Q: Heat blows warm not hot

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The heat blows warm air but not hot. I assumed it was the heater core but after running the vehicle with the heat on I felt the inlet and outlet hoses to the heater core and both were hot. From my understanding this indicates that the heater core is functioning. I know my coolant system is in need of a flush but not sure if that is the only issue.

My car has 193000 miles.
My car has an automatic transmission.

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