air conditioning DATSUN 210 1979 Owner's Guide

r

CYLINDER
HEAD

AND
VALVE

PLATE

Insufficient

refrigerant
v

p
sion

is

likely
to
be
caused

by
damaged
head

gasket
or

damaged
valves

Prior

to

servicing
the

head
and
valve

plate
both
service

valves
should
be

opened
to
free

any
gas
pressure
which

may
be
in
the

compressor

REMOVAL

I

Remove
cylinder
head

securing

bolts

Fig
AC

57
Removing
Cylinder
Head

2
Remove
valve

plate
and
head

from

cylinder
by

prying
or

tapping

under
the
ears
which

extend
from

valve

plate

If

head
and
valve

plate
adhere
hold

head
and

tap
valve

plate
ears

away

from
head

with
a
soft
hammer

CAUTION

00

not
hit
or

llIp
head
to

separate

head
and
valve

plate
because

damage

to
head

may
result

AC871

Fig
AC
58

Removing
Volve
Plate

and
Head

3
When

removing
the

gaskets
use
a

sharp
edged
knife
Air

Conditioning

CAUTION

a
In

removing
head

gasket
be

very

careful
not

to

damage
machined

sealing
surface

b
00
not
reuse

gaskets

AC815

Fig
AC
59

Removing
Gasket

INSTALLATION

Valves
and
valve

plates
are
furnish

ed

only
as
a

complete
assembly

8

AC872

Fig
AC

60
Valve
Plate

Assembly

I

Apply
a
thin
mm
of
clean
refri

geration
oil
on
area
of
crankcase
to
be

covered

by
cylinder
gasket

Fig
AC
61

Applying
Clean

Refrigeration
Oil

AC
30
2

Place

cylinder

gasket
in

position

on

cylinder
so
dowel

pins
in

crankcase

go

through
dowel

pin
holes
in

cylinder

gasket

3

Apply
a
thin
flim
of
clean
refri

geralion
oil
to

top
and
bottom
valve

plate
areas
to
be
covered

by
gaskets

4

Place
valve

plate
in

position
on

cylinder
gasket
so

discharge
valve
as

semblies

I
e

smaller
diameter
assem

blies
with

restrainer
over
valve
reed

are

facing
up
and

locating
dowel

pins

go
through
dowel

pin
holes

in
valve

plate

AC817

Fig
AC
62

Placing
Valve
Plate

5
Place
head

gasket
in

position
on

valve

plate
so
dowel

pins
go
through

dowel

pin
holes
in

gasket

6

Apply
a
thin
mm
of
clean
refri

geration
oil
on
the

machined
surface

of

cylinder
head
which
matches
head

gasket

7

Place
head
on

cylinder
head

gas

ket
so
dowel

pins

go
into

dowel

pin

holes
in
head

8

Tighten
screws
to

specified
limit

iil

Tightening
torque

Cvlinder
head
screws

2
1
to
3
2

kg
m

15
to
23
ft
Ibl

DISCHARGE
AND

SUCTION

CONNECTORS

Discharge
and
suction
connectors

are
located

on
rear
side
of

compressor

REMOVAL

1
Remove
each
screw

securing
dis

charge
and
suction
connectors

using

TOD
Driver
Bit

2
Pull
out
each

discharge
and

suc

tion
connector

Note
Memorize
mounted
direction
of

discharge
and
suction
connectors
to

ensure
correct

reassembling

a@

AC873

Fig
AC
63

Removing
Discharge
and

Suction
Connectors
Air
Conditioning

INSTALLATION

I

Attach
new
O

ring
to
each

cy

lindrical

portion
of

discharge
and
suc

tion
valves

Note

Apply
clean
lubricant
to
O

ring

so

that
it
can
be

fitted

tightly
to

cylindrical
portion
and

crankcase

hole

AC
31
2
Insert
each

discharge
and

suction

valves
into

correct
valve

port
in

crank

