relay DATSUN 210 1979 Owner's Manual

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
LINES
Air

Conditioning

@

I

J

L

S

r
Z
S
t

@

See

Fig
AC
29
When

replacing

flexible
hose
and
tube
observe
the

following

1

Before

starting
work
be

sure
to

discharge
system

2

When

disconnecting
tubes
be

sure
to

use
two

wrenches
on
both

tubes

3

After
discon

ecting
tubes

plug

all

openings
immediately
to

prevent

entrance
of
dirt
and
moisture

4

Compressed
air
must
never
be

used
to
clean

dirty
line
Clean
with

refrigerant

gas

5
In

connecting
tubes
be
sure
to

apply
compressor
oil
to

seating
surface

and
then

tighten
tubes
to

specified

tightening
torque
See

Fig
AC
30

Be

sure
to
use
two
wrenches
when

tightening
a
flare

nut
of
tube

Coat
seat
surfaces
with
com

pressor
oil
and
then

tighten

AC263

Fig
AC

30
Line
Connection
CD

6
Make
sure

refrigerant
line
is

clamped
securely
Start

engine
and

raise

engine
speed
to

inspect
if
there
is

vibration
or
unusual
noise

7

Conduct
leak
t
st
and
make
su
e

that
there
is
no
leak

from
connections

8
Refer
to

General
Service
for

evacuating
and

charging
system

COOLING
UNIT

REMOVAL

I

Disconnect

battery
ground
cable

2

Discharge

refrigerant
from

sys

tern
Refer
to
General
Service

3
Loosen

flare
nuts
at
each
con

nection
of
inlet

and
outlet

pipes
of

evaporator

AC
21
1

High
pressure
discharge
service

valve

2
Low

pressure
suction
service
valve

3

Compressor

4

Condenser

5
Receiver

drier

6

Cooling
unit

7

Low

pressure
switch

lightening
torque

kg
m
ft
lb

@
4

5
to

5
0
33
to
36

@
3
0
to
3
5
22
to
25

AC385A

Fig
AC
29

Refrigerant
Lines

CAUTION

Immediatelv
plug
up
all

openings

to

prevent
entrance
of

dirt
and

moisture

4
Remove
instrument
under

cover

5
Remove

glove
box

6
Disconnect

wiring
harness

con

nectors
from

compressor
relay
and

thermostat

7
Remove

upper
and
lower

attach

ing
bolts
and

remove

cooling
unit

AC386A

Fig
AC
31
Removing
Cooling
Unit

to

DISASSEMBLY

AND
ASSEMBLY

y
1

7
1
r

II

l

1

Using
a
knife
cut

packings
at

upper
and
lower
case
fit
in

portion

2
Remove

clips
fixing
upper
case
to

lower

case

3

Separate
upper
case
from
lower

case

by

pulling
it

upward

4
Withdraw

evaporator
assembly

out
oflower
case

5
Remove
thermostat
from

upper

case

by
removing

attaching
screWs

CAUTION

Capillary
tube
should
not
be
bent

too

sharply

6
To
assemble
reverse
the

order
of

disassembly
Be

sure
to

join
mating

surfaces
of

packings
at

upper
and

lower
case
fit
in

portion
with
an
adhe

sive

substance

Note

When

installing
thermostat

in

sert

capillary
tube
in
same

place
as

it

was
before
removal
Be
sure
to

insert

capillary
tube
end
about

50

em
19
7

in
from

evaporator
core

INSPECT

ON

In

case

evaporator
core
or

expan

sion

valve
have

gas

leaking
repair
or

replace
it
with

a
new
one
as

necessary

Dirt
and

nicotine
accumulation

on

evaporator
case
will

go
b
d
and
smell
Air

Conditioning

1

Mainrelay

2

Thermostat

3

Upper
case

4

Expansion
valve

5

Evaporator
assembly

6

Lower
case

ID

AC387A

Fig
AC
32

Cooling
Unit

This
means
that

you
have
to

remove

them
from
time

to
time
to
assure

healthful
fresh
air
inside

car

INSTAllATION

Install

evaporator
in
the
reverse

order

of
removal

observing
the
follow

ing

I
When

replacing

evaporator
with

