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My heater is blowing cold air..

678 Views 1 Reply 2 Participants Last post by  Goneracin
I have a 99 7.3l. My heater stopped working, the fan works but it will only blow cold air. Can you help me out, I live in NY and its starting to get cold! Good timing for the heater to take a sh!* Thanks for any replies.
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Any recent work done to the cooling system? Air bubble possibly? Are the heater core hoses hot? Maybe its a stuck vent. Vacuum pump working? Just kinda throwing ideas out here.
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