Blocked heater core. Remove the heater core lines and force a power washer back and forth in the heater lines and see if you can free the blockage. If you can't get a good water flow, you will have to replace it.
Might be a blend air door problem are the heater hoses the same temperature?
SOURCE: 91 4x4 Toyota Pickup Overheating
did you take out the thermostat?
If not do that if so it might be a feul mixture problem. To lean will make it run hot
SOURCE: 96 dodge dakota low heat from heater
Well sound slike you have covered most the things . I would try and remove the hoses from the heater core and back flush then with a garden hose sounds like the heater core might be pluged. Does it heat up more if you bring up the rpm's ?
SOURCE: 2002 jeep liberty has very
sounds like a head gasket problem. A minor leak there will pump compression into coolant and force it out of heater core. Any unusual steaming from tail pipe? Also: if radiator was flushed "in car" sometimes debris does not come out. Try flushing with it out of the vehicle. Jeep radiators are notoriously small for their application if not at at least 90% they will not work correctly.I'd look at the hg first though otherwise, your symptoms seem to be contradictory.
SOURCE: We have a 1999 Chrysler 300 M we have good ac
check valve at and before fire wall penetration should be in line with heater hose
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