I need some general information to help. First, is the engine reaching operating temperature and staying there? Are you sure the coolant level is full in both the radiator and overflow? Note: Only open the radiator when the engine is cold. Next, if the engine is warm, coolant is full and there is no heat, feel both heater core hoses under the hood. Under normal conditions, both should be hot. I found a picture online which shows the heater core hoses. They are the two approximately 5/8" hoses which run to the firewall. Check those things and let me know what you find.
Additionally, here is a video from the owner of this site discussing the top ten causes for heater problems. I recommend watching it.
https://www.youtube.com/watch?v=SNRb6pSwYuU
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Thursday, February 8th, 2018 AT 6:30 PM