Why Won't My Truck Heat Work?

I have a 1995 Ford Ranger 2.3 that has NO Heat. I have replaced the heater core, heater valve, thermostat, blend door & actuator, checked all vacuum hoses too. The engine seems to get warm, the indicator does not go up to normal, one hose to the core is cool. It's a nice truck except for this issue. Any clues?

Grit your teeth, and go to the dealer.

Heater core is plugged after 20 yrs of crud. One hose is cold should be a clue. Pull booth heater hoses, take a garden hose a flush the core. Or the heater control valve is not moving.

A low coolant level could also be the problem

UM brand new core as mention in my question & of course the antifreeze levels are normal. I guess I'll flush the radiator and replace the heater valve again?

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