S-SERIES AIR CONDITIONING -- HEATER SYSTEM
The heater core, constructed of ribbon fins (Figure 5), is
mounted in the unit housing. Engine coolant is circulated
through the core and heat from the coolant is dissipated
by air circulated through the core fins.
Hot Water Flow Control Valve
The hot water flow control valve (heater shutoff) is
attached to the floor of the blend-air unit housing. It is
placed in the heater core inlet hose and serves to meter
the flow of hot engine coolant through the core. The flow
control is accomplished by an adjustable link connecting
the valve to the blend-air door which is controlled by a
cable connected to the control panel HTR lever.
The blower fan (Figure 6) provides air circulation through
the heater and delivers the treated air to the cab interior.
Figure 5. - Heater (Only) Unit Heater Core - Exploded View