Chevrolet 1977 light duty truck Service Manual page 42

2. Remove the two resistor m ounting screws and
remove the resistor.
G eneral D e s c r ip tio n ........................................................................ 1A-14
C o n tr o l............................................................................................... 1A-15
D ia g n o sis .............................................................................................
On Vehicle Se rv ice .......................................................................... 1A-15
S pecifications...................................................................................... 1 A - 18
A n auxiliary heater is available as a dealer installed
accessory to provide additional heating capacity for the
rearmost extremities o f the C-K (06) and G (05 and 06)
models.
This unit operates entirely independent o f the
standard heater and is regulated through its own controls
at the instrum ent panel.
This system consists o f a separate core and fan unit
mounted as shown in Figures 1A-16 and 1A-17.
EXISTING HEATER
WATER VALVE
AUXILIARY HEATER
INDEX
GENERAL DESCRIPTION
CONTROL SWITCH
Fig. 1A-16--Auxiliary Heater Installations (C-K Models)
3. To install a new resistor, reverse Steps 1 and 2
above.
1 A - 15
Heater hoses extend from the unit to the front of
the vehicle w here they are connected to the standard
heater hoses with "tees". An "on-off" w ater valve is
installed in the heater core inlet line in the engine
compartm ent. This valve must be operated manually-
-"o n " for cold weather, "off" in warm weather. The
purpose o f the valve is to cut off coolant flow to the
AUXILIARY HEATER