1977 DATSUN PICK-UP coolant

Using
the

tester
check
the

two

black

yellow
BY
wires
from
the
in

hibitor
switch
in
the

ranges
N

and

I
and
the

tw
re
d

black

RBj
wir
s

in

the

range
R
for

continuity
Turn

range
select
lever
in
both

directions

from

each
lever
set

position
and
check

each

continuity

range
It

is
normal
if

the

electricity
is

on
while
the
lever
is

within
an

angle
of
about
30

on
both

sides
from
each
lever
set
line
How

ever
if
its

continl
ity

range
is
obvious

ly
unequal
on

both
sides

adjustment
is

required

If

any
malfunction
is

found
un

screw
the

fastening
nut
of
the

range

selector
lever

and
two

fastening
bolts

of
the
switch

body
and
then
remove

the
machine
screw
under
the
switch

body
Adjust
the
manual
shaft
correct

ly
to
the

position
N

by
means
of
the

selector
lever

When
the

slot
of
the

shaft

becomes
vertical
the
detent

works
to

position
the
shaft

correctly

with
a

clicking
sound

MSlVe
the

switch

slightly
asj
Je
so

that
the
screw
hole
will
be

aligned

with
the

pin
hole
of
the
internal
rotor

combined
with
the
manual
shaft
and

check
their

alignment
by
inserting
a

1
5
mm
0
059
in
diameter

pin
into

the
holes
If

the

alignment
is
correct

fasten

the
switch

body
with
the
bolts

pull
out
the

pin
tighten

up
the
screw

in

the
hole
and
fasten
the
selector

lever
as
before
Check
the

continuity

again
with
the
tester
If

the
malfunc

tion
still

remains

replace
the
inhibitor

switch
Chcck
whether
the

reverse

lamp

and
the
starter
motor

operate
normal

ly
in
these

ranges
If
Ihere
is

any

lrouble

first
check
the

linkage
If

no

fault
is
found
in

the

linkage
check
the

inhibitor
switch

Separate
the
manual
lever
from
Ihe

remote
control
selector

rod
and
turn

the

range
selcct

lever
to

N

Note

In
the

position
N

the
slot
of

the

manual
shaft

is
vertical

STALL
TEST

The

purpose
of
this
test
is
to
check

the
transmission

and

engine
for
trou

ble

by
measuring
the
maximum
num

bers
of
revolutions
of

the

engine
while
Automatic

Transmission

vehicle
is
held
in
a

stalled

condition

The
carburctor
is
in

full
throttle

opera

tion
with

the
selector
lever
in

ranges

f
2

and
I

respectively
Com

pare
the

measured
results
with
the

slandard

values

Components
to

be
tested

and

test

items

I
Clutches
brake

and
band
in
trans

mission
for

slipping

2

Torque
converter

for

proper
fune

tioning

3

Engine
for
overall

properly

STALL
TEST

PROCEDURES

Before

Icsting
c
heck
the

engine
oil

and

torque
converter

oil
warm

up
the

engine
cooling
water
to
suitable
tem

perature
by
running
at

1
200

rpm
with

the
selector
lever
in

the

range
P
for

several
minutes
Warm

up
the

torque

converter
oil
to
suitable

temperature

6010
1000C
140
to

2l20F

I

Mount
the

engine
tachometer
at
a

location
that
allows

good
visibility

fro

the
dri
er
s
seat
and

put
a
mark

on

specified
revolutions
on
the
meter

2

Secure
the
front
and
rear
wheels

with
chocks
and

apply
the
hand
brake

Be
sure
to

depress
the
brake

pedal

fumly
with
the
left
foot
before
de

pressing
the
accelerator

pedal

3
Throw
the
selector
lever
into

the

range
1

4

Slowly
depress
the
accelerator

pedal
until
the

throttle
valvc
is

fully

opened

Quickly
read
and
record
the

engine
revolution
when

the

engine

begins
to
rotate

steadily
and
then

release
the
accelerator

pedal

5

Shift
the
selector
lever
to
N

and

operate
the

engine
at

approxi

