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1. Your coolant level is low 2. Your thermostat doesn't close and needs to be replaced 3. The valve from the cooling system to the heater core is stuck 4. Your heater core is clogged
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Start with having the heater core flushed and also make sure the valve that allows coolant to flow through the heater core is opening and closing correctly when switching from heat to A/C. Please rate this answer, thanks.
I had a grand caravan that did the same, and it would not heat until I added the antifreeze. It sounds funny, but I hear, that the water turns to steam at the top, and does not circulate well without antifreeze/antiboil.
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