Pontiac FIREBIRD 1972 Service Manual page 209

1B-22 1972 PONTIAC SERVICE MANUAL
TEST G
2
(A) WlTH ENGINE R U N N I N G AT OPERATING TEMPERATURE,
(8) NORMAL, BLOWER RANGE SWITCH SET TO HI, TEMPERATURE CONTROL SET TO MAXIMUM A/C POSITION
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CHECK FOR OPEN CIRCUIT I N SENSOR STRING A N D TEMPERATURE CONTROL SWITCH.
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TEST G,
SENSOR STRING O K
CHECK FOR PROGRAMMER ASS'Y. ARM MOVEMENT AS TEMPERATURE CONTROL IS ROTATED M A X I M U M A/C AND MAXIMUM HEAT.
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(A) WlTH ENGINE R U N N I N G AT OPERATING TEMPERATURE
0)
NORMAL, BLOWER RANGE SWITCH SET TO HI,
TEMPERATURE
CONTROL SET TO MAXIMUM A/C
/
ICI CHECK VACUUM CIRCUIT TO DIVERTER DOORS. PINK AND PINK STRIPE HOSES SHOULD B E VENTED. TAN A N D TAN STRIPE HOSES SHOULD
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OPEN I N SENSOR STRING
REPAIR OR REPLACE AS NECESSARY.
PROGRAMMER ARM MOVES
-
ADJUST OR REPAIR TEMPERATURE DOOR OR CAM ASS'Y. AS NECESSARY.
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VACUUM TO DOOR DIAPHRAGM
N O VACUUM
CHECK FOR LEAKY DIAPHPAGM AND/OR BINDING DOORS. REPAIR OR REPLACE AS NECESSARY. CHECK FOR VACUUM AT PORTS 6 A N D 7 O F PROGRAMMER VACUUM VALVE.
PROGRAMMER ARM DOES N O T MOVE
SEE PROGRAMMER DIAGNOSIS.
N O VACUUM
- -
CHECK FOR VACUUM AT PORT 1 0 O F CONTROL PANEL VACUUM VALVE.
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CHECK FOR LEAK OR RESTRICTION I N HOSE.
VACUUM
CHECK FOR LEAK OR RESTRICTION IN HOSES.
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N O VACUUM
REPLACE CONTROL PANEL VACUUM VALVE.
N O VACUUM
CHECI(ACUUM AT BLACK HOSE TO PORT 5 OF PROGRAMMER VACUUM VALVE.
TEST H
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(A) WITH ENGINE R U N N I N G AT OPERATING TEMPERATURE.
(0) DE-FOG
,
BLOWER RANGE SWITCH SET TO HI, TEMPERATURE CONTROL SET TO MAXIMUM A/C
(C) CHECK VACUUM CIRCUIT TO DEFROSTER DOOR. BLUE HOSE SHOULD HAVE VACUUM.
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VACUUM
REPAIR OR REPLACE BLUE HOSE TO DEFROSTER AS NECESSARY.
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TEST I
VACUUM TO DEFROSTER DOOR
REPLACE DEFROSTER DOOR DIAPHRAGM. CHECK FOR BINDING DOOR.
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N O VACUUM
- -
REPLACE CONTROL PANEL VACUUM VALVE.
N O VACUUM TO DEFROSTER DOOR
- -
CHECK FOR VACUUM AT PORT
9
OF CONTROL PANEL VACUUM VALVE.
(A) WlTH ENGINE R U N N I N G AT OPERATING TEMPERATURE,
(0) DEFROST, BLOWER RANGE SWITCH SET TO HI
(C) USING A 12 VOLT TEST LAMP OR A VOLTMETER, WlTH ONE PROBE TO GROUND
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(INSERT OTHER PROBE INTO PURPLE WIRE AT DE-ICE SWITCH ON CONTROL PANEL.
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TEST LlGHT LIGHTS
INSERT PROBE INTO PURPLE WlRE AT 6-CONNECTOR PLUG O N PROGRAMMER.
REPLACE DE-ICE SWITCH.
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TEST LlGHT DOES N O T LlGHT
CHECK WIRING BETWEEN CONTROL PANEL A N D PROGRAMMER.
TEST J
PERFORM TEST H I N DEFROST INSTEAD OF DE-FOG
TEST K
(A) WlTH ENGINE R U N N I N G AT OPERATING TEMPERATURE,
(0) DEFROST,BLOWER RANGE SWITCH SET TO LO
(C) CHECK VACUUM CIRCUIT BETWEEN CONTROL PANEL VACUUM VALVE A N D DUAL DIAPHRAGM AT AIR INLET DOOR. THE GREEN HOSE SHOULD HAVE VACUUM.
REPLACE DUAL DIAPHRAGM.
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N O VACUUM
C~ECKFORVACUUM
AT PORT 5 OF CONTROL PANEL VACUUM VALVE.
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CHECK FOR LEAK OR RESTRICTION I N GREEN HOSE
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N O VACUUM
CHECK FOR VACUUM AT BLACK HOSE TO PORT
4.
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VACUUM
REPLACE PROGRAMMER VACUUM VALVE.
VACUUM
REPLACE CONTROL PANEL VACUUM VALVE.
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ACUUM AT PORT 7 OF COI\.TROL PAhEL VAC,JM VA-VE.
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N O VACUUM
CHECK FOR VACUUM AT PORT 10 0 ; PROGRAMMER VACUUM VALVE.
VACUUM
CHECK FOR VACUUM AT BLACK HOSES TO PORT 1 O F PROGRAMMER VACUUM VALVE.
N O VACUUM
CHECK BLACK HOSE TO PORT 10 FOR LEAK OR RESTRICTION.
Fig. 18-19 ATC Diagnosis Guide
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VACUUM
CHECK FOR LEAK OR RESTRICTION I N HOSES BETWEEN CONTROL PANEL A N D PROGRAMMER.
N O VACUUM
REPLACE CONTROL PANEL VACUUM VALVE.