new

one

charge
compressor
with

same
amount
of
new
oil
as
was
drained

before

2

Evaporator
case
should

be
in

stalled
as

close
s

possible
to

heater

unit

3
Refer
to

Fig
AC
29
for

tighten

ing

torque
of
flare
nuts

4
Refer
to
General
Service

for

evacuating
and

charging
system

5
Conduct
leak
test
and
ensu
e

that

there
is

no

gas
leak
from
conne
tion

EXPANSION
VALVE

Expansion
valve
malfunctions
such

as
valve

stuck

open
valve
stuck

close

refrigerant
leakage
and

improper
in

stall
tion

of

sensing
bulb
are
de

scribed

The
first
two
conditions

require

replacement
of

expansion
valve

When
both
water

and

refrigerant

AC

22
are
circulated

in
the

system
frost
cwill

form

near
the
ball
of

expansion
alve

and

block
the
flow
of

refrigerant
In

this
case

however

operation
of
the

valve

can
be
returned
to

normal

by

heating
the
valve

Expansion
valve
is

equipped
with

an

adjusting
screw
However
since

the

screw
is
set

properly
at

the

factory

adjustment
is

unnecessary
If

expan

sion

valve
is

damaged

replace
with

new
one

RIEMOV
L
AND

INSTALlATION

See

Fig
AC
32

Disconnect

baltery
ground
cable

2
Remove
ev

porator
Refer
to

Cooling
Unit
for

removal

3

Remove
heat
insulator

covering

expansion
valve

assembly

4
Remove

clamp
attaching
sensing

bulb

5

Loosen
flare
nuts
and
remove

expansion
valve
from

evaporator
and

inlet

pipe

CAUTION

Plug
all

openings
to

prevent
entrance

of
dirt
and
moisture

6

Installation
is
ill
the
reverse
order

of

removal

THERMOSTAT

REMOVAL
AND

INSTALlATION

See

Fig
AC
32

Remove

cooling
unit

2
Remove

screws

attaching
thenno

stat
and
then

remove
thermostat

CAUTION

Capillary
tube
should
not
be
bent

too

sharply

3
Installation
is
in

the
reverse
order

of
removal

Note
When

installing
thermostat
in

sert

capillary
tube

in
same

place
as

it
was

before
removal

Be
sure
to

insert

capillary
tube
end
about
SO

em

19
7
in
from

evaporator
core

INSPECTION

1
Test

continuity
between
two

switch
terminals

with
test

lamp
or

ohmmerter

Continuity
should
exist

2
With

capillary
tube
end

dipped

into
ice

salt
water
maintained
to
I

oc

300
F
test

continuity
between
two

switch

terminals

Continuity
should

not
exist

3
If

switch
is

found

damaged
re

place

MAIN
RELAY

REMOVAL

AND

INSTALLATION

I
Disconnect

battery
ground
cable

2
Remove

glove
box

3
Disconnect

connector
from
main

relay

4

Remove
screw

retaining
main

relay
to

cooling
unit
then
remove

main

relay

5

Installation
is
in
the
reverse

order

of

removal

INSPECTION

Test

continuity
of

relay
with
ohm

meter
or
test

lamp
In

testing
main

relay
there
must
be

continuity
be

tween

CD
and

CV

When
l2Y

direct

current
is

applied

to

CD

CV
CID

@
normally
close

ti

I

I
6

i

i
f

i

f

Fig
AC
33
Air

Conditioning

HEATER
UNIT

Refer
to
Heater
Unit

Section
BE

WATER
COCK

Refer

to
Water
Cock
Section
BE

BLOWER
MOTOR

Refer
to
Blower

Motor
Section

BE

RESISTOR

Refer

to
Resistor

Section
BE

MICROSWITCH

CV

REMOVAL
AND

INSTALLATION

1
Remove
air

conditioner
control

assembly
Refer

to
Heater
Control

Assembly
Section
BE

2

Remove
screws

attaching
micro

switch
and

then
remove
rnicroswitch

3

Install
rnicroswitch
in
the
reverse

order

of
removal

I

NSPECTI
ON

Make

sure
that

continuity
exists
in

AC
23
AIR

CONDITIONER

CONTROL

