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Q:

heater not functioning on 1997 Ford Explorer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
front blower does not operate
fuses ok what might the problem be
(1) Answer
Does the blower work on the high setting? If so, it's possible the blower resister pack or blower speed control has gone bad (depends on your style of heater system). If no speeds work, it could be the control panel but you'll want to confirm that with some voltage checks.
They have a free repair guide here that might come in handy
http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528018eeea