mately
1
200

rpm
for
more
than
one

minute

to
cool
down
the

torque
con

ver
ter
oil

and
coolant

6

Make
similar
stall
tests
in

ranges

2
I
and
RIO

Note
The
stall
test

operation
as

speci

f
d
in
item
4

should
be

I
l3de

wiihin
five
seconds
If
it

takes
too

long
the
oil
deteriorates
an

the

clutches
brake

and
band
are
ad

versely
affected
Sufficient
cooling

time
should
be

given
between
each

AT
5O
test
for
the
four

ranges
0
2

I
and
R

JUDGEMENT

High
stall
revolution
more

than

standard
revolution

If
the

engine
revolution
in
stall

condition
is

higher
than
the
standard

values
it

indicates
that
one

or
more

clutches
in

the
transmission
are

slipping
and
therefore
no
further
test

is

required

For
the

following
abnormalities

the

respective
causes
are

presumed

High

rpm
in

all

ranges
low
Iine

pressure

High
rpm
in
D
2
and
I

and

normal

rpm
in
R
Rear
clutch

slipping

High
rpm
in
0

and

normal

rpm
in
I

clutch

slipping

High
rpm
in
R

only
Front

clutch
or
low
and
reverse

brake

slipping

To

determine
which
is

slipping

front
clutch
or
low

and
reverse
brake

a
road
test
is
nceded

If
whilc

coasting
after

starting

with
the
lever
in
1

range
engine

braking
does

not
work

properly
the

low
and

reverse
brake
is

slipping

Otherwise
the
front
clutch
is

slipping

Slipping
of
the
band
brake
is

diffi

cult
to
ascertain

However
if
it

occurs

with
the
lever
in
2

range

engine

revolution
increases

Jp
to
thesarne

level
as
in

I

strange
It

is

impossible

to
check

it
in
the
stall
test
2
and

One

way

2
Standard
stall
revolution

If
the

engine
revolution
in

stall

condition
is
within

the
standard

values
the
control
elements
are

nor

mally

operating
in
the

ranges
0

2
I

and
R

Also

tIle

engine
and
one

way

clutch
of
the

torque
converter
are

normal
in

performance
and

operation

The
one

way
clutch
of

the

torque

converter
however
sometimes

sticks

This
is
determined
in

the
road
test

3
Lower
stall
revolution
than
stand

ard
revolution

If
the

engine
revolution
in
stall

condition
is

lower
than
the
standard

Operation
of
the
heater
is

control

led

by
two
control
levers
located
on

the
instrument

panel
and
a
hand

op

erated
knob
on
the
center
of
the

heater
unit

The
AIR
LEVER
controls
the
air

intake
valve
and

or
room
valve

by
its

lever

positions
OFF
DEFROST
and

ROOM
through
the
control
cables

The
air
intake
valve
draws
the
fresh

outside
air

from
the
cowl

top
grille

and

supplies
the
air
into
the
heater

unit

The
room
valve
is

located
at
the

bottom
of
the

heater
unit
The
air

coming
through
the
air
intake
valve

opening
is

forced
through
the
heater

core
to
the
room

valve
where
the
air
is

distributed
to
the

floor
outlet
and
or

defroster
outlets

depending
on
the

position
of
the
room
valve

The

VENT
KNOB
is

directly
linked

to
the
vent
valve
which

provides
fresh

air

for
the

passenger
Push
the
knob
all

the

way
in

to

open
the
valve
The
fresh

ventilating
air

comes
out
of
the
heater

center
outlet

The
TEMP
lever
is
a

dual

pur

pose
control
one
is

for

regulating
the

flow
of

engine
coolant

flowing
into
Body
Electrical

System

the
heater
unit
and
the
other
for
the

operation
of
the
fan
motor
When
the

lever
is
in

the
OFF

position
the
water

cock
is

closed
and
the
circulation
of

engine
coolant

through
the
heater
core

stops
When
the
lever
is
slided
to

any

other

position
than
OFF
the
water
cock

opens
