Start with the basics. I assume the fan blows OK at different speeds. I assume you can control if it blows at the floor, vent, or defrost levels.
Next, check your radiator coolant level. If your coolant is low, the car may not overheat (yet), but you won't get enough hot water in the heater core.
Heater directional flaps motors vacuum or motorized stuck
heater tap switch not moving
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