Refer
to
Heater
Control

Assembly

for
Air

Conditioner
Section
BE

Note
When

adjusting
AIC
control

cable

and
rod

keep
in
mind
that

OFF

on
front

panel
is
used
as

A

C
for
air

conditioning
sys

tem

FAN

SWITCH

Refer
to

Fan
Switch
Section
BE

1
Microswitch

2
Fan
switch

AC19SA

Fig
AC

34
Microswitch

rnicroswitch
when

its

protruding
part

is

pushed

w

AC199A

Fig
AC

35
Microswitch

WIRING
DIAGRAM

CIRCUIT
DIAGRAM

Air

conditioner
system

G
DD

w

FUSIBLE

LINK

I
BATTERY

LG
Lr

LG
c
J

LW
J

I
THERMOSTAT

W

W

r
B

B
8

ALTERNATOR

IGNITION

SWITCH

il

W

LB

LLG

J

LOW
PRESSURE

SWITCH

L
c
J

L
c
J

l

J
MAGNET

VALVE

L

c
J
CJ
C

COMPRE
SOR

CLUTCH

LIT

IACC

15A

L1

3
E
FUSE
BLOCK
Air

Conditioning

W

1
8
t
FUSE

20A

MAIN

RELAY

J
rn

W
I

fJ
RESISTOR

Dt
J

M
BLOWER

MOTOR

W

c
J
c
J
C

r

BvM

LW

LY
I

MICRO

SWITCH

B

AC404A

Fig
AC
39
Circuit

Diagram

of
Air
Conditioner

I

AC

25

Air

Conditioning

BLOWER
MOTOR
DIAGNOSES

I
Blower
motor
inoperative

I
Check
20

ampere
fuse
in
air
conditioner
harness

Fuse
blown
Fuse

OK

Locate
short
circuited

spot
and

repair

or

replace
faulty

parts
Ground
one
of
lead
wires

Black
blue
3

speed
Black
white
2

speed

Black

yellow
l

speed
1eading
to
fan

switch

Blower
runs
Blower
does

not
run

Check

ground
circuit
and

lead
wire
con

oeetion
When
no

problem
is
found

replace
blower

switch
Ground
black
wire

of
blower
motor

i

Blower

runs
Blower
does
not

run

Check
resistor
for
connection
When

no

problem
is
found

replace
resistor
Connect
12
volt

test

light
to
white
wire

leading
to

blower
motor

Light
ON
Light
OFF

Check
lead
wire
for
connection

When

no

problem
is
found

replace
blower
motor
Check
for

presence
of

voltage
at
main

relay

No
Yes

Check
for

presence
of

voltage
at
air

conditioner
harness
Check

lead
wire
for
connection

When
no

problem
is
found

replace
relay

AC
33

Air

Conditioning

COMPRESSOR
CLUTCH
DIAGNOSES

Compressor
clutch
is

not

engaged

Check
20

arnpere
fuse
in
air
conditioner

harness

Fuse
blown

Fuse
OK

Locate
short

circuited

spot
and

repair
or

replace
damaged
parts
Connect
12
volt
test

light
to

compressor

clutch
lead
wire
Ground
the
other
end
of

test

light
Set
air
control
lever

to
A
C

posi

tion

Light
ON
Light
OFF

I

Check
low

pressure
switch
for

continuity

L
H
drive

only
Check
lead

wire
and

ground
wire
of

compres

sor
clutch
for
connection
When
there
is

nothing
wrong
with
them

replace

compressor

clutch

No

I
Yes

Measure

pressure
in

system
If
there
is
a

leak
service

system
If

pressure
is
normal

check
low

pressure
switch
as
a

part
reo

place
if

necessary
Connect
12
volt
test

light
to
terminal
of

blue

green
wire

leading
to
thermostat

Ground
the
other

end
of
test

light

Light
ON
Light
OFF

Check

ground
circuit
and
make

sure
of

proper
connection

Further

check
lead
wire
connection

and
when

no

problem
is

found

replace
air
conditioner

harness
or
main

harness
Connect
12

volt
test

light
to
blue
white
wire

of
microswitch
Ground
the
other
end
of

test

light

I

Light
ON

I
Light
OFF

I

Check
lead
wire
connection

When
no

problem
is
found

replace
thermostat
Check
for
current
flow
in

lead
wire
to
main

relay

Yes

I
I
No

Check
lead
wire

for
connection

When
no

problem
is

found

replace

microswitch
or
main

relay
Check

power

supply

AC
35