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Antifreeze smelling white smoke or fog coming from the vents means you have a leak in the heater core or one of the connections to it. This will only get worse and needs to be repaired before you loose all your coolant. If it smells like burning leaves or grass then it is possible that leaves have found their way into the heater box. A lot of vehicles use a resistor block that is mounted in the heater box to provide resistance for the various blower speeds. When the blower fan is on low speed - then one of these resistors is in series with the blower. The resistor will become quite hot ( normal ) and since it is mounted in the heater box, the air flow will cool it. However if leaves or other foriegn material has found its way into the heater box - these can burn if they come in contact with the resistors. Usually it will happen once and the problem goes away. If it smells like plastic burning - then you may have a wiring issue.
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Why is black smoke coming through your dash vents in your 1994 dodge caravan?
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