Slant 6 NO Heat?

checked everything, just real slightly warm air comes out!

It could also be plugged another way......

Leaves, pine needles, mouse nest etc. inside the heater housing not allowing air to pass through it efficiently.

My heater core section was full of leaves and crap causing no heat.
Glad someone mentioned it.

Both hoses hot means it's circulating, but I wouldn't hesitate to flush the core backwards anyway.