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Q:

no heat on 1998 Dodge Durango

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
inside cabin will not warm up, hear vents opening, blower blowing, motor running, just enough warmth to clear snow/ice from window after 15-20 minutes of running
(1) Answer
I would start with replacing your thermostat and coolant. Inspect all of your cooling system hoses and replace if Soft or swelling, hard or brittle. You can remove both heater hoses from the heater core and run water through it with a garden hose to make sure the heater core is not plugged up.