Datsun C210 series Manual page 515

Air
Conditioning
PERFORMANCE TEST
DIAGNOSES
As
to
the method of
a
perforinance
test
refer to
the
item
of Peiformance
Test
Of
various
conditions caused
to
the
air
conditioning
system the character
istics revealed
on
manifold gauge
read
ing
are
shown
in
the
following
Note
In
the
following
table the
portion
smeared with ink
on
each
Condition
I
INSUFFICIENT REFRIGERANT CHARGE
I
r
I
@ @
Insufficient
cooling
Bubbles
appear
in
sight
glass
08A
I
ALMOST NO REFRIGERANT
o
@
@
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
AC209A
I
FAULTY EXPANSION VALVE
I
Slight cooling
Sweating
or
frosted expan
sionvalye
inlet
@
@
ef
lil
1
AC21QA
AC 44
Expansion
valve restricts
refrigerant
flow
Expansion
valve is
clog
ged
Expansion
valve
is in
operative
Valve
siuck
closed
Thermal
bulb
has
lost
charge
ga
scaJe
iDdicat
8
range
based
on
the
assumption
that the air
conditioning
system
is in
good
order
Corrective
action
1 Leak test
2
Repair
leak
3 Charge
system
Note Evacuate
as neces
sary
sod
recharge
sys
tem
Stop
rompr
r
immedi
ately
1 Leak
test
2
Discharge
system
3
Repair
leak
s
4
Replace
receiver drier if
necessary
5
Check oil level
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
1
Discharge
system
2
Replace
valve
3 Evacuate sod charge
system