Chevrolet 1977 light duty truck Service Manual page 64

C O M P R E S S O R N O T E N G A G E D .
C O M P R E S S O R E N G A G E D
B U T N O T O P E R A T IO N A L .
C O M P R E S S O R
T H R O W S O IL .
C O M P R E S S O R
N O IS Y .
N O TE: A/C system noise is to
be evaluated in the
vehicle with doors and
windows closed and low
blower on.
CO M PR ESSO R DIAGNOSIS
Retrace electrical circuit back to source of power loss.
C-K-G MODELS:
NO V O L T A G E A T
Check for defective discharge Pressure Switch by jumping switch connector terminals.
C O M P R E S S O R C O IL.
operates, check for low refrigerant charge.
P R O P E R V O L T A G E C h eck f o r p ro p e r g ro u n d and
TO
g o o d c le an e le c tric a l c o n ta c t
C O M P R E S S O R C O IL.
at te rm in a ls .
C h eck f o r p ro p e r a ir gap.
C LU T C H S L IP P IN G .
C o rre c t if necessary.
B E L T S L IP P IN G .
C h eck a n d c o rre c t
b e lt te n s io n .
R E F R IG E R A T IO N
H IG H T O R Q U E C O M P R E S S O R .
IS D E P L E T E D .
(S E IZ E D )
S Y S T E M
R E F R IG E R A N T .
rl LEAKS REFRIGERANT.
8 lo w o u t seal c a v ity
w it h a ir hose and
le ak test.
DO ES
Check f o r re frig e ra n t
N O IS Y O N L Y W H E N
lin e s to u c h in g m e tal
C LU T C H IS E N G A G E D .
p a rts . Is o la te and
re -e va lu a te noise.
N O IS Y W H E N C LU T C H
R e m o v e c o m p re s s o r b e lt
IS NO T E N G A G E D .
to d e te rm in e if noise
s till persists.
If charge is satisfactory, switch is defective-replace.
I f c o il is s t ill in o p e ra tiv e ,
re p la ce c o m p re s s o r c o il.
I f p re v io u s ste p does n o t
c o rre c t c lu t c h slip p ag e ,
re p a ir c o m p re s s o r.
( . 0 2 2 . 0 5 7 )
A d d one p o u n d
C H A R G E
re frig e ra n t.
L e a k te s t c o m p le te
H A S SO M E
sy ste m b e fo re
re m o v in g c o m p re s s o r.
R e p a ir c o m p re s s o r.
N O T L E A K
W ip e o ff o il - O .K .
C h eck a n d a d iu s t
b e lt te n s io n .
C h eck f o r in te r fe re n c e
b e tw e e n c o il h o u s in g
a nd p u lle y h u b .
(See wiring diagrams).
If compressor
R e p a ir c o m p re s s o r.
O p e ra te a n d leak
te s t s y s te m .
R e p a ir c o m p re s s o r
if noise is
o b je c tio n a b le .
I f in te rfe re n c e
e x is ts , re p a ir
c o m p re s s o r.