Buy a kit at Wal-Mart or auto parts comes with adaptors, fittings, and instructions
The heater core is inside the hvac housing behind the dash.
The heater core is inside the hvac housing under the dash.
It would be best to disconnect the coolant lines and flush the core after the radiator flush. This will clear any sediment from the core.
I also have a 2000 jeep wrangler. This year has a problem with the heater core plugging up. You can either try to flush it out, or just replace the heater core.
You have to remove the dash and HVAC housing to access the heater core. how would i do that
Do you live in an area that you need your heater?
Prestone makes a good inline flush kit which is available at WallyWorld. You can also just disconnect the two heater hoses and patch a water hose to one and blow water out of the other, then reverse.
The two hoses that run thru the firewall into the heater core should both be hot. Check them with your hand; you may need to flush/replace your heater core. I hope this helps you. Mark