My cars defrost in front aren't working. I have a 1996 Honda accord.
Could be a problem with the mode select switch, or a problem with the air delivery mode door, something is keeping it from opening to that position. I assume you have heat and that the blower motor works and that air is coming out from the other vents?
If you have air coming out at the windshield then your AC may not be working. Defrost requires the AC to condense the moisture ...even in the winter
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