1998 Dodge Intrepid poor heat

i have changed the thermostat. I bled the the system and no air is coming out of the bleed valve. the hoses to the heater core are hot on the inlet and return. when i turn the knob to go from defrost to the right and other funtions to the left the air blows out of the proper vents. I do not get the heat to get hot or the a/c get cold out of any of the vents. The only thing I have not checked is if the blend door is working. I do not have a good manual to even see where it is, if there is more than one, if there are sensors that can be checked. I am stumped at this point. I could use any advice on what it could be and directions and even pictures and diagrams in showing how to fix the problem.