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Thermostat? Perhaps your old one is missing, or failed to the open position?
If you have a stock, or aftermarket, temperature guage on your dash, is it reading a good warm temperature while your heater core continues to blow cooler air?
It really is best to know what the rest of the coolant is doing elsewhere to diagnose this problem.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.