When I turn my front hearter on it blows cold air, what could the problem be?

What is your question?

The heater is on when I turn the controls to heat, it just blows out cold air, when in the heat mold.

What makes this problem better or worse?

It want get hot when.the van has.warm up

How long has your 2005 Kia Sedona had this problem?

It started Wednesday morning, March 14, 2018