System Components; To Operate Rear Air Conditioning Unit - Chevrolet CHEVY VAN G10 SERIES Service Manual

Move " A IR " lever (FR O N T) to "L " "M" or " H " position.
Turn " TEMP" knob tow ard WARM (C ounterclockw ise) to
satisfy your com fort requirem ent.

To Operate Rear Air Conditioning Unit:

O perate fro n t unit as above and move " A IR " lever (R E A R )
to " L" , "M" , or " H " position. Rear u n it will n o t operate
unless fro n t unit is operating.

SYSTEM COMPONENTS

Both units m ake use o f the same six cylinder reciprocating
com pressor o f 12.6 cu. in. displacem ent.
The com pressor is identical to th a t used for th e Four-
Season system on all other trucks. I t is m ounted to the engine
and driven by a belt from the crankshaft, using an idler pulley
for belt tension adjustm ent. The condenser is m ounted in
fro n t o f the engine cooling radiator and
d eh y d rator is m o u n ted on the right side o f th e condenser. The
receiver-dehydrator and condenser are .identical, w ith either
C-62 or C-62 & C-63 systems.
The evaporator and blow er assembly for th e C-62 system is
m ou n ted betw een the tw o fro n t seats under a "N O R Y L "
cover. This cover incorporates the con tro l panel for either the
C-62 or the C-62 and C-63 systems. The evaporator, expansion
valve, blow er m o to r, resistors, switches, and relay assemblies
are m ounted u n d ern eath th e cover. The fro n t d istrib u to r duct
is located betw een the blow er and evaporator assembly and
the engine cover. There are six outlets from th is duct
assem bly, tw o floor coolers and four u pper level m u lti­
directional coolers for the driver's side and passenger side o f
the fro n t seat area (Fig. 15).
The roof-m ounted system incorporates a blow er evaporator
u n it w hich is m o u n ted to the inner ro o f panel at the rear o f
the vehicle. On the Sportvan, an overhead central air distri­
b u to r duct, w hich contains adjustable o u tlets, extends forw ard
from th e blow er-evaporator u n it (Fig. 16).
The C-62 refrigerant lines are routed from the engine
co m partm ent along the right frame rail and then to the
evaporator u n it. When the C-63 system is added, refrigerant
lines " te e " into the C-62 lines at the evaporator and are th en
ro u ted across to the left frame rail, betw een the body inner
and ou ter body side panels, and th en up the left rear ro o f
the receive:r-
pillar (Fig. 18).
The rear system differs from the fro n t system in th a t
refrigerant flow is split betw een tw o expansion valves and
follows separate piping through the evaporator core before
flowing back in to one line after leaving the c o re .
A IR C O N D ITIO N IN G 1A-11
C H E V Y V A N SH O P M A N U A L