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Home >> GMC >> 1996 >> Suburban C2500, 7.4 J >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heater System >> Operation >> Operating Modes >> DEF Mode

DEF Mode

Air is directed to windshield defroster outlets. A slight amount of air is diverted to floor outlets and side window defogger outlets.