Datsun 1980 200SX Service Manual page 442

AIR CONDITIONER TroubleOiagnosesandCorrecrionr
TROUBLE DIAGNOSES
AND CQRRECTIONS
AIR CONDITIONER DIAGNOSES
Insufficient
cooling
Bubbles
in
sight glass
Check
refrigeration
line for
gas
leaks and
repair
leaks if any
Charge
reo
frigerant to correct
level
In
case
of
too many leaks
stop
compressor
dig
charge
the
system
evacuate and
recharge
the
system
As necessary
replace
receiver drier
Air
in
system
may
cause
bubbles
in
sight glass
System pressure and temperature of discharge air
are
abnormal Refer
to
Performance Test Diagnoses for detail
Suction pressure
is high
Discharge
pressure is
high
Expansion
valve
is open
exces
sively
Replace
expan
sian valve
Overcharge of
refrigerant
Discharge
some
refrigerant
to correct
level
Air is mixed
in Discharge
sys
tern
and
replace
drier
Evacuate and
recharge
system
Condenser
s
fin
is
dented
or
clogged
with dust
Clean
exterior
surface with
water
Suction pressure
is
low
Suction pressure
is
high
while
discharge
pres
sure
is low
Valve
or
gasket
of compressor is
damaged
Repair
or
replace
compressor
Pipe
at receiver
drier outlet has
low
temperature
Receiver drier
is restricted
Replace
receiver
drier
Fin
and
tllbe of evaporator
have
some
dents
Replace
or
repair
evaporator
No bubbles in
sight glass
With
manifold
gauge
check system
pressures
Measure temperature of
discharge
air
Refer
to
Performance
Test
Temperature of
discharge
air is ab
normal but
system pressure is
normal
Check air flow system
Check grommets
on
car s
dash
panel
for
air
leaks check
other seals
of
car
Expansion valve
is
close excessively
or gas
leakage
from thermo bulb
Replace
expansion valve
HA 39