Check for any vacuum lines that may have come loose. Near the fire wall or under the dash. They control the climate diverters. There may be a valve going to the heater core thats shut.
It might be your heater coil or the water pump.
On most cars (all that I know of) the heater works by directing the hot water from the engine through a small radiator in the cabin and blowing air across it with a fan. If you hear and feel the fan blowing air then it could be that the valve that diverts the hot water to the small radiator is bad and no hot water is being circulated thus no warm air. In order to fix that you would have to locate the valve and replace it- many times they are in hard to reach places.
hope this helps
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