Have you checked the heater switch that is located under the hood, and is secured to the heater hose's. This switch will have two hoses connected on one side and two hose's connected on the other side, and is mounted on the side of the valve cover. There is a vacuum line connected at the top that controls the valve open and close function, allowing hot coolant to enter the heater core and provide heat to the interior. This is just one option I thought I would mention.
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