It is inside the HVAC housing, which is behind the dash.
No.
NoNo
Remove the water supply hoses from your 2002 Dodge Ram 1500 heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
Yes
Drain the water from your Dodge Ram truck cooling system. Remove the water lines from the heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
pull the dash
can be water pump, radiator, heater core, thermostat housing, hose, or freeze-out plugs
have a professional do it
If the engine is getting up to normal temp, the heater core might be plugged. Heater core is not plugged and normal operating temp!
The heater hoses are 5/8 inch diameter.
If a Dodge Ram Van is not getting any heat, the first sign of it being the fault of the heater core would be a very wet passenger side floor board. The heater core is located near the foot well on the passenger side.