Pontiac TRANS AM 1977 Service Manual page 72

CUSTOM AIR CONDITIONING 1 8-2 1
C.C.O.T. A/C SYSTEM DIAGNOSTIC PROCEDURE
"INSUFFICIENT COOLING"
PERFORMANCE PRESSURE-TEMPERATURE CHART
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REFRIGERANT CHARGE (SEE FIG. 18-17)
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262-310 C
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262 310 C
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' J u r l belore compressor disengages ..At sea level
'DISCHARGE AIR
TEMPERATURE-
LEFT CENTER OUTLET
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SYSTEM
1
1
X SERIES
ASTRE
SUNBIRD
A
&
G SERIES
B
SERIES
F SERIES
X SERIES
ASTRE
SUNBIRD
OUTLET TEMP. O.K. OR TOO
COLD AS PER CHART
(0.K.)
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ON CONTINUOUSLY
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OUTLET TEMP. HIGH
AS PER CHART
CHECK FOR MISSING
EXPANSION TUBE (ORIFICEI
39-44 F
283-303 C
41-43 F
283 2% C
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n
CHANGE BLOWER SPEED
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CHECK ACCUMULATOR PRESS.
TO LOW, AND OBSERVE (AS PER CHART)
ACCUMULATOR AND
EVAPORATOR PIPES FOR
FROST
HIGH TO NORMAL
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A
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PLUGGED EXPANSION TUBE (ORIFICE)
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CHECK COMPRESSOR CYCLING
REPAIR OR REPLACE, REPLACE ACCUMULATOR ASM. AND
p i z i q
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EVACUATE & RE-CHARGE SYSTEM
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SYSTEM
SYSTEM DEFECTIVE THERMOSTATIC I0.K.)
I0.K.I SWITCH
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REPLACE
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CHECK COMPRESSOR INLET SCREEN
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CYCLES ON AND OFF
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24- PSl
165-186 tPa
24 27 prl
165 186 kPa
2 4 ~ 2 7 psc
165186 kPa
40.45 F
276-310 C
42-44 F
290~303 C
38 45 F
262 310 C
38 45 F
262 310 C
3 8 4 5 F
262 310 C
38 45 F
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REPLACE
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SYSTEM
(0.K.I
41-46 F
283-317 C
42-44 F
290 303 C
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INSTALL EXPANSION TUBE (ORIFICE1
EVACUATE & RE-CHARGE
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REPAIR OR REPLACE SCREEN. SYSTEM OVER-CHARGED
PSI
165-186 kPa
24-27 p r m
165-186 kPa
24-27 pr8
165-186 kPa
43-48 F
296-331 C
43-45 F
296 310 C
38-45 F
262-310C
38 45 F
262 310 C
38 45 F
262-310 C
38-45 F
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REPLACE ACCUMULATOR ASM. EVACUATE & RE-CHARGE
SYSTEM EVACUATE & RE-CHARGE
(0.K.I
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SYSTEM
SYSTEM (0.K.)
(o.K.)
1076
Fig. 1 B-20C 1977 C.C.O.T. System Diagnostic Procedure
45-50 F
310-345 C
4 3 4 5 F
296 310 C