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its called a heater core. The hot engine water goes into the passenger compartment through the engine fire wall.
then it goes through the heater core and radiates out heat and the water returns into the engine.
They are hard to get to !
this you tube video shows how difficult it is to get to the heater core. https://youtu.be/3gs0NhxUnFA
If the heater hoses are getting hot to the core (check under the hood) then the problem is more than likely the air temperature controls blend door, it is either stuck or the tiny drive motor is defective, in most cases both are in need of replacement.
heater core is most likely the prob. its a long process to replace but can be done. replaced mine in my 99 ram 2500. remove steering column and entire dash to reveal heater core, passenger side floor area.
low coolant. disconnected or faulty servo to control difference between hot and cold or the heater core could be clogged. if it warms up when reving the engine then it is probably low coolant.
it sounds more like the thermostat, a thermostat will cost around 8 to 12 dollars,just remove the thermostat housing and replace the old thermostat then reinstall the housing
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