1999 Ford Expedition heat blows cold. Cheap fix that was my problem

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Check your fuses. I drove without heat for 4 years in the front. Went to replace the blend door actuator and the old one worked after we tore apart the dash. I had a blown fuse. Go through your owners manual because there are several fuses that tie into the heating system. I had already had the radiator replaced, the heater core flushed and had several certified mechanics look at it. Hope this helps someone