Hi folks,

I have a 2000 XJ Limited. I just had to replace my entire cooling system when I got it because someone had filled it with stop-leak. Car's running great and the temperature is perfect however, my heater is only luke warm. Of course it was flushed with the whole system before the new radiator and thermostat were installed but it needs more. I can't afford to replace it so I want to disconnect the hoses from the heater core and backflush it directly. Problem is, I don't know which hose is the inlet and which is the outlet from the core? Can someone help me with that?

 

Figure 1

1. Disconnect battery ground cable, then drain cooling system.
2. Disconnect hoses from heater core.
3. If equipped with A/C, remove evaporator/blower housing as follows:
   1. Discharge A/C system, then disconnect hoses from expansion valve.
   2. Disconnect electrical connector and vent tube from blower motor.
   3. Remove console, if equipped.
   4. Remove lower instrument panel attaching screws, then the lower panel.
   5. Disconnect electrical connections from A/C relay, blower motor resistors and A/C thermostat.
   6. Disconnect vacuum hose from vacuum motor.
   7. Cut evaporator/blower housing to heater core housing retaining strap, then disconnect heater control cable.
   8. Pry retaining clip from rear of blower housing flange, then remove the three retaining screws.
   9. Working from engine compartment, remove evaporator/blower housing attaching nuts, then the evaporator drain tube, Figure 1.
   10. Remove right kick panel, then the instrument panel support bolt.
   11. Pull right side of dash outward, then rotate housing downward and towards rear of vehicle until studs clear dash panel. Remove housing from vehicle.
4. Remove heater core to housing retaining screws, then the heater core, Figure 2.
5. Reverse procedure to install.

Figure 2