Compressor Diagnosis - Chevrolet 1980 Light Duty Truck Service Manual

C L U T C H S L IP P IN G .
COMPRESSOR EN G AG ED
BU T NO T O P E R A T IO N A L.
B E L T S L IP P IN G .
H IG H T O R Q U E C O M P R E S S O R .
COMPRESSOR
THROW S O IL.
N O IS Y O N L Y W H E N
C L U T C H IS E N G A G E D .
COMPRESSOR
NO ISY.
N O T E : A /C system noise is to
be evaluated in the N O IS Y W H E N C L U T C H
vehicle w ith doors and
IS N O T E N G A G E D .
w indow s closed and low
blow er on.
COMPRESSOR DI AGNOSIS
Check fo r proper air gap.
Correct if necessary.
(.022.057)
Check and correct
belt 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 E IZ E D )
S Y S T E M HA S SO M E
R E F R IG E R A N T .
LEAKS R EFR IG ER AN T.
Blow out seal cavity
w ith air hose and
leak test.
DOES NOT LEAK
Check fo r refrigerant
lines touching metal
parts. Isolate and
re-evaluate noise.
Remove compressor belt
to determ ine if noise
s till persists.
If previous step does not
correct clutch slippage,
repair compressor.
Add one pound
refrigerant.
Leak test com plete Repair compressor.
system before Operate and leak
rem oving compressor. test system.
Repair compressor.
Wipe o ff oil - O.K.
Repair compressor
Check and adjust
if noise is
belt tension.
objectionable.
If interference
Check fo r interference
exists, repair
between co il housing
compressor.
and pu lley hub.