Auxiliary Heater - Chevrolet 10 1971 Series Chassis Service Manual

General Description ................................................................................
Controls ................................................................................................
An auxiliary heater is available as a dealer installed
accessory to provide additional heating capacity for the
rearmost extremities of the panel and suburban models.
This unit operates entirely independent of the standard
heater and is regulated through its own controls at the
instrument panel.
This system consists of a separate core and fan unit
mounted either under the second seat or at the left side
of the vehicle (Fig. 9). Heater hoses extend from the unit
to the front of the vehicle where they are connected to the
standard heater hoses with " tees" . An " on-off" water
valve is installed in the heater core inlet line in the en­
gine compartment. This valve must be operated manually
— " on" for cold weather, " off" in warm weather. The
purpose of the valve is to cut off coolant flow to the
auxiliary core during warm weather and eliminate the
radiant heat that would result.

AUXILIARY HEATER

INDEX
Page
1A-5 Component Replacement and Repairs ................................................
1A-5
GENERAL DESCRIPTION
CONTROLS
Two methods of control are employed with this system:
Water Valve (Fig. 10)
When heat is desired, the water valve must be in the
" on" position (valve located in the engine compartment in
the core inlet line). During the summer months, this
valve should be placed in the " off" position.
Fan Switch (Fig. 11)
The two speed (HI-LOW) fan switch is located below
the left side of the instrument cluster. Pulling the switch
knob out half-way places the fan on " HP'; at the full out
position, the fan is on " LOW" .
HEATER AND AIR CONDITIONING 1A-5
10-30 CHEVROLET TRUCK SERVICE MANUAL
Page
1A-6