high
and

low

pressure
charging
hoses
to
manifold

gauge

2
Remove

caps
from
service
valves

Connect
high
and

low

pressure
charg

ing
hoses
to
service
valves
in

system

The

refrigerant
gas
will
be

discharged

since
check
valve
is

open
when

pressing
charging
hose

onto
service

valve

3

Next
loosen
the
connection
fit

ting
of

charging
hose
at
manifold

gauge
side
for
2
to
3
seconds
to

purge

any
air
inside

charging
hose

by
the

pressurized
gas
in

system

DIsconnection
from

servIce
val
ve

I

Fully
close
both
valves
of
mani

fold

gauge

2
Disconnect

two

charging
hoses

from
service
valves
At

this
time

the

gas
will

be

discharged
until
check
valve

is

closed
Therefore
disconnect
hose

quickly

WARNING

Work
with

fingers

protecte
with

cloth

against
frostbite

by
reo

frigerant
FronHeated

Fun

clockwise

r

AC243

HANDLING
SERVICE
VALVE

An
automatic

check
valve
is

built

into
service

valve
When
this
valve

presses
against
the
connection

fiUing

that
is

when

charging
hose

is
con

nected
to
service

valve
the
valve
is

open
When

charging
hose
is

discon

nected
the
valve
is
closed
auto

matically
Always
observe
the
follow

ing

usage
precautions

1ts

Close

I

Cap

2
Service
valve

3

Charging
hose
ir

Open

4

Packing

5
Check
valve

AC244

Fig
AC
12
Service
Valve

I

Always
install
valve

cap
after

using
service
valve

When

high

speed
operation
is

per

AC
I0
formed
without
valve

cap
a

negative

pressure
will

gradually
build

up
at

the

low

pressure
side
of

system
and
air

may
be
sucked
in
In
addition
dirt

and

dust
will

easily
enter
the
valv
result

ing
in

foreign
matter

entering
the

system

CAUTION

00
not
over

tighten
valve

cap

2
Check
valve
wiJI
be
half

opened

during
connection
and

disconnection

of

charging
hoses
and

refrigerant
will

be

forcefully
discharged
Therefore

connect
and
disconnect

charging
hoses

quickly
while

pressing
flare
nut
of

charging
hose

against
service

valve

WARNING

Work
with

fingers
protected
with

cloth

against
frostbite

by
reo

frigerant

3

Since
close
contact
between
the

thread
of
valve

cap
and
the
thread
of

service

valve
will

prevent
gas
leakage

keep
these
areas
clean
and

free
of

scratches
and

damage

4

Since

packing
of

charging
hose

will
be
lost

during
long
use

always

check

packing
prior
to

installing
charg

ing
hose

HANDLING
CAN
TAP

A

wide

variety
of
can

taps
are

available
The

following
procedures

apply
to

conventional
can

taps

For

the
correct

usage
refet
to

the

manufacturer

s
instructions

I

Connect

charging
hose
to
the

center

fitting
of
manifold

gauge
At

this
time
confirm
that

both
stems
are

fully
turned
in

frontoSeated

2
Turn

can

tap
handle

fully
coun

terlockwise
so
that
the
needle
is

pulled
up

3

Attach
can

tap
to

refrigerant
can

firmly

4

Turn
can

tap
handle

fully
clock

wise

to
make
a

hole
in

refrigerant

can
See

Fig
AC
13

5
Turn

the
handle

fully
counter

clockwise
to
raise
the
needle

Refriger

ant

gas
will
flow

up
to
the
center

fitting
of
manifold

gauge
See

Fig
AC

14

Air

Conditioning

6
Loosen
the
connection

at
the

center

fitting
of

manifold

gauge
for
a

Clockwise
few
seconds
to

purge
air
inside

charg

ing
hose
See

Fig
AC
14

Counterclockwise

j

3

@

I

Can
tap
handle

2

ChlcginS
hose

3
Needle

4

Refrigerant
can

AC246

Fig
AC
13
Can

Top

Purging
air

R

12

To

L9w
pressure

service
valve
AC247

Fig
AC
14

Purging
Air

Ta

High
pressure

service
valve

f

r

AC181A

Fig
AC
15

Discharging
System

AC
ll
DISCHARGING
SYSTEM

The

pressurized
refrigerant

gas
in

side

system
must
be

discharged
to
a

pressure
approaching
atmospheric

pressure
prior
to

evacuating
refrigerant

inside

system
This

operation
should

be
also
made
to

pennit
safe
removal

when

replacing

system
components

A
Close

high
and
low

pressure

valves

of
manifold

gauge
fully

2

Connect
two

charging
hoses
of

manifold

gauge
to

their

respective

service
valves

WARNING

Securely
connect

high
pressure
dis

charge
service
valve
to
that
of

manifold

gauge
with
a
hose
also

connect
low

pressure
suction
serv

ice
valve
to
that
of
manifold

gauge

For

locations
of

high
and
low

pres

sure

discharge
and
suction
service

valves
see

Fig
AC
29

3

Open
both
manifold

gauge
valves

slightly
and

slowly
discharge
refriger

ant
from

system
See

Fig
AC
15

WARNING

Protect

fingers
with
cloth

against

frostbite

by
refrigerant
when
con

necting
the

charging
hose

to
the

service

valve
or

disconnecting
it

therefrom

Nole
Do

not
allow

refrigerant
to
rush

out
Otherwise

compressor
oil
will

be

discharged
along
with

refriger

ant

EVACUATING

SYSTEM

I

Connect

high
and
low

pressure

charging
hoses
of
manifold

gauge
to

their

respective
service
valves

of

sys

tem
and

discharge
refrigerant
from

system
Refer
to

Discharging
System

WARNING

Securely
connect

high
pressure
dis

charge
service
valve
to
that
of

manifold

gauge
with
a
hose
also

connect
low

pressure
suction

servo

ice

valve
to
that
of
manifold

gauge

For

locations
of

high
and

low

pres

sure

discharge
and
wction
service

valves

see

Fig
AC
29