Chevrolet 1980 Light Duty Truck Service Manual page 60

1B-14 AIR CO N D ITIO N IN G
INLET PIPE COLDER
THAN OUTLET PIPE
Leak Check System
NO LEAK FOUND
Add 1 Lb. o f R efrigerant— 12
T hen Check Clutch C ycle Rate
ABOVE 8 CYCLES
PER MINUTE
'D is c h a rg e System and Check For
P lugged O rifice
i
Evacuate & Charge
i
System
(O.K.)
INLET AN D OUTLET
SAM E TEMP., OR OU T­
LET COLDER THAN INLET
I
A d d One M ore Pound of
R efrigerant— 12
System
(O.K.)
| LEAK FOUND |
R epair as Necessary
i
Evacuate & Charge
System
(O.K.)
I ABOVE 345 kPa (50 PSI)
8 CYCLES PER
"D ischarge S ystem and Check fo r
M IN. OR LESS
Plugged O rifice o r H igh Side
Feel Inlet & O u tle t
Pipes A gain
INLET PIPE COLDER
THAN OUTLET PIPE
A dd 1 Lb. R efrige ran t— 12 and Feel
Inlet & O utlet Pipes A gain
INLET A N D OUTLET
SAM E TEMP., OR O U T ­
LET COLDER THAN INLET
--------- 1 - ---------
A d d One M ore Pound of
R efrig era nt— 12
System
(O.K.)
Chart 1 B-4-Pressure Cycling CCOT System Diagnosis
----------------------------- 1 OFF ALL THE TIM E |
A tta ch Fused J u m p e r W ire fro m C o m pre ssor H ot Lead to
P ositive ( + ) B attery Post and Check C o m p re ss o r
NOT ENGAGED
A p p ly External G ro un d to C om pressor,
if C lutch is S till N o t E ngaged R em ove
C lutch & R epair as per S ervice M anual
I
System
(O.K.)
BELOW 345 kPa (50 PSI)
Check H igh Side R efrig e rant
Pressure
R estriction
I
Repair or Replace.
Evacuate & Charge
i
System
(O.K.)
BELOW 345 kPa (50 PSI) I
Lost Charge
Leak Test & Repair
Evacuate & Charge
i
System
(O.K.)
INLET PIPE COLDER
THAN OUTLET PIPE
'D is c h a rg e S ystem and Check
fo r P lugged O rifice
Evacuate & Charge
System
(O.K.)
O p era tio n
R em ove J u m p e r and Check R e frigerant
Pressure at A c c u m u la to r Fitting
ABOVE 345 kPa (50 PSI)
J u m p Pressure S w itch.
Does C o m pressor Run
O pen C ircu it,
Pressure
B roken W ire,
S w itc h
I
etc. R epair
as N ecessary
R eplace.
i
* Do N ot D ischarge
System
System , T here is a
(O.K.)
S chrader V alve
in th e F ittin g
System
(O.K.)
LIG H T T R U C K S ER V IC E M ANUAL