1979 DATSUN 210 radiator

REFRIGERATION

SYSTEM

If

you
were
to

paint
your
rmger

with
alcohol

your
finger
would
feel

cold
This
is

because
the

liquid
alcohol

takes
heat

away
from

your

rmger

while
it

evaporates
If

a

quickly
evapo

rating
liquid
such

as
alcohol
is

placed

in
a
container
inside
a
box
the
tern
Air

Conditioning

perature
inside
the
box

will

drop
This

is

because
the

alcohol
is

evaporated

absorbing
the
heat

from
the
air

inside

the
box

If
the

gaseous
alcohol
is

collected
and
cooled

with
cold
water

it

will
be

changed
back
into
a

liquid
by

absorption
of
its
heat

by
the
cold

water

The
cooler

operates
on
this

princi

1
r
I

Outside
air

U

Condenser

r
lf
P

9

n

U

Receiver
drier

AC378A

The

operation
of
the
five
devices
of

the

refrigeration

system
are
described

below

EVAPORATOR

The
heat
of
the
inside
air
which
is

force
irculated

by
the
blower
motor

is

absorbed
by

vaporizing
the

liquid

refrigerant
passed
through
the

evapora

tor
This
cools
the
air
l

t
High
pressure

gas

I
High
pressure

liquid

Compressor

Jj

COMPRESSOR

The

compressor
is
installed
to
the

side
of
the

engine
and
is
driven

by

crank

pulley
through
a
belt
The

refrig

erant

gas
leaving
the

evaporator
is

forced
out
to
the
condenser

by
com

pressor
and
the

low

pressure
refriger

ant

gas
is

compressed
to
a

high

pres

sure
and

high

temperature

AC3
pie
The

liquid
used
is

the

refrigerant

R
12
The
heat
inside
the

passenger

compartment
is
absorbed

by
changing

the

refrigerant
from
a

liquid
to
a

gas

and

then

dissipated
to
the
outside

by

changing
the

refrigerant
from
a

gas

back
to
a

liquid

The

refrigeration
system
is
shown

in

Fig
AC
2

Low

pressure

liquid

C
J
Low
pressure

gas

Inside
air

v

n

Blower

1f
motor

Cooled
air

Fig
AC
2

Refrigeration
Cycle

CONDENSER

The
condenser
is

installed
to
the

front
of
the
radiator
The
heated
and

compressed
refrigerant

gas
from
the

compressor
condenses
to
a

liquid
by

being
cooled

by
air

passing
between

the
fins
of
the
condenser

INSTA
L1ATION

InstaU
in
the
reverse

order
of

removal

observing
the

following

I

When

installing
add

required

amount
Of

compressor
oil
Refer
to

Compressor
Oil
Level
Check

2

Apply
a

coat
of
fresh

compressor

oil
to

sealing
surfaces
of

pipe
joints

3
Check

tightening
torque
of
com

pressor
mounting
bolts

compressor

mounting
bracket

mounting
bolts
and

refrigerant
line
See
Figs
AC
27

and

AC
29

4

DO
not
remove
plugs
from

com

pressor
and
flexible
hose
before

connecting
hoses

S
Turn

compressor
several
times

before

installing

6

Adjust
compressor
drive

belt

tension

See

Fig
AC
2S

7
Evacuate

and

recharge
system

Refer
to

General
Service

for

evacuating
system
and

charging
re

frigerant

8
Conduct
leak
test
and
make
sure

that
there
is

no
leak
from
connections

CONDE
NSER

REMOVAL

Disconnect

battery
ground
cable

2

Discharge
system
Refer
to

Gen

eral
Service
for

discharging
system

3
Remove

radiator

grille

4
Remove

center

stay

5
Disconnect

refrigerant
lines
from

condenser

CAUTION

8
Use
wrench
to
fix
union
on
con

denser
and
then
loosen
flare
nut
of

refrigerant
line
with
another

wrench

b

Plug

up
all

openings
in
condenser

and

system
Air

COl1ditioning

6

Remove

mounting
bolts
ihen

remove
condenser

from
car

1a

11

AC384A

Fig
AC
28

Removing
Condenser

INSPECTION

Inspect

joints
of
inlet

and
outlet

pipes
for
cracks
and
scratches

Upon

finding
any

problem
which

may
cause

gas
to
leak

repair
or

replace
con

denser

Condenser
fins
or
air

passages
clog

ged
with
dirt

insects

or
leaves
will

reduce

cooling

effiCiency
of
con

denser
In

such
a
case

clean
fms
or

air

passages
with

compressed
air

CAUTION

Do
not
clean
condenser
with
ste8m

Be

sure
to

use
cold
water
or
com

pressed
air

INSTALLATION

Install
condenser

in
the
reverse

order
of
removal

observing
Ihe
follow

ing

I

When

replacing
condenser
add

same
amount

of
oil
as

was
drained

from

previous
condenser
to
com

pressor

AC

20
2

Keep
piugsin

place
until
im

mediately
before

connecting
work
is

started

3
Refer
to

Refrigerant
Line

for

tightening

torque
on

line
connec

tions

4

Refer
to
General
Service
for

evacuating
and

charging
system

5
Conduct
leak
test
and
make

sure

that
there
is

no
leak
from
connections

RECEIVER

DRIER

REMOVAL
AND

INS

ALLATION

See

Fig
AC
29

Disconnect

battery
ground

2

Discharge
system
Refer

to
Gen

eral
Service
for

discharging
system

3

Disconnect

refrigerant
lines

from

receiver
drier

CAUTION

Plug
all

openings
to

prevent
entrance

of
dirt
and

moisture

4

Remove
receiver

drier

mounting

screws
Remove

receiver
drier

5
Install

receiver
drier
in

the
reverse

order
of
removal
With

plugs
taken
off

immediately
before

connecting
work

is

started
connect
line
and
receiver

drier

Refer
to

Refrigerant
Une

for

tighten

ing

torque

6
Refer

to
General
Service
for

evacuating
and

charging
system

7

Conduct

leak
test
and
make
sure

that

there
is

no
leak
from
connections

INSPECTION

Check

receiver
drier

for
leaks

or

damage
If

necessary
replace