Hudson 1955 Rambler, Technical & Service Manual

Page: 258 / 292

8 TECHNICAL SERVICE MANUAL
covered by the blower to dash duct. The air
passes over a baffle or rain shedder to prevent
water from entering the car.
The blower fan mixes the fresh and recircu-
lated air and directs it through the heater and
evaporator cores into the evaporator shroud.
The evaporator shroud air outlet door is
closed when the cowl vent damper is closed.
Therefore, the cooled air is directed up
through the ducts to the air discharge grilles
located on the instrument panel. The air then
follows the roof panel contour, down, around,
and under the front seat back to the air
recirculating duct where it is mixed with
incoming fresh air and the cycle again takes
place.
Vent—Heat
"Hornet" and "Wasp" Series
The combination fan switch and water valve
control knob is moved to the right to the
desired position. Intermediate positions are
for thermostatically controlled heat. "High"
position is for full flow of hot water through
the heater core. The damper control on the left
hand side of the steering column is moved to
the "Vent-Heat" position.
The cowl vent damper is then placed in the
open position. The inlet damper is open at the
dash panel opening and closed to the evaporator
retainer housing opening. The defroster damp-
ers are open and moved to the position closing
off the evaporator core.
Ram air enters the cowl vent, flows through
the filter and heater core. Heat is added to
the air at this time. The heated air then flows
directly to the inlet opening in the dash panel
and enters the heat distribution duct along the
toe panel where the heated air is delivered to
the car interior through the slotted openings
in the duct (Fig. 8).
FIGURE 8— "Vent-Heat" Air Flow
Ventilators and windows should normally be
closed in cold weather. but to increase
defrosting or heating
effect, the rear window or ventilator may be
opened slightly.
The air discharge outlet door is closed at
this time; the defroster door should be opened
to allow heated air to keep the windshield
defrosted.
"Rambler" Series
The combination fan and water valve control knob
is moved laterally to the right to intermediate
positions to thermostatically control the heat,
as desired, or to "High" to the "full open"
position.
The left hand damper control knob is pulled
out to close the air recirculation duct.
The right hand damper knob is pushed in to open
the cowl vent damper and evaporator shroud air
outlet door.
Ram air enters the cowl vent and passes
through the open cowl vent damper. It then passes
through the filter and heater core. The heated
air passes through the evaporator core to the
open evaporator shroud outlet door where it is
discharged out of the air outlet duct located on
the lower side of the evaporator shroud.
The evaporator shroud air outlet door in its
open position will partially block the air ducts
going to the air discharge outlets on the
instrument panel.
Defroster
"Hornet" and "Wasp" Series
The combination fan switch and water valve
control knob is moved to the right and turned
clockwise to either the "Low" or "High" position
to start the blower fan.
The damper control knob and lever is moved to
the "Defroster" position. Ram air enters the
cowl vent and is directed through the open cowl
vent damper. The air is directed through the
filter and heater core. The blower fan draws the
heated air from the heater hopper box and directs
it through the blower opening into the evapora-
tor housing.
The defroster dampers are open. This deflects
the heated air to the defroster openings in the
evaporator side plates to the ducts connected to
the two air discharge outlets located on the
instrument panel. The inlet damper is closed to
the dash panel and partially open to the heat
distribution duct. Thus a portion of the heated
air is also delivered to the front floor area of
the passenger compartment (Fig. 9).
The defroster door of the air discharge outlet
is open during defroster operation to allow the
heated air to be delivered to the windshield
surface (Fig. 10) .
"Rambler" Series
The water valve control knob is moved to the
right and the blower motor is turned on to either
"Low" or "High" speed as required.