Pontiac Fiero 1988 Service Manual page 59

1B-14 AIR CONDITIONING
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 D"
INSTALL G A G E S E T AND C H E C K C O M P R E S S O R CYCLING P R E S S U R E
C O M P R E S S O R SHOULD C Y C L E ON AT 280-350 kPa
(41-51 PSI) CYCLE OFF A T 140-190 kPa (20-28 PSI)
C O M P R E S S O R RUNS
CONTINUOUSLY
WITHIN LIMITS
C Y C L E S HIGH OR LOW ON
A B O V E 350 kPa (51 PSI) OR O F F
BELOW 140 kPa (20 PSI)
DISCONNECT BLOWER WIRE A N D CHECK
FOR COMPRESSOR C Y C L I N G O F F
A T 140-190 kPa (20-28 PSI)
P R E S S U R E F A L L S BELOW
140 kPa (20 PSI)
C O M P R E S S O R C Y C L E S
WITHIN LIMITS.
INOPERATIVE P R E S S U R E CYCLING
SWITCH-REPLACE. DO NOT
DISCHARGE S Y S T E M .
C Y C L E S O F F A T 140-190 kPa (20-28 PSI)
WILL NOT PULL DOWN TO P R E S S U R E .
INOPERATIVE P R E S S U R E CYCLING
S W I T C H - R E P L A C E . DO NOT
D I S C H A R G E S Y S T E M .
OK
R E C O N N E C T BLOWER MOTOR WIRE
OK 1. S E T A/C CONTROL TO MAX, F U L L C O L D , AND HIGH BLOWER.
2. C L O S E D O O R S AND WINDOWS O F V E H I C L E .
3. RUN ENGINE AT 2000 RPM F O R 5 MINUTES.
4. U S E AUXIL IARY FAR IN FRONT O F V E H I C L E .
INSTALL T H E R M O M E T E R IN A/C O U T L E T AND C H E C K S Y S T E M P E R F O R M A N C E
( S E E S Y S T E M P E R F O R M A N C E CHART BELOW AND R E F E R TO CHART E).
PERFORM /IANCE CHART FOR C.C.O.T. S Y S T E M S
T E M P E R A T U R E O F
AIR ENTERING
°F
70
80 90 100
C O N D E N S E R
(°C)
(21) (27) (32) (38)
C O M P R E S S O R O U T PSI 135-170 165-200 200-245
245-300
P R E S S U R E (KPA) (950-1200) (1150-1400) (1400-1700) (1700-2050)
ACCUMULATOR PSI 22-28 22-29
26-35 30-40
P R E S S U R E (KPA) (150-193) (150-200) (180-240) (205-275)
AVERAGE A/C
°F 36-43 36-43 36-43 42-48
AIR D I S C H A R G E
(°C)
(2.2-6.0)
(2.2-6.0)
(2.2-6.0) (5.5-9.0)
H 2 0 0 1 4 - 1 B
Figure 13 C.C.O.T. A/C System Insufficient Cooling Diagnostic Procedure (3 of 4)