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I have a 1986 GMC half ton and my defrost doesn't work very good it pushes most of the air through the dash front vents and not defrost but it still blows good hot air?
Wiki User
∙ 14y ago
sounds like the vent door that changes the air from defrost to heater is jamed its a little metel door like a flap.follow the cable from defroster switch and you should be at the door,its a manual door
Wiki User
∙ 14y ago
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