Component Replacement And Repairs; Blower Motor; Heater Core Case And Core; C O N Tro - Chevrolet CHEVY VAN G10 SERIES Service Manual

HEATER 1A-2
The h eater operates on " outside air" only, w ith the blower
receiving its airflow from the cow l vent plenum cham ber.
Engine coolant flows through th e heater core w henever the
engine is running. H eater o u tp u t is controlled by varying the
am ount and tem perature o f the air entering the passenger
co m partm ent. A dash m o u n ted , three lever control system is
u s e d t o p o s i t i o n th e
" TEM PERA TU RE" doors and to actuate the three speed
blow er switch.

COMPONENT REPLACEMENT AND REPAIRS

BLOWER MOTOR (Fig. 3)
Replacement
1. D isconnect the b attery cables and remove the b attery .
2. D isconnect the blow er m o to r lead wire.
3. Remove the five blow er m o to r to dash screws and
remove the m otor and wheel assembly. Pry gently on the
blow er flange if the sealer acts as an adhesive.
4. Remove the blow er wheel to m o to r shaft nu t and
separate the wheel and m o to r assemblies.
5. To install a new m otor, reverse Steps 1-4,
N O T E : The follow ing precautions should be taken
to assure proper installation:
a. Assemble the blow er w heel to the m o to r w ith the
open end o f th e wheel away from the blower
m otor.
b. I f the m otor m ounting flange to dash sealer has
hardened, or is n o t in ta ct, remove the old sealer and
apply a new bead o f sealer to the entire circum ­
ference o f the m ounting flange.
c. Check blow er op eratio n ; blow er wheel should ro ­
tate freely w ith no interference.

HEATER CORE CASE AND CORE

Replacement (Fig. 4)
I . D isconnect th e battery ground cable.
" D E F R O S T " , " A IR " , and
CONTROLS
The controls are located in the in stru m en t panel, ju st to the
right o f the instrum ent cluster. In operation, three levers
co n tro l all heater operations (figs. 1 and 2).
HEAT Lever
When this lever is fully up, all incom ing air is diverted
around th e heater core. When fully dow n, all air is directed
through the core for m axim um heating. The lever may be
moved anyw here betw een to provide the desired o u tlet tem ­
perature by blending b o th h eated an d unh eated air.
A IR -FA N Lever
When this lever is fully up, no air passes through the
system . Moving the lever dow n approxim ately halfw ay, opens
the air d o o r in th e air distributor assembly. Moving the lever
the rest o f the way dow n actuates the three speed (LOW-
MED-HI) blow er switch.
DEFR Lever
When this lever is fully u p , all incom ing air is directed to
the floor outlets.
Moving the lever dow n, directs increasing am ounts o f air to
the defroster o u tlets until at the full dow n position, all o f the
air is directed to the defroster outlets.
2. Place a clean pan under the vehicle and then disconnect
the heater core inlet and outlet hoses at the core
connections (see "H eater Hoses—R eplacem ent" later in
this section). Quickly plug the heater hoses and support
them in a raised position. Allow the coolant in th e heater
core to drain in to the pan on th e floor.
3. D isconnect the right h and air distributor hose from the
heater case and rotate it up o ut o f the way.
C H E V Y V A N SH O P M A N U A L