Q: what can cause heat not to work? on 2005 Kia Sedona

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
My van has a separate heater control for the rear of the van, which works fine. The front however, blows out cold air at all speeds. I checked my fuses and they all appear to be fine, what else may cause this problem?
(1) Answer
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