1975 Datsun 280z FSM - Spooled up Racing

Body Electrical System
Heater cock
1. Place TEMP lever in HOT position.
2. Pull heater cock lever toward you
(HOT), and set cable wire at cock
lever.
3. Fasten cable outer with clip.
Notes:
a. Make sure that TEMP lever and
heater cock lever are in HOT position.
b. If heater cock is not set properly,
warm air may flow into the compartment
when not desired.
Fan motor power supply
1. Disconnect lead wires at connector.
2. Move ignition switch to ON
position.
3. Connect test lamp lead wire to
green wire terminal in connector plug
on dash harness side and other to
ground.
4. Make sure test lamp comes on.
Fan motor
1. Disconnect lead wires at connector.
2. Move ignition switch to ON
position.
3. Connect test lead to positive side
of fuse block power supply and other
to terminal in connector plug on fan
motor side. Another terminal for fan
motor, must be connected to earth
(body earth).
4. Make sure fan motor operates at
each fan lever position.
Air-con relay
Test continuity through the relay
with ohmmeter or test lamp. There
must be continuity between (J)- relay
body. When 12V direct current is
given to (T) - relay body, there must
be continuity between (2)-(3)- Refer
to Figure BE-89.
Fan switch
Test continuity through the switch
at each step with test lamp or ohmmeter.
Refer to following continuity diagram
for fan switch.
Wiring system
Test system continuity with ohmmeter
or test lamp. Refer to following
wiring diagram for heater and illumination
lamp.
© (LB) © (LW)
1 Heater cock lever
2 Clip
3 Cable
BE134A
Fig. BE-98 Adjusting heater cock
(LR)
INSPECTION
Inspect all parts of heater box for
damage. Refer to Trouble Diagnoses
and Corrections. For electrical system,
check wiring, fan switch resistor and
fan motor for continuity.
If fan motor fails to rotate check
following items.
1. Fnse and fusible link.
2. To check for burned out fuse,
follow same procedure as for ordinary
fuses using a circuit tester or test lamp.
3. Loose wire connection.
1
2
3
4
OFF LOW
o
o
Mea
o
6
Hi
o
o
Fig. BE-99
BE135A
Fan switch
BE-53