Pontiac Fiero 1988 Service Manual page 56

AiR CONDITIONING 1B-11
V - 5 S Y S T E M A I R C O N D I T I O N I N G D I A G N O S I S
I N S U F F I C I E N T C O O L I N G " C H A R T E "
WITH KEY ON AND ENGINE NOT RUNNING, C H E C K FOR 12 VOLTS AT THE A/C CONTROL
RELAY. S E E I L L U S T R A T I O N S FOR LOCATION.
12 VOLTS OPEN CIRCUIT
C H E C K FOR C O M P R E S S O R CLUTCH
COIL OPERATION BY APPLYING
12 VOLTS AND GROUND DIRECTLY
FROM THE BATTERY TO THE COIL
TERMINALS AT THE CLUTCH.
C H E C K THE E L E C T R I C A L CONNECTORS OF THE
TWO SWITCHES IN THE R E A R HEAD OF THE
C O M P R E S S O R ( I L L U S T R A T I O N S ) FOR PROPER
INSTALLATION AND FUNCTION.
CLUTCH D O E S NOT ENGAGE,
INOPERATIVE COIL.
CLUTCH
E N G A G E S
CONNECTORS OK
R E P L A C E C O M P R E S S O R
CLUTCH COIL ASSEMBLY.
EVACUATE AND CHARGE.
OK
CONNECTOR
PROBLEM.
C H E C K FOR 12 VOLTS AT
THE F E E D WIRE
TO THE A/C LOW P R E S S U R E
SWITCH S E E I L L U S T R A T I O N S
R E P A I R OR
R E P L A C E A S
R E Q U I R E D
X
OPEN CIRCUIT
12 VOLTS
C H E C K E L E C T R I C A L S Y S T E M AND
REPAIR AS REQUIRED. S E E SECTION
8A-64 OF S E R V I C E MANUAL.
OK
OK
C H E C K FOR E L E C T R I C A L CONTINUITY A C R O S S
THE SWITCH TERMINALS OF BOTH SWITCHES IN
THE REAR HEAD OF THE C O M P R E S S O R USING AN
OHM METER. BOTH SWITCHES SHOULD BE
C L O S E D . IF EITHER SWITCH IS OPEN,
DISCHARGE THE S Y S T E M AND R E P L A C E
THE INOPERATIVE SWITCH.
BOTH SWITCHES SHOW CONTINUITY.
R E C H E C K CONNECTORS.
OK
H20010 1B
Figure 10 V-5 A/C System Insufficient Cooling Diagnostic Procedure (4 of 4)