Buick LeSabre 1965 Service Manual page 815

11 - 8 2 OPTIONAL HEATER-AIR CONDITIONER SYSTEM ACCESSORIES
CAP
VALVE
CORE
CONNECTOR - * -
EVAPORATOR PRESSURE
SERVICE VALVE
PISTON &
DIAPHRAGM
ASSEMBLY
RETAINER CUP
O-RING SEAL
VALVE BODY
PISTON
DIAPHRAGM
COVER
LOCK NUT
VACUUM
DIAPHRAGM
SCREW &
LOCK WASHER
(5)
Figure 11-91-Suction Throttling Valve (Exploded View) - 49000 Series
through line connections to pre-
vent piston from sticking on initial
operation.
(c) Evacuate and charge the sys-
tem. Leak test valve and connec-
tions. Correct any leaks.
(d) After s y s t e m has been
charged, on 49000 move air con-
ditioning temperature c o n t r o l
lever from one extreme to the
other about 12 times with system
operating to normalize the valve
diaphragm.
(e) Check operation of the suction
throttle valve, refer to subpara-
graph "f'\
h. Disassembly and
Assembly of Suction
Throttle Valve
If test indicated suction throttle
v a l v e is defective, the valve
should be overhauled as follows:
1. With valve removed from car,
loosen lock nut on vacuum dia-
phragm and turn diaphragm as-
sembly out of cover. On 49000
valve, discard "O" ring on sleeve
of diaphragm. See Figure 11-91.
NOTE: Figure 11-91 shows the
49000 Series s u c t i o n throttle
valve. The 45000, 46000 and
48000 suction throttle valve is"
basically the same except a dif-
ferent diaphragm is used and an
"O" ring is not used on the vac-
uum diaphragm.
2. Remove spring from cover.
3. Remove the five screws that
retain cover to body of valve and
remove cover.
4. Remove diaphragm and piston
assembly.
5. R e m o v e retainer cup from
diaphragm.
The diaphragm should be handled
with care to avoid damage by
scuffing, cutting or abrading the
rubber and fabric surfaces. The
piston diaphragm or the screen
and retainer in the lower portion
of the piston should not be re-
moved. The screen should, how-
ever, be examined for any foreign
material or contamination. If
necessary clean screen with a
v o l a t i l e solvent. All solvent
should be removed from parts
after cleaning.
In the event the exterior surface
of the piston is damaged such as
scored, scratched or nicked, in
such a way as to cause it to bind
in the bore, it should be replaced.
NOTE: It is recommended that
no attempt be made to scrap,
stone or crocus cloth these dam-
aged areas due to the close tol-
erance that is required in the
fitting of the parts for proper
operation. In the event the dia-
phragm is found to be damaged,
the piston assembly should be
replaced.
Examine the body bore surfaces
for any surface imperfections,
foreign material and any obvious