in

proportion
to
the

lever

setting
and
allow

engine
coolant

to

flow
into
heater
core

To
control
the
fan
motor

opera

tion

push
or

pull
the
lever
knob
Two

speeds
are

provided
for
the

fan
motor

by
using
a
three

position
switch

FUSE

IOfF
UlwlHI

ON
1

t

f
SWITCH

u

FUSI
BlE

rl
HEATE

R

LINK
SWITCH

is

G
luJ

BATTERY
HEATER
MOTOR

H
EATER
UN
IT

BE868A

Fig
BE
46
Circuit

diagram
of
heater

8E
27

HEATER
UNIT
ASSEMBLY

Removal

L
Disconnect

battery
ground
cable

2

Drain

engine
coolant

3

Remove
defroster
hoses

4

Remove
three

cable

retaining

clips
and
disconnect
control
cables

from
valves
and
water

cock

5

Disconnect
two

fan
motor
lead

wires
from
each
connector

6
Disconnect
two
resistor

lead
wires

from
each
connector

7

Disconnect
water
hoses
from
core

and
water
cock

8

Remove
three

heater
housing

mounting
bolts
and

dismount
heater

unit
from
vehicle

Installation

1

Position
heater
unit
under
instru

ment

panel
and
install
three
heater

unit

securing
bolts

2

Install
water
hoses

3
Position
heater

control
cables
to

room
valve
air
intake
valve
and
water

cock

4

Adjust
control
cable

length
for

proper
operation
as

outlined
in

Adjust

ment

5
Connect
fan
motor
wires
and

resistance
wires

to
each
connector

plug

6

Install
defroster
hoses

7

Connect

battery
ground
cable

8
Fill

cooling

systeIT

9
Run

engine
at
2
000

rpm
with

AIR

lever
in

the
HOT

position

Make
sure
that

engine
coolant
is
fIlled

up
to
correct
level

HEATER
CORE

Removal
and
installation

L

Drain

engine
coolant

2
Remove
defroster
hoses

3
Disconnect
water
hoses
from
inlet

and
outlet

pipes
of
heater
core

4

Remove
four

clips
and
front

cover
Body
Electrical

System

BE869A

Fig
BE
48

Removing
front
cov
r

S

Withdraw
heater
core
from
heater

housing

BE870A

Fig
BE
49

Removing
heater
core

6

Install
heater
core
in

the
reverse

sequence
of

removal

FAN
MOTOR

Removal
and
Installation

L
Dismount
heater
unit

assembly

from
vehicle

as
outlined
in
Removal
of

Heater
Unit
Assembly

2
Remove
nine

spring
clips
and

disassemble
heater

housing

3
Remove
fan
from
fan
motor

4
Remove
fan

motor

retaining

screws
and
fan
motor

S
Assemble
heater

housing
and
in

stall
heater
unit

to
vehicle
in
the

reverse

sequence
of
removal

as
out

lined
in

Installation
of

Heater
Unit

Assembly

I

CONTROL
ASSEMBLY

Removal
and
Installation

I
Remove
three
cable

retaining

clips
and
disconnect
control
cables

from
valves
and
cock

BE
29
2

Disconnect
three
lead
wires

from

each
connector

plug

3

Remove
radio
bezel
from
the

front
of
radio

following
instructions

in

steps
I

to
3
in

Removal
of
Radio

4

Remove
heater
control
knobs
and

heater

bezel

5

Remove
two

retaining
bolts
and

heater
control

assembly

6
Install
control

assembly
in
the

reverse

sequence
of

removal
When

connecting
control
cables

to
valves
and

cock

adjust
control
cable

length
as

outlined
in

Adjustment

ADJUSTMENT

AIR
lever

L
Move
AIR
lever
to
the
DEF

position

2

Open
air
intake

valve
and

connect

control

cable
to
air
intake
valve

3

Clip
control
cable
with
cable

re

taining
clip

Fig
BE
50
A
iT
intake
valve

4
Pull
room
valve

upward
and
con

nect
control
cable
to
room
valve

5

Clip
control
cable
with

cable
re

taining
clip

BE871A

Fig
BE
51

Room
valve

INSPECTION

Evaporator

Check

evaporator
for

leakage
or

damage
If

damaged
replace

Expansion
valve

Check

expansion
valve
for

