S-SERIES AIR CONDITIONING - HEATER SYSTEM
Control Unit, Switch and Cables
Major functions of the heater systems are controlled from
the control unit assembly (Figure 13). The control panel
has two levers and a blower switch.
The HTR lever operates the hot water flow control valve
and the blend door to regulate cab heating. The lower
DEFROST and CAB AIR outlets.
Separate controls (not in the control unit) are provided
for operating the fresh air ventilation system and the
driver floor heat dumps.
The blower switch is a four-position switch to control the
blower motor to OFF, L, M, or H.
The ventilation system is controlled by rotating the VENT
knob located to the left of the center instrument panel air
outlets. The driver floor heat dump is cable operated
from a push-pull control located at the upper left hand
corner of the instrument panel.