Pontiac TRANS AM 1977 Service Manual page 76

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CUSTOM AIR CONDITIONING
12. Low b h w e r only 4 to G
(compressor clutch
inoperative)
10 volts or more Faulty A/C control
Under
10
volts Faulty wire from low
blower delay (in-car
ambient) switch to A/C
control.
13.
Compressor clutch
See symptom #2
and blower motor
inoperative
14. Comp. clutch
operates in norm.,
max., bi-level or
defrost, but not
in all
Faulty A/C control.
15. Compressor clutch a. 6 to G 10 volts or more Faulty clutch or
inoperative ground, or compressor
(blower OK) clutch harness.
A/C control in norm.
b. 8 to G
Under 10 volts Go to step b.
10 volts or more Faulty thermostatic
switch or wire to clutch.
c. 7 to G Under 10 volts Go to step c.
10 volts or more Faulty refrigerant pres-
sure switch, wire from
refrigerant pressure
switch to thermostatic
switch, or low refrigerant
charge.
Faulty A/C control or lead
from control to refrigerant
pressure switch.
Under 10 volts