S-SERIES AIR CONDITIONING - HEATER SYSTEMControl Unit, Switch and CablesMajor functions of the heater systems are controlled fromthe control unit assembly (Figure 13). The control panelhas two levers and a blower switch.The HTR lever operates the hot water flow control valveand the blend door to regulate cab heating. The lower(AIR CONTROL) lever divides air flow betweenDEFROST and CAB AIR outlets.Separate controls (not in the control unit) are providedfor operating the fresh air ventilation system and thedriver floor heat dumps.The blower switch is a four-position switch to control theblower motor to OFF, L, M, or H.The ventilation system is controlled by rotating the VENTknob located to the left of the center instrument panel airoutlets. The driver floor heat dump is cable operatedfrom a push-pull control located at the upper left handcorner of the instrument panel.CTS-4066APage 8
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