1975 Datsun 280z FSM - Spooled up Racing

Noisy
Insufficient cooling
Blower does not
rotate.
Compressor OFF
Compressor ON
Bubbles in sight glass
No bubbles in sight glass
Refer to "Blower
Motor
Diagnoses".
Blower makes
noise.
Repair or replace
blower.
Bearings of compressor
clutch or idler
pulley make noise.
Repair.
Compressor
itself makes
noise.
Repair or
replace compressor.
Belt is loose.
Adjust belt.
When engine
rpm is changed,
there are resonant
sounds.
Retighten compressor
bracket
bolts.
Piping is resonating.
Add
cramp.
Check refrigeration line
for gas leaks, and repair
leaks if any. Charge refrigerant
to correct
level. In case of too
many leaks, stop compressor,
discharge the
system, evacuate and
recharge the system.
As necessary, replace
receiver drier.
Air in system may
cause bubbles in sight
With manifold gauge, check system pressures.
Measure temperature of discharge air.
Refer to "Performance Test".
Temperature of
outside air
oF
Suction pressure
psi
Head pressure
psi
Temperature
difference (Outside
air • discharge air)
oF
70
20 to
28
138 to
168
18 to
24
80
23 to
33
152 to
185
19 to
26
90
28 to
38
175 to
209
23 to
30
100
37 to
48
201 to
235
27 to
35
• Engine speed: 1,500 rpm
• FAN lever: 4
• AIR lever: A/C
• TEMP lever: Max. cold
System pressure and temperature of discharge air are
abnormal. Refer to "Performance Test Diagnoses"
for detail.
Temperature of discharge
air is abnormal, but system
pressure is normal.
_C
Strainer in pipe
line is restricted.
Replace strainer.
Pipe at receiver
drier outlet has
low temperature.
Receiver drier is
restricted. Replace
receiver drier.
Suction pressure is low.
X
Fin and tube of
evaporator have
some dents.
Replace or repair
evaporator.
Expansion valve is
close excessively,
or gas leakage from
thermo bulb.
Replace expansion
valve.
Suction pressure
is high.
Expansion valve
is open excessively,
or expansion
O-ring is damaged.
Replace expansion
valve.
Head pressure is
high.
Overcharge of refrigerant.
Discharge some of refrigerant
to correct level.
Air is mixed in. Discharge
system, and replace drier.
Evacuate and recharge
system.
Condenser's fin is dented
or clogged with dust.
Clean exterior surface
with water.
Suction pressure is
high, while head is
low. •
Valve or gasket of
compressor is damaged.
Repair or replace compressor.
Check air flow system.
Refer to "Air Conditioner
Operation Chart".
Check grommets on
for air leaks; check