When idle and running heater, blows cold air, upon accelerating blows hot air.?? on 2005 Hyundai Sonata

When I run the car idle in cold weather the heater blows cold air, even when Engine temp is up to normal. When I accelerate or run at speed the heater blows hot air. When stopped at a light it begins blowing cold air again. Was told it was the heater core which is a very spendy repair. Could it be anything else causing this.?

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