Buick LeSabre 1965 Service Manual page 790

ACCESSORIES
OPTIONAL HEATER-AIR CONDITIONER SYSTEM 1 1 - 5 7
Components of the seal located in
the neck of the front head of the
compressor are the seal seat re-
taining ring, the seal seat "O"-
ring, the spring-loaded shaft seal
and the cast iron shaft seal seat.
The seal indexes with two flats
machined on the compressor shaft
and turns with the compressor
shaft.
A spring in the shaft seal holds
the seal against the seal seat
which is held stationary in the
neck of the compressor front head
by the seal seat retainer ring.
Because of the constant pres-
sures inside the compressor, this
surface must be protected against
damage, such as scratches and
nicks (even finger markings may
cause surface damage) to prevent
oil and/or refrigerant leaks past
this seal.
Shaft seal service parts are sup-
plied in a complete kit containing
all necessary replacement parts.
1 1 - 1 3 HEATER-AIR
CONDITIONER
CONTROLS AND
AIR DISTRIBUTION
SYSTEM—45000,
4 6 0 0 0 AND
4 8 0 0 0 SERIES
a. Heater-Air Conditioner
Controls—45000, 46000
and 48000 Series
The controls for the 45000, 46000
and 48000 Series heater-air con-
SEAT
Figure 11-71—Air Conditioner-Heater Controls - 45000, 46000 and 48000 Series
Figure 11-70-Shaft Seal Assembly
ditioner consist of two switch
levers and two slide levers (See
Figure 11-81). T h e s e controls
function as follows:
1. Climate Control Lever-This
lever operates the Outside-Rec.
and the Htr.-A/C vacuum disc
switch. This switch in turn ap-
plies vacuum to the outside—re-
circulated air door vacuum
diaphragm and the heater-air
conditioner air door vacuum dia-
phragm. In addition the lever is
mechanically linked to the com-
pressor clutch control switch.
Movement of the lever actuates
these components in the following
sequence (refer to Figure 11-73).
REC-At this position of the lever,
the compressor clutch control
switch is closed completing half
the circuit of the compressor
clutch (the FAN switch must also
be closed before the compressor
clutch will be energized). Vacu-
um is supplied to #2 port of
outside- recirculated air door
vacuum diaphragm. This causes
the door to partially open thereby
permitting the system to draw
out and recirculate air inside the
passenger compartment (see Fig-
ure 11-77).
NORM - This position maintains
the c l u t c h compressor switch
closed and applies vacuum to #1
port as well as #2 port of the
outside-recirculated air door
vacuum diaphragm. With vacuum
applied to both ports of this vacu-
um diaphragm, the door opens
completely thereby drawing on
only outside air and blocking off
the recirculated air supply (see
Figure 11-76).
VENT—In this position the com-
pressing clutch control switch is
open thereby disrupting half the
electrical circuit of the compres-
sor clutch. If the FAN switch
was closed and the air condition-
ing system operating, the com-
pressor would thus be shut off.
Vacuum is maintained at #1 and
#2 ports of the outside-recircu-
lated air door vacuum diaphragm.
The VENT position is provided so
that the driver may have uncooled
outside air from the air condi-
tioner outlets.
HTR-In this position the clutch
c o n t r o l switch r e m a i n s de-
energized and vacuum remains
applied to #1 and #2 ports of the
outside-recirculated air door
vacuum diaphragm. In addition
vacuum is applied to #1 port of
the heater-air conditioner air
door vacuum diaphragm. The
door changes position and blocks
off air flow to air conditioner
outlets and directs air flow to
heater floor outlets (see Figure
11-75).
2. FAN Lever. This lever oper-
ates the Heater & A/C Blower
switch (see Figure 11-72). When
this lever is moved from one
extreme to the other, four stops
will be felt. Moving from left to
right, the 1st stop will provide
low-low blower speed (provided
the clutch c o n t r o l switch i s
closed). If the clutch c o n t r o l
switch is open the blower will not