1979 DATSUN 210 heater

Condition

Insufficient

heating

performance

No
heated

air

discharged

Insufficient
air

flow

to

floor

Insufficient

defrosting

performance

Cold
air

discharged

Insufficient
air
flow

to
defroster

Heated
air

discharged

with

lever
in
VENT

Blower

motor
does

not

run

Control
lever

drags

Outside
air
comes
in

with
fan
in
OFF

Noise

frol11
blower

motor
Body
Electrical

System

Probable
cause

Cooling
water

temperature
too

low

Heater
core

plugged

Insufficient

cooling
water

level

Malfunctioning
air
mix
door

Malfunctioning
water

cock

Blower
motor

speed
too

low

Malfunctioning
floor
door

Refer
to
No

heated
air

discharged

Malfunctioning
hoor
door

or
faulty
seal

Defroster
nozzle

plugged

Leak

at
defroster
duct
lo
nozzle
connection

Water
cock
not

operating
properly

Mode
door
not

operating
properly
or

seal

damaged

Fuse
melted

MOlor
wire
connector
disconnected

Faulty
switch

Faulty
motor

Faultyblower
control

amplifier

Inner
wire

rubbing

against
outer
case
end

Control
cable
bent

excessively

Malfunctioniilg
doors
door

levers
etc

Air

intake
door
not

operating

properly

Control

cable
out
of

adjustment

Loose
bolt

in
blower

motor

BE

56
Corrective
action

Check
thermostat

Rep1ace
as
nece

ry

Clean

Rem

Adjust
control
cable

Adjust
control
cable

Check
motor
terminal

voltage

Repair

poor
connection
and

discontinuity

Replace
motor
if

necessary

Replace
blower

control

amplifier
if
neces

sary

Adjust
control
cable

Adjust
control
cable

Clean

Correcl

Adjust
control
cable

Adjust
control
cable

Correct

cause
and

replace

qrrect

Replace

Check
and

correct

Replace

Adjust
control
cable

Correct

Ch

ck
and
COrrect

Repair
or

replace

Adjust
control
cable

Check
and

tighten
loose
bolts

DATSUN

210
Model

8310
Series

SECTIONAC

AIR
CONDITIONING

CONTENTS

DESCRIPTION

OUTLINE
OF
AIR
CONDITIONER

REFRIGERATION
SYSTEM

AIR
FLOW

VACUUM
SYSTEM

ELECTRICAL
CIRCUIT

GENERAL
SERVICE

REFRIGERANT
R
12

COMPRESSOR
OIL

MAINTENANCE

GENERAL
SERVICE
INSTRUCTIONS

SAFETY
PRECAUTIONS

EVACUATING
AND

CHARGING
SYSTEM

CHECKI
NG
FOR
LEAKS

REFRIGERANT
LEVEL
CHECK

COMPRESSOR
OIL
LEVEL
OHECK

PERFORMANCE
TEST

REFRIGERANT

LEAKS

SERVICE
PROCEDURES

FAST
IDLE
ACTUATOR

IDL
E
PULLEY
AND
COMPRESSOR

DRIVE
BELT

COMPR
ESSOR

CONDENSER

RECEIV
ER

DRIER

REFRIGERANT
LINES
I

COOLING
UNIT

EXPANSION
VALVE

THERMOSTAT

MAIN
RELAY

HEATER
UNIT

WATER
COCK
AC
2

AC
2

AC
3

AC
5

AC
6

AC
7

AC
9

AC
9

AC
9

AC
9

AC
9

AC
9

AC

1

AC14

AC15

AC
17

AC17

AC17

AC18

AC1B

AC19

AC19

AC
20

AC
20

AC
21

ACc21

AC
22

AC
22

AC
23

AC
23

AC
23
BLOWER
MOTOR

RESISTOR

AIR
CONDITIONER

CONTROL

FAN
SWITCH

MICROSWITCH

LOW
PRESSURE
SWITCH

MAGNET
VALVE

FUSE

REPLACEMENT

VACUUM
HOSE
DIAGRAM

WIRING
DIAGRAM

COMPRESSOR
MODEL
SC206

PRELIMINARY
CLEANING

COMPRESSOR
CLUTCH

SHAFT
SEAL

CYLINDER
HEAD

AND
VALVE
PLATE

DISCHARGE
AND
sU
CTiON

CONNECTORS

TROUBLE
DIAGNOSES
AND

CORRECTIONS

AIR

CONDITIONER
DIAGNOSES

BLOWER
MOTOR
DIAGNOSES

COMPRESSOR
DIAGNOSES

COMPRESSOR
CLUTCH
DIAGNOSES

VACUUM
SYSTEM
DIAGNOSES

PERFORMANCE
TEST

DIAGNOSES

PERFORMANCE
CHART

SERVICE
DATA
AND

SPECIFICATIONS

GENERAL
SPECIFICATIONS

INSPECTION
AND
ADJUSTMENT

TIGHTENING
TORQUE

SPECIAL
SERVICE
TOOLS
AC
23

AC
23

AC
23

AC
23

AC23

AC
24

AC
24

AC24

AC
24

AC
25

AC
26

AC
27

AC
27

AC
28

AC30

AC30

AC32

AC
32

AC
33

AC34

AC35

AC36

AC37

AC
41

AC
42

AC
42

AC
42

AC
43

AC
44

Air

Conditioning

DESCRIPTION

OUTLINE
OF
AIR

CONDITIONER
level
and

ventilation
functions
Its

control

system
consists

of
a
mechani

cal

system

using
cables
and

engine

vacuum
and
electric

system

The

component
units

of
the
air

conditioner
are
installed
in
the

engine

and

passenger
compartments
the
compressor
and
condenser
in

the
for

mer

and
the
unit

comprising
the

evaporator
heater
and
blower
and
i

Is

control
in
the

latter
The

units
in

the

passenger
compartment
aTe
summa

rized
as
foUows
Th

ipr
conditio
er
isa

combine4

unit

of
an

evaporator
heater
and

blower
and

provides
heating
and
cool

lng
functions
In

addition
it

has
hi

I

1
Heater
unit

2
Ventilation

door

3

Air
mix
dom

4

Air
intake
door

5

Cooling
unit

6
E

r
or

7
Blower
motor

8
Floor
door

AC377A

Fig
AC
1
Air

Conditioning
Unit
and
Air
Flow

AC
2

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

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

C

E3J
i

I

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R

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