1979 DATSUN 210 fuse

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

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