Nissan Titan Heater Not Working

The Heater Core Heats As It Should Both Pipes Are Hot. I Have Changed The Blend Door On The Heater Box. I Have Checked The Water In Radiator...

All Systems Work, A/c, Defrost, Main Vents, Floor Vents. Problem Is, No Heat. I Have Checked The Function Of All Engine Bay Heating...

It First Started A Few Months Ago My Blower Actuator Made The Clicking Noise So I Took It Into The Shop And They Replaced My Blower Actuator...

No Heat, Cooling Is Fine, No Leaks On Passenger Side. I Changed Out Thermostat Both Lines To Heater Core Is Hot So What Is Wrong? Please...