Chevrolet Light Duty Truck 1973, Service Manual

Page: 106 / 979

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ANUAL
C O M P R E S S O R D I A G N O S I S
COMPRESSOR NO T EN G A G E D .
COMPRESSOR E N G A G E D
BU T NO T O P E R A T IO N A L .
NO V O LT A G E A T
COMPRESSOR C O IL.
PRO PER V O L T A G E
TO
COMPRESSOR C O IL.
CLU TCH S LIPP IN G .
B E L T SLIPPIN G .
HIGH TO RQ U E CO M PRESSO R.
(S E IZ E D )
Retrace electrical circuit back to source of power loss. (See wiring diagrams).
C-K Models:
Check for defective discharge Pressure Switch by jumping switch connector terminals. If compressor
operates, check for low refrigerant charge. If charge
is
satisfactory, switch is defective-replace.________
Check fo r proper ground and
good clean electrical contact
at term inals.
Check fo r proper air gap.
C orrect if necessary.
(.0 2 2 .0 5 7 )
Check and corre ct
b elt tension.
R E F R IG E R A T IO N C H A R G E
IS D E P L E T E D .
S Y S T EM HAS SOME
R E F R IG E R A N T .
If coil is s till in operative,
replace com pressor co il.
If previous step does not
correct clu tc h slippage,
repair compressor.
A d d one pound
refrigerant.
Leak test com ple te
system before
rem oving compressor.
Repair compressor.
Operate and leak
test system.
COMPRESSOR
TH RO W S O IL .
Blow out seal cavity
w ith air hose and
leak test.
L E A K S F R E O N .
Repair compressor.
DOES NOT
L
Wipe o ff o il - O .K.
Fig. 99-Compressor Diagnosis
1A
-8
0
H
E
AT
ER
A
N
D
AIR
C
O
N
D
IT
IO
N
IN
G