GMC 1976 ZEO 6083 Maintenance Manual page 622

valves which override the height control valve. These
valves allow the operator to raise or lower each side
of the rear suspension by adjusting the controls
located to the right of the steering wheel at the lower
portion of the dash panel. A warning light (located
in the tell-tale warning light panel) and buzzer
(located behind the instrument panel, Figure 26, re-
mind the operator to set the power level controls to
the "TRAVEL" position before driving the vehicle.
A 30 amp circuit breaker, located in the fuse panel,
protects the electrical system . For diagnosis and re-
pair procedures, see Section 4, Rear Suspension .
HEATING AND AIR CONDITIONING
The heating and air conditioning control circuit
is protected by a 25 amp fuse located in the fuse
panel. The heater blower uses either a 30 amp fuse
or a fusible link (later models) . Both the fuse or the
fusible link are installed as part of the heater wiring
harness . The heater blower relay is mounted above
the horn relay on the electrical component mounting
plate, refer to Figure 42 . Diagnosis and component
replacement are discussed in Section 1, Body, Heat-
ing and Air Conditioning .
Disconnect Coolant Level Probe
Sensor at Radiator . Ignition switch
in "RUN" position, engine not run-
ning .
Light Glows
Module OK . Check for grounded
probe sensor wire .
"COOLANT LEVEL" INDICATOR DIAGNOSIS
Light Does
Not Glow
Check tell-tale indicator fuse and
replace if necessary.
Check for grounded circuit between
probe sensor and module . If ground-
ed circuit is found, repair . If no
defect in wiring is found, replace
module .
Remove lead f rom probe sensor at
radiator and connect to a good ground .
Replace
Probe Sensor
at Radiator
Light Glows All The Time
Coolant Level OK
Light
Still Glows
Replace Module
Figure 23-"Coolant Level" Indicator Diagnosis
CHASSIS ELECTRICAL 12- 1 7