Pontiac FIREBIRD 1972 Service Manual page 78

CUSTOM AIR CONDITIONING 1A-19
Fig. 1 A-1 6 Schematic
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Low Refrigerant Protection System
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AIC SWITCH AMBIENT SWITCH
HEATER FUSE LINK
Thermal limiter blown during charging of
refrigerant system.
SUPERHEAT
Faulty superheat shut-off switch. (See
Superheat Shut-Off Switch Check.)
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I
1
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I
CLUTCH
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J
COIL
THERMAL LIMITER
Disconnect thermal limiter and place jumper
between terminals B and C of connector plug
during charging. Replace thermal limiter.
Replace superheat switch according to procedure,
recharge system and replace thermal limiter.
SWITCH
CONTACTS
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SUPERHEAT SHUT-OFF SWITCH CHECK
On Car:
1. Disconnect electrical connector at superheat switch
in rear head of compressor.
2. Check for electrical continuity from switch terminal
to ground. An open circuit should be read between
switch terminal and ground.
Off Car:
With superheat shut-off switch removed, the switch con-
tacts (terminal to housing) should be open at atmospheric
pressure and temperatures below 100°F. With switch in
hot bath (150°F. or above), switch contacts should close.
If switch contacts are not open and closed as described in
preceding paragraph, the switch is defective and must be
replaced.