HEATER AND AIR CONDITIONING 1A-5
AU XILIAR Y HEATER INDEX Page General D escrip tio n .................................................................................... Controls .....................................................................................................
1A-5 1A-5
Page Component Replacement and R e p a ir s...................................................
1A-6
GENERAL DESCRIPTION An auxiliary heater is available as a dealer installed a ccesso ry to provide additional heating capacity for the re a rm o st ex trem ities of the panel and suburban models. This unit operates entirely independent of the standard h eater and is regulated through its own controls at the instrum ent panel. This system consists of a sep arate core and fan unit mounted either under the second seat or at the left side of the vehicle (Fig. 9). H eater hoses extend from the unit to the front of the vehicle where they are connected to the standard h eater hoses with “ tees” . An “ on-off” water valve is installed in the h eater core inlet line in the en gine com partm ent. This valve m ust be operated manually —“ on” for cold w eather, “ off” in warm w eather. The purpose of the valve is to cut off coolant flow to the auxiliary core during warm w eather and elim inate the radiant heat that would result.
CONTROLS Two methods of control are employed with this system :
Water Valve (Fig. 10) When heat is desired, the w ater valve m ust be in the “ on” position (valve located in the engine com partm ent in the core inlet line). During the sum m er 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 instrum ent cluster. Pulling the switch knob out half-way places the fan on “ HI” ; at the full out position, the fan is on “ LOW” .
Fig. 9 —A u x ilia ry Heater Installations
10-30 CHEVROLET TRUCK SERVICE MANUAL
