Chevrolet 10 Series 1970, Service Manual

Page: 58 / 671

HEATER AND AIR CONDITIONING 1A-28
3. Cut out the leaking portion o f the hose, making sure
that a ll o f the fa ile d portion is rem oved. If only a
v e r y sm all portion o f the hose was rem oved, it may
be p ossib le to sp lice the two ends togeth er using a
sp ecial hose connector and two hose clam ps. If
s e v e ra l inches o f hose must be rem oved, a new piece
of hose should be sp liced in using two connectors and
four hose clam ps. Dip the ends of the hoses in clean
re fr ig e r a tio n o il b efo re in stalling the hoses onto the
connector. N e v e r push the end o f the hose beyond
the locating bead o f the connector. Torque the clamp
to 35-42 in. lbs.
C A UTIO N: Be sure to rep la ce the hose in the
body in the sam e manner as when rem oved. If
the hose p ro te c tiv e g rom m ets a re badly muti­
lated, they should be replaced.
4. Evacuate, charge and check the system .
G M Chevrolet System
Th is system makes use o f individual hoses, attached at
eith er end by hose clam ps. In case of a fa ile d hose, the
en tire hose should be replaced.
COMPRESSOR
Removal (Fig. 3 5 )
1. Pu rge the r e frig e ra n t fr o m the system .
2. Rem ove connector attaching bolt and connector. Seal
connector outlets.
3. D isconnect e le c tr ic a l lead to clutch actuating coil.
4. Loosen b race and p ivot bolts and detach belt.
5. Rem ove the nuts and bolts attaching the co m p ressor
brackets to the mounting bracket.
6. B efo re beginning any co m p resso r disassem bly, drain
and m easure o il in the co m p ressor. Check fo r
evidence o f contamination to determ ine if rem ain der
o f system req u ires serv ic in g .
C om p ressor s e r v ic ­
ing inform ation is located in the Chassis Overhaul
Manual.
Installation
1. If o il p revio u sly drained fro m the com p resso r upon
rem o va l shows no evidence o f contamination, rep lace
a lik e amount o f fre s h r e frig e ra tio n o il into the com ­
p re s s o r b efore rein stallation . If it was n ecessary
to s e rv ic e the en tire system because of e x c essive
contamination in the o il rem oved, in stall a full
charge o f fre s h re fr ig e r a tio n o il in the com p ressor.
2. P osition com p resso r on the mounting bracket and
in stall a ll nuts, bolts and lock w ashers.
3. Install the connector assem bly to the co m p ressor
re a r head, using new "O " rings coated with clean
re frig e ra tio n o il.
4. Connect the e le c tr ic a l lead to the c o il and in stall
and adjust co m p resso r belt.
5. Evacuate and charge the system .
6. Leak test the system and check fo r p rop er operation.
Compressor Belt Tension Adjustm ent
Adjust the com p ressor belt to the sp ecification s shown
in the Tune-Up chart in the Engine Specification section
o f this manual.
F ig . 3 6 —C ondenser and R e c e iv e r-D e h y d ra fo r
CONDENSER (Fig. 3 6 )
1 0 -3 0 Series
Removal
1. Pu rge the system of re frig e ra n t.
2. Disconnect the re frig e ra n t lin es at the condenser and
cap them.
3. Rem ove the hood catch assem bly. R em ove low er
shroud mounting screw s.
4. R em ove radiator mounting bolts and push top o f ra d i­
ator back enough to make lo w er condenser mounting
nuts a ccessib le by reaching down between radiator
and radiator support.
5. R em ove condenser attaching bolts and rem ove con­
denser (cap the condenser inlet and outlet if it is to
be reused).
Installation
1. L o w er the replacem ent condenser into position and
replace mounting bolts. Be certain shim s are in­
stalled at lo w e r condenser mount bolts.
CHEVROLET TRUCK SERVICE MANUAL
4 0 - 6 0 SERIES