TM 9-2320-365-10b. Heater/Defrost Controls. Figure 2-8 shows all heater/defrost controls on the centerconsole.Figure 2-8. Heater/Defrost Controls1. Fan Switch. Four-position switch used to control operation and speed of heaterfan.2. HEAT Control. Controls temperature of air that heats cab interior and defrostswindshield. Temperature of air increases when control is pulled.3. VENT Control. Controls flow of outside air to cab. When control is pulled, freshair is vented into cab.4. DEFR (Defrost) Control. Controls windshield defrosting. Air is routed from heaterto defrost windshield when control is pulled.2-15
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