There is possibly air trapped in you heater core, or your heater control valve is stuck close. There could also be a clogg in the heater core. try applying vacuum to the cooling system to evacuate the trapped air. Also try disconnecting the heater outlet hose and starting the car. If fluid shoots out from the heater core there is no clog.
Two possible reasons, one is that your heat control valve that directs hot coolant to the heater core may be stuck or blocked. Two, you may have an airlock in the heater core that prevents water getting in to the heater core. You need to let the air out by loosening the upper most hose that feeds the heater core.
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