GMC 1976 ZEO 6083 Maintenance Manual page 124

COMPONENT REPLACEMENT
CONTROL ASSEMBLY
Procedures for the replacement of the heating
system control assembly is the same as models
equipped with air conditioning . See "Control Assem
bly Replacement" under air conditioning portion of
this section .
BLOWER COMPONENTS
Replacement procedures for the blower motor,
blower relay, and blower resister are the same as
described in the air conditioning portion of this sec-
tion .
AIR CONDITIONING SYSTEM 1-107
HEATER CORE
Replacement procedures for the heater core is the
same as for models equipped with air conditioning
See "Evaporator and Heater Core Replacement" in
air conditioning portion of this section.
VACUUM CONTROLS
Before replacing any vacuum control compo-
nents check system for proper operation. Controls
are the same as air conditioned models, except for the
deletion of the water valve and "Outside Air-Recirc .
Air mode". Lines to these components are simply
plugged. For details see vacuum control charts and
Figure 110 in air conditioning portion of this section .