Pontiac Fiero 1988 Service Manual page 58

AIR CONDITIONING 1B-13
C.C.O.T 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 B "
CHECK FOR COMPRESSOR CLUTCH COIL OPERATION BY APPLYING
12 VOLTS DIRECTLY FROM THE BATTERY TO THE COIL HOT LEAD.
T
NOT ENGAGED
ENGAGED
APPLY EXTERNAL GROUND TO
COMPRESSOR ASSEMBLY.
REMOVE JUMPER AND CHECK SYSTEM
PRESSURE AT THE ACCUMULATOR.
NOT ENGAGED
BELOW 350 kPa (50 PSI)
REPAIR CLUTCH COIL
OK
ABOVE 350 kPa (50 PSI)
CHECK HIGH SIDE
SYSTEM PRESSURE.
ABOVE 350 kPa (50 PSI)
SEE SECTION 8A OF
SERVICE MANUAL FOR
ELECTRICAL DIAGNOSIS
BELQW35Q kPa (50 PSI)"]
DISCHARGE SYSTEM AND CHECK FOR PLUGGED
ORIFICE OR HIGH SIDE RESTRICTION.
REPAIR AS REQUIRED
EVACUATE AND CHARGE.
OK
LOST CHARGE-LEAK TEST,
REPAIR AS REQUIRED
EVACUATE AND CHARGE.
I
OK
C . C . O . T . 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 C "
X
ADD .45 kg (ONE LB) OF REFRIGERANT-12
AND THEN CHECK CLUTCH CYCLE RATE.
— — — ~ i .
MORE THAN 8 CLUTCH CYCLES
PER MINUTE.
8 OR LESS CLUTCH CYCLES PER MINUTE.
DISCHARGE SYSTEM
AND CHECK FOR
PLUGGED ORIFICE
FEEL INLET AND OUTLET PIPES AGAIN.
REPAIR AS REQUIRED
EVACUATE AND CHARGE.
INLET AND OUTLET
SAME TEMPERATURE
OR OUTLET COLDER
THAN INLET
OK
INLET PIPE COLDER
THAN OUTLET PIPE.
ADD .45 kg (ONE LB) OF
REFRIGERANT—12.
OK
ADD .45 kg (ONE LB) OF
REFRIGERANT—12.
i
DISCHAF
ANDC
PLUGGE
IGE SYSTEM
HECK FOR
ED ORIFICE.
OK OK REPAIR AS REQUIRED
EVACUATE AND CHARGE.
H 2 0 0 1 3 1B
Figure 12 C.C.O.T. A/C System Insufficient Cooling Diagnostic Procedure (2 of 4)