[Stocker]

It's starting to sound like a plugged heater core BUT if it's plugged, coolant wouldn't flow. Since both heater hoses are hot, coolant must be flowing through them. The hoses should get too hot to comfortably touch for the heater to work well. If they're not hot enough you may have a bad (or wrong, or missing) thermostat, or restricted flow (possibly caused by a partially plugged heater core).