case

by
matching
it

with
mark
on

cylinder
head

3

Set
each
valve
in

the
same

posi

tion

as
it
was
before

removal
and

tighten
screws
with

specified
torque

cD

Tightening
torque

Discharge
and
suction

connectors

2
1
to
3

2

kg
m

15

to
23
ft
b

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

v

Air

Conditioning

VACUUM
SYSTEM
DIAGNOSES

FAST
IDLE
CONTROL

DEVICE

F
I
C
O
does
not

operate

Disconnect

vacuum
hose
from
fast
idle
actuator
and
connect

vacuum
tester

light
ON

Light
OFF

Replace
actuator

Disconnect

magnet
valve
hose
at
intake
mani

fold
side

and
connect
vacuum
tester
to
the

open
end

of
the
hose
and

magnet
valve

light
ON

I
light
OFF

Connect
12
volt
test

light
between

magnet

valve
lead
wires
Check
vacuum
connector
and

hose
If
hose

or

connectors
are

damaged

replace
it

light
ON

light
OFF

Replace
magnet
valve
Inspect
circuit
of

magnet
valve

Refer
to

Compressor
Clutch

Diagnoses

Note

Vacuum
lester
Tester

Iighl
keeps
OFF
unless
normal
wcuum
level
exists

in
each
check

point

AC
36

PERFORMANCE
TEST

DIAGNOSES

Of
various
conditions
caused
to
the

air

conditioning
system
the

character

istics
revealed
on
manifold

gauge
read

ing
are
shown

in
the

following

Condition
Air

Conditioning

As

to
the
method

of
a

perfonnance

test
refer
to
the
item

of
Perfonnance

Test

Note
In
the

following
table
the

portion
smeared
with
ink

on
each

I
INSUFFICIENT
REFRIGERANT

CHARGE

I

I

@
@

08A

I
ALMOST
NO

REFRIGERANT

i

@

@

AC209A

I
FAULTY
EXPANSION
VALVE

I

I

@
@

AC210A
Insufficient

cooling

Bubbles

appear
in

sight

glass
Probable
cause

Refrigerant
is
small

or

leaking
a
little

No

cooling
action
Serious

refrigerant
leak

In

sight
glass
appear
a

lot

of
bubbles
or

something

like
mist

Slight
cooling

Sweating
or
frosted

expan

sion

valve
inlet

AC37
Expansion
valve
restricts

refrigerant
flow

Expansion
valve
is

clog

ged

Expansion
valve
is
in

operative

Valve
stuck

closed

Thermal
bulb

has

lost

charge
gauge
scale
indicates
a

range
based

on
the

assumption
that
the
air

conditioning
system
is
in

good

order

Corrective
action

I

Leak
test

2

Repair
leak

3

Charge
system

Note
Evacuate

8S
neces

sary
and

recharge

sys

tem

Stop
rompressor
immedi

ately

I

Leak

test

2

Discharge
system

3

Repair
leak
s

4

Replace
receiver
drier

if

necessary

5

Check
oilleve

6
Evacuate
and

recharge

system

If
valve
inlet
reveals
sweat

or
frost

I

Discharge
system

2
Remove

valve
and

clean

it

Replace
it

if
neces

sary

3

Evacuate

system

4

Charge
system

If
valve
does

not

operate

I

Discharge
system

2

Replace
valve

3
Evacuate
and

charge

system

Condition

I
FAULTY
CONDENSER

I

I

@
@

AC215A

I
HIGH
PRESSURE
liNE
BLOCKED

I

r

@

@

AC216A

I
FAULTY
COMPRESSOR

I

r
j
@

rg

AC217A
Air

Conditioning

o

cooling
action

engine

may
overheat

Bubbles

appear
in

sight

glass
of
drier

Suction
line
is

very
hot

Insufficient

cooling

Frosted

high
pressure

liquid
line

Insufficient

cooling

AC
39
Probable
cause

Condenser
