1975 Datsun 280z FSM - Spooled up Racing

Air Conditioning
VACUUM SYSTEM DIAGNOSES-VENT POSITION
Air comes out of ventilation outlets.
Air does not come out of ventilation outlets.
Air comes out of heater outlets,
too.
Air comes out, while outside
air does not come in.
Mode door actuator (Dj) is
operating.
Remove hose of mode door
actuator "Di".
Disconnect hose of actuator of
air intake door, and connect it
to vacuum tester.
Mode door is operating.
Blower does not
run.
X
Not normalized yet
Check mode door for
condition of return
spring.
When spring is in order,
replace actuator.
Light ON
Check hose, and
when it is found
normal, replace
check valve.
Normalized
Set air lever in another
position and check
vacuum hose for proper
piping.
Replace vacuum selector
valve when hose piping
is correct.
X
Light OFF
Check connector
plug and hose.
If hose is damaged.
replace it.
X
Light ON
Check hose
connection, and
when it is found
normal, replace
actuator.
Light ON
Check vacuum
hose for twist,
dent and leak.
When it is found
normal, replace
selector.
X
Light ON
Light OFF
~
Disconnect
hose "S" from
vacuum selector
valve and connect
to vacuum
tester.
Light OFF
Disconnect inlet
hose of magnet
valve (vacuum
source), and
connect to
vacuum tester.
Light OFF
Disconnect hoses of mode door
actuator (D! and D 2 ), and
connect to vacuum tester.
Light ON
Set air lever in
another position
and check vacuum
hose for proper
piping. Replace
selector when hose
piping is correct.
Light OFF
Check mode door
for condition of
return spring, and
when it is found
normal, replace
actuator.
Refer to "Blower
Motor Diagnoses".
Check with 12-
volt test light
whether electric
current flows to
magnet valve.
When it is found
normal, replace
magnet valve.
Connect vacuum
tester to hose
on the inlet of
vacuum tank.
Light ON
Light OFF
Check hose for
twist, dent and
leak. Check tank
for leak and connector's
connection.
Repair or
replace parts as
required.
Connect vacuum
tester to hose
on inlet side of
check valve.
Vacuum tester: Tester light keeps
OFF unless normal vacuum
level exists in each check
point.
AC-52