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Q:

heater blows cold air what can I check so it will work

on 1997 Ford Expedition

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I checked the vac. hose and its fine
(1) Answer
This is a blend door problem. This is above your ability. Seek out a repair shop for repair.