Cigar-Cigarette Lighter; Heating System (Without Automotive Air Conditioner) - GMC 1975 Motorhome Operating Manual

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Automotive Heating System Controls
(with Type 1 Fan Switch)
The auxiliary (living area) battery will re-
charge itself whenever the motor generator is
running, or whenever your MotorHome is con-
nected to an external power source (see page 30),
in addition to being recharged while the vehicle's
engine is running.
CIGAR-CIGARETTE LIGHTER
Push the lighter in all the way to operate .
When it is heated sufficiently to use, it is de-
signed to "snap" back to normal position with
noticeable sound. Avoid holding the lighter in by
hand while it is heating .
For added safety, the cigar-cigarette lighter
has a heat-sensitive terminal which is designed
to melt and break the circuit if the lighter be-
comes overheated.
HEATING SYSTEM (WITHOUT
AUTOMOTIVE AIR CONDITIONER)
The heating system controls are located on
the instrument panel to the right of the steering
column. There are three separate controls;
"FAN" lever to control speed of blower operation ;
"RECIRC," "COLD," "HOT" lever to control
temperature of air; "OFF," "VENT," "HEATER,"
"DEF" lever to control direction of air
flow .
The
"FAN" lever works vertically and the other two
levers work horizontally. The three levers may
be placed in any combined position to deliver
the climate conditions most desirable at any
given time.
" TYPE 1 "FAN"-The fan switch has four
positions ; "OFF" and three blower speeds
ranging to "HI" and two unmarked posi-
tions between "OFF" and "HI." The fan will
not operate unless the top lever has been
moved from the "OFF" position, and in order
2 2
Automotive Heating System Controls
(with Type 2 Fan Switch)
to operate the fan in the "HI" position the
engine must be running .
" TYPE 2 "FAN"-The fan switch has four
positions ; "LO" and three blower speeds
ranging to "HI." Fan will operate whenever
the key is in the "RUN" or "ACCESSORY"
position. In order to operate the fan in the
"HI" position the engine must be running .
" "OFF," "VENT," "HEATER," "DEF"-With
the lever in the "OFF" position the system is
off. With the lever in the "VENT" position
100% outside air enters the driver's com-
partment. The air enters through the dash
mounted outlets and through the heater out-
lets. Temperature of incoming air may be con-
trolled by moving the "RECIRC," "COLD,"
"HOT" (temperature) lever to desired posi-
tion. Any one of the blower speeds may be
selected.
With the lever in the "HEATER" position,
air will flow through the heater floor distribu-
tor outlet (with slight
flow
of air to the de-
froster outlet) . For maximum heat, move
temperature lever to "HOT" position and
"FAN" switch lever to "HI" position. Heat-
ing system output can be varied by moving
temperature lever and "FAN" lever to differ-
ent positions.
With the lever in the "DEF" position, the sys-
tem operates the same as in the "HEATER"
position except most of the air
flow will
be
through the defroster outlets at the wind-
shield.
" "RECIRC," "COLD," "HOT"-This lever, used
in conjunction with the system selector lever
("OFF," "VENT," "HEATER," "DEF") and
the "FAN" switch lever, will control the tem-
perature of the output air being distributed.

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