is

often
found

not
functioning
well

Drier

clogged
or
restric

tion
in

high
pressure
line

Internal

problem
in
com

pressor
or

damaged
gasket

and

valve
Corrective
action

Check
fan
belt
and

fluid

coupling

Check
condenser
for

dirt

accumulation

Check

engine

coqling

system
for
overheat

Check
for

refrigerant

overcharge

Note
If

pressure
remains

high
in

spite
of
aU

above
actions
taken
re

move
and

inspect
the

condenser
for

possible

oil

clogging

I

Discharge

system

2
Remove

receiver
drier

or
strainer

and

replace

it

3

Evacuate
and

charge

system

I

Discharge
system

2
Remove
and
check

compressor

3

Repair
or

replace
com

pressor

4

Check
oil
level

5

Replace
receiver
drier

6
Evacuate
and

charge

system

r

Air

Conditioning

Condition

TOO
MUCH
OIL
IN

I
SYSTEM

Excessive
lostlfficient
cooling

r

i

@

g
@

Ti

AC218A
Probable
cause

Too
much
oil
circulates

with
refrigerant
causing

the
cooling
capacity
of
the

aystem
to
be
reduced

AC40
Corrective
action

Refer
to
Oil
Level
Check

for

correcting
oil

level

PERFORMANCE
CHART

TEST
CONDITIONS

Test
car
location

Door
windows

Door

Hood

Air
lever

Temperature
lever

Fan
switch

Engine
speed
Indoor
or
in
the
shade

Open

Closed

Open

COOL
Ale

Max
cold

3rd

1
500

rpm

TEST
READING
Air

Conditioning

Inside
air

Recirculating
air

at

cooling
unit
inlet

Relative
humidity

40
to

60

60
to

80

Relative

humidity
Ambient
air

temperature

oe
OF

40
to

80
20
68

25
77

30
86

35
95

40

104
Discharged
air

temperature
at

center
outlet

oe
OF

Air

temperature

oC
OF

20
68

25
77

30
86

35
95

20
68

25
77

30
86

35
95
1
5
to
5
0
35
to
41

6
0
to
9
5
42
to

49

10
5

to
14
0
51
to
57

i5
O
to
19
6

59
to
66

5
0
to
8

0
41
to

46

9
5
to
13
0
49
to
55

14
0
to
18
0
57
to
64

19
0
to
23
0

66
to
73

Pressure

high
Discharge
side

kg
cm2

psi
Pressure
low
Suction
side

kg
cm
2

psi

9
8
to
10

7

139
to
152

10
5
to
11
8
149

to
168

12
0
to
13

9
171
to
198

13
9
to

16
7

198
to
237

16

5
to

20
5
235
to
292
1
1

to
1

8

16
to

26

ii

1

2
to
1
9
17
to
27

14
to
2
3
20

to
33

1

9
to
2
8
27
to

40

2
7
to
3
8
38
to

54

AC
41

r

Air

Conditioning

SERVICE
DATA
AND

SPECIFICATIONS

GENERAL

SPECIFICATIONS

Compressor

Model

Type

Displacement

Cylinder

Bore
x

stroke
cc
ell
in

rev
SC206

Yoke

100
6
10

mm
in

47

6
x
28
1

1
874
x
1
106

Clock
wise

View
from
drive
end
Direction
of
rotation

Lubrication

oil

Type

Capacity
in

refrigeration

system
cc
US
11

OZ

Imp
11
oz
SUNISO
5GS

237
8
0
8
3

Refrigerant

Type

Capacity
kg

lb
R
12

0
8
to
1
0
1

8
to
2
2

INSPECTION

AND
ADJUSTMENT

Belt

tension

mm
in

kg

lb

Fan

belt

applied
pressure
8
to
12

0
31
to
0
47

10
22

8
to
12

0
31
to
0
47

10
22
A
C

compressor
belt

applied
pressure

F
I
C
D

adJustment

Automatic
700

rpm

650

rpm

at
Du

position
When

AlC
is

ON

F

LC
D
is

actuated

800

rpm

800

rpm

at
Nu

position
Engine
model
Transmission
When

AlC
OFF

Manual

AI4
AI5

Clutch
hub
to

pulley
clearance
mm
in

0
4
to
0

6
0

016
to
0
024

AC
42