Pontiac FIREBIRD 1972 Service Manual page 145

1A-86 1972 PONTIAC SERVICE MANUAL
P.O.A. V A L V E
Fig. 1A-103 B Series Evaporator and Blower Assembly
2. Discharge refrigerant system.
3. Disconnect superheat switch electrical connector.
4. Remove switch retaining ring (Fig. 1A-28) using J-
5403 internal snap ring pliers.
5. Remove switch from compressor rear head by pulling
on terminal housing groove with 5-9393 seal seat
remover and installer.
6. Remove O-ring seal from switch cavity in rear head
using 5-9553 O-ring removal tool or equivalent.
7. Check superheat shut-off switch as described in
Diagnosis portion of this section and replace switch
if necessary.
8. Check superheat switch cavity and O-ring groove
(Fig. 1A-102A) in the rear head for dirt or foreign
material and clean if necessary. Install new O-ring
coated with clean refrigerant oil into groove in switch
cavity.
9. Lubricate superheat switch housing with clean refrig-
erant oil and carefully insert switch into switch cavity
until switch bottoms in cavity. 5-9393 seat seat
remover and installer may be used to install the
switch. NOTE: Switch terminal is mounted in glass
insulation and switch must be handled with care.
Using 5-5403 snap ring pliers, install switch retaining
ring with high point of curved sides adjacent to the
switch housing. Be sure retainer ring is properly
seated in the switch cavity groove.
Check for electrical continuity between superheat
switch housing and compressor rear head.
Evacuate, recharge and leak test the refrigerant sys-
tem. Repair any leaks, check and add refrigerant oil
as required and .assure proper operation of system.
Check electrical continuity between superheat switch
terminal and housing to insure that switch contacts
are open (no continuity). Connect switch terminal
connector.
Remove jumper from thermal limiter connector, re-
place limiter if fuse link is open (no continuity be-
tween terminals B and C) and reconnect limiter
connector.