Sounds like your heater core is glogged. You'll have 2 hoses leading into the firewall and back to engine. Both should be hot on a hot engine. If not, it's clogged, but it's an easy fix I've done myself. On the hot side, remove it from the engine, set aside and mark where it goes. Remove the other hose (not hot) from engine, set in a liter bottle or bucket. On the hot side you already removed and set aside, hook a garden hose in there and blow the gunk out into the liter bottle. When it runs clear, hook back up, good to go.
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