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Q:

No heat on 1998 Ford F-150

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
there is no heat in the truck. we replaced the thermostat and the antifreeze.
(1) Answer
Check both hoses going into the fire wall and see if they are both hot, if not heater core needs flushed or replacement. If both are hot you have a hvac contol issue, possible bad door actuator.