Cadillac 60 Series 1963 Shop Manual page 433

13-52
HEATING AND AIR CONDITIONING
2. Raise front end of car and place jack stands
under lower suspension arms.
3. Turn front wheels to right.
4. Remove right front fender rear dust shield.
5. Disconnect low pressure hose from suction
throttling valve and cap hose.
6. Disconnect vacuum hose from diaphragm.
7. Disconnect oil bleed line and external equal-
izer line from suction throttling valve.
8. Remove clamp screw securing suction throt-
tling valve to brace on front of evaporator case.
9. Unscrew flare nut fitting from rear of suc-
tion throttling valve and remove valve. Remove
clamp from valve.
10. Remove and d i s c a r d O-rings at all
connections.
b. Installation
1. Install suction throttling valve on evaporator,
using new O-ring. Tighten flare nut fitting.
2. Install clamp on valve and secure valve and
clamp to brace on evaporator case with sheet
metal screw.
3. Using new O-rings, connect oil bleed line and
external equalizer line to suction throttling valve.
4. Connect vacuum hose to diaphragm.
5. Connect low pressure hose to suction throt-
tling valve. Use new O-ring.
6. Evacuate system as described in Note 21.
7. Charge system with refrigerant as described
in Note 23, and leak test all connections.
8. Check operation of system.
9. Install right front fender rear dust shield.
10. Straighten wheels and lower car.
45. Suction Throttling Valve—Rear
Removal and Installation (75 Series)
a. Removal
1. Remove rear evaporator assembly as de-
scribed in Note 59a.
2. Remove core from rear evaporator assembly
as described in Note 60a.
3. Disconnect low pressure hose from suction
throttling valve and cap hose.
4. Disconnect vacuum hose from diaphragm.
5. Remove clamp screw securing valve to
bracket on front face of core and remove clamp
from valve.
6. Unscrew flare nut fitting from rear of valve
and remove valve.
7. Remove and discard O-rings at a l l
connections.
b. Installation
1. Install suction throttling valve on evaporator,
using new O-ring and tighten flare nut fitting.
2. Position clamp on valve and secure to brack-
et on front face of core with screw.
3. Connect vacuum hose to diaphragm.
4. Using new O-ring, connect low pressure
hose to suction throttling valve.
5. Install core in rear evaporator assembly as
described in Note 60b.
6. Install rear evaporator assembly as de-
scribed in Note 59b.
46. Suction Throttling Valve
Disassembly, Cleaning and
Assembly (Fig. 13-75)
a. Disassembly
1. Remove suction throttling valve as described
in Note 44a or 45a.
CAUTION: Due to strong compressive force
of valve spring, vacuum power unit in step 2
should be removed with extreme care.
2. Loosen jam. nut at top of valve cover and
remove vacuum power unit from valve.
3. Remove valve spring.
4. Remove flat washer, and spacer if present,
from bore in vacuum head.
NOTE: The spacer is used to compensate
for variances in spring tensions, and is not used
on all suction throttling valves.
5. Remove O-ring from vacuum unit on 75
series. Discard O-ring.
6. Remove five screws securing valve cover to
valve body and remover cover. It may be neces-
sary to rock cover back and forth to remove it.