Changing the heater core requires complete removal of the dash panel and plenum box. To do this you have to remove the steering wheel, steering column, evacuate and recharge the refrigerant system and drain the radiator. I would only consider changing the heater core if it is physically leaking into the passenger compartment. If the problem is heat transfer to the HVAC system only, the problem is more likely with the blend doors. Check heatertreater.net for pictures and diagnostic information.
The heater core is inside the hvac housing behind the dash.
The heater core is inside the hvac housing under the dash.
The heater core may be plugged or bad. You can either flush the heater core and the 2 lines running thru the firewall to the heater core or you can replace the heater core.
the heater core, heater core hoses or heater control valve is leaking
Stuck open thermostat. Plugged up heater core. Temp blend door malfunction.
The heater core has no gasket. If it is leaking, it must be replaced.
1. Is coolant flowing through the heater hoses and heater core? Once the care is fully warmed up, running, and the heater on, the hoses going to and from the heater core should be hot to the touch. If not, coolant may not be flowing. 2. Is the heater door, under where people's feet are, broken? This URL may help explain http://www.heatertreater.net/jeep Cherokee 97-04.html
If you look in the engine compartment , at the firewall , you will see where the ( 2 ) heater hoses run up to the firewall and connect to the heater core which is INSIDE the vehicle ( on the right side / passenger side )
If it is leaking inside the car, the heater core has failed.If it is leaking inside the car, the heater core has failed.
in the heater box behind the dash on the passenger side (right side) the dash has to come out and the ac must be evacuated to remove this heater core if you have never done it it is not a quick job i have done many of these and it takes several hours be sure the heater core must be removed to fix your problem befor starting
The heater core is leaking. GEt a manual from DISCOUNTAUTOREPAIRMANUALS.COM and replace it.
Blend door probably broke inside the HVAC box.