leakage

or

clogging
If

clogged
clean
filter
in

expansion
valve
If

damaged

replace

RECEIVER
DRYER

AND

PIPING

REMOVAL
AND

INSTAUATION

Receiver
dryer

I
Disconnect

battery
ground
cable

2

Discharge
system
Refer
to

Dis

charging
System
under
General
Service

section

3

Disconnect

compressor
lead
wire

at

connector

4

Disconnect

cooling
pipes
at

joints

Acno

Fig
AC
39

Diaconnecting
coo

ing

pipes

Notes

a

Plug
all

piping

joints
immediately

after

pipe
disconnection
to

prevent

entry
of
dust
or
moisture
laden
air

into

receiver

dryer
or
air
aJOdi

tioning
system

b
Use

two
wrenches
when
dIsconnect

ing
cooling
pipes

5

Remove
four
screws

securing

receiver

dryer
bracket

to
vehicle

body

and
detach

compressor
relay
and

pres

sure
switch
as
an

assembly

6
To

install
receiver

dryer
and

piping
reverse
the
order
of
removal
Air

Conditioning

Notes

a

Apply
a
coat
of
fresh

compressor

oil
to

sealing
surfaces
when
con

necting
cooling

pipes

b
Use
two
wrenches
when

connecting

cooling
pipes

c

Evacuate

cooling
system
then
re

charge
with

refrigerant

Refer
to

Evacuating
and

Checking

System
under
General
Service

sec

tion

d
Check

refrigerant

leakage
if
neces

sary
repair

Refer
to

Evacuating
and

Charging

System
under

General
Service
See

tion

Condenser

Disconnect

battery

ground
cable

2

Discharge

system
Refer

to
Dis

charging
System
under
General

Service

section

3
Drain

engine
coolant

4

Remove
radiator

grille

5

Remove

radiator

shroud
and

radiator

On
automatic
transmission

models

disconnect
both

torque
converter
oil

hoses

Note

While

cooling
water
is
hot

take

precautions

against
scalding

6
Disconnect
two

pipes
from

con

denser
remove
two

screws

securing

condenser

Condenser

can
now
be

removed

AC485

Fig
AC

40

Removing
conden
er

Notes

a
Use

two
wrenches
when
disconnect

ing
pipe

joints

b

Plug
openings
immediately
after

disconnecting
pipes

7

To
install

reverse
the
order
of

removal

AC

29
Tightening
torque

Flare
nut
for

copper
tube

from

compressor

2
5
to
4
0

kg
m

i8
to
29
ft
Ib

Flare
nut

for

copper
tube

to
receiver

dryer

2
5

to
3
5

kg
m

i8
to
25
ft
lb

Notes

a
When

disconnecting
and

connecting

cooler

pipes
be
sure
to

use
two

wrenches

b

Apply
a
coat
of
fresh

compressor

oil
to

sealing
surfaces
when

con

necting
cooler

pipes

c

To

prevent

possibility
of

explosion

due
to

high

pressure
within

cooling

system
do

not
clean
condenser

with
steam

Always
use
cold
water

or

cold

compressed
air

d
Evacuate

cooling
system
then
re

charge
with

refrigerant

Refer
to

Evacuating
and

Charging

System
under
General

Service
sec

tion

e
Check

refrigerant
leakage
if
neces

sary
repair
Refer
to

Checking
for

Leaks
under
General
Service

sec

tion

INSPECTION

RecelYer

dryer

Check
for

refrigerant
leakage
or

damage

Check
for

proper
connection
of

two

lead
wires

running
to

pressure

switch

If

any
component

part
is
found

damaged
replace
receiver

dryer
and

pressure
switch
as

an

assembly

Condenser

I

Check

inlet
and
outlet

pipe
joints

and

sealing
surfaces
for

damage
Re

place
parts
if

damaged
or

leaky

2

Clogged
condenser
fins
or

air

pas

sages
may
reduce

cooling
efficiency
of

condenser
Clean
these

areas
with

dry

compressed
air

Piping

Check

piping
for

leakage
If

leakage

occurs
at
connections

retighten

connecting
nuts

Replace
if

leakage

persists