Buick LeSabre 1965 Service Manual page 763

11 - 3 0 HEATER SYSTEM
ACCESSORIES
on each of the floor side kick
pads. The opening and closing of
the vent doors is controlled by a
control knob on the instrument
panel.
1 1 - 6 DESCRIPTION AND
OPERATION OF
HEATER SYSTEM
( 4 9 0 0 0 SERIES)
The heater system for the 49000
Series cars is essentially similar
to the system for 45000, 46000
and 49000 Series cars in so far as
it is an air-mix type system, and
the air flow is basically the same.
The heater system has six major
assemblies: (1) a blower assem-
bly (see Figure 11-34) which
houses the blower fan and motor;
(2) an outside air door and case
assembly which contains the out-
side air door, blower resistor as-
sembly and the vacuum diaphragm
to operate the door; (3) the air
inlet assembly which houses the
temperature door; (4) a heater
assembly which contains the heat-
er core; (5) console center duct
and adapter assemblies (see Fig-
ure 11-35); (6) a heater and de-
froster control assembly which
controls regulation of doors and
blower motor (see Figure 11-36).
The flow of coolant thru the
heater system is as shown in
Figure 11-37. A vacuum operated
water valve shuts off flow of cool-
ant thru heater core when sys-
tem is inoperative.
a. Description of Air Flow
The air flow (see Figure 11-38)
is similar to 45000, 46000 and
48000 Series heater system, ex-
cept that the temperature door
and outside air door are respec-
tively located in the air inlet
assembly and the outside air door
and case assembly. There is a
constant flow of heat to the rear
outlets as well as the front out-
lets when air is being directed
to the floor of the car.
BLOWER ASSEMBLY
rBLOWER MOTOR GROUND WIRE
PLAIN VACUUM HOSE (SOURCE)
GREEN VACUUM HOSE
(OUTSIDE AIR DOOR)
FENDER SKIR
Figure 11-37—Vacuum Hose and Water Hose Routing - 49000 Series
b. Description and
Operation of Heater
System Controls
The heater system for the 49000
Series cars has three control
l e v e r s : HEATER lever, DE-
FROSTER lever, and BLOWER
lever (see Figure 11-39). They
function as follows:
1. HEATER Control Lever - This
lever regulates the positioning of
the temperature door, outside air
door, closes one of the electrical
switches necessary for operation
of the blower motor, and also
opens the water valve. Initial
movement of the lever from OFF
position applies vacuum to the
vacuum diaphragms controlling
the outside air door and water
valve and closes a switch in the
blower circuit. Further movement
of the lever opens the tempera-
ture door.
2. DEFROSTER Control Lever -
This lever regulates the position-
ing of the defroster door. In
addition, similar to the HEATER
control, the lever also opens the
outside air door and closes a
switch in the blower circuit. In-
itial movement of the lever just
past OFF position applies vacuum
to the outside air door vacuum
diaphragm and closes one of the
blower circuit switches. Further
movement of the lever opens the
defroster door.
3. BLOWER Switch Control - This
control operates a three position
blower switch. First, second and
third positions of lever respec-
tively provide low, medium, and
high blower speeds.
NOTE: For blower motor oper-
ation both circuit switches (the
switch controlled jointly by the
HEATER and DEFROSTER con-
trol levers, and the switch con-
trolled by the BLOWER lever)
must be closed.
11-7 SERVICING
HEATER SYSTEM
COMPONENTS
(45000, 46000 and
48000 SERIES)
a. Defroster Cable
Installation and
Adjustment
1. Assemble control cable to in-
strument panel control (see Fig-
ure 11-40).