Heater not working please help me fix it?

I replaced my t-stat and fan clutch and I still have no heat what should I do?

Ac works fine, but heater won't blow warm.25 amp fuse is not blown, inside cab?

Thank you Wrench tech for the timely response. I checked the 2 hoses as you indicated, and it was recognized that one, the outlet of the motor, was indeed as hot as the coolant, but I never was able to get the return hose to rise to the equal temp? I suppose that there's a switch valve that is not working or whenever the hose blew, and was changed before I bought the truck, has possibly clogged the core?(I did have to change the thermostat due to improper reading, and found parts of the old hose fitting logged in the thermostat.) I could find it possible that maybe some of the same metal crumbs could have made it downstream to foul the switch valve?

My husband put a heater in, it will not heat up but the heater is working. Replaced thermostat truck is full of antifreeze. No leaks. Was wondering what would cause this.

He put in a new heater. He did not bleed it.

The heating is not working. We had changed both the heating core also put a 204 thermostat in thinking that was the problem. But had no luck with that. What could be the problem?

I have a 1992 silverado k1500 305. I have no heat. Replaced water pump, thermostat, and rad, flushed heater core 4 times still no heat. Help!

I have changed thermostat and flushed heater core. When motor is hot the heater box is hot but no hot air blows in. Fans blow fine but just room temp air. Any suggestions would be helpful.

I have checked as the truck warms up, one hose first warms up then the other as the water goes through the core. The blend door operates to change from defrost, windshield, to the floor, heater, but with no heat. Is the blend door also the directional door? How to fix and gain access, even if I can get the door (baffle) to open manually to let the air to blow into the heater core, if that is the problem?

I have replaced the radiator heater core thermostat and temperature blend door actuator and water pump in the past year. I have no heat and cannot figure out why. Could it be the climate control box? I do not think it is because the display works and I can hear it moving the doors back and forth when I press the button. I cannot think of another part in the heating system! Any help would be much appreciated! Also a few weeks ago the heat was so hot it would run you out, then all of a sudden it just stopped working.