what am i missing

check your actuators they control where the air goes. i'll send along a generic picture. if it 's vacuum controlled it may not be getting vacuum if it's electric maybe no power or it can be stuck

When was the last time you had your evaporator cleaned? If its been long ago, its possible that the evaporator is clogged by dirt/dust/etc.

If the fresh air vent had been sealed, ensure the fresh/recirculating flap is in the recirculating position.

actuators control where the air air goes, but thats the problem im not getting any air. blower motor works fine, pushes air to a/c compartment, but does not flow through to brand new heater core and doors to send air other places. I took an air compressor and blew out the evaporator and cleaned compartment but still air wont pass through. I have not seen or found any doors, actuators or any thing to change direction of air. It must pass through evaporator (a\c) then to heater core. NO AIR FLOW IS GETTING TO HEATER CORE.

I have seen fresh air intake being sealed to prevent outside air from getting to the interior. Turning the vent to fresh air would cause a vacuum in the blower unit and there would be no air blowing out of blower as the recirculating vent is also closed.

says here you have a mode control motor or duct work that has malfunctioned. check fuse 17, if not you'll have to chase wires to get the mode to work. if it worked before and heater core was replaced a wire has been pinched or damaged.

fuse 17 is good, mode control motor works,wires not pinched getting power to everything.fresh air and recirculating vents are not stuck. in the blower motor compartment with fresh air vent open, blower motor pushes air, a fair amount of air, it is directed to next compartment(a\c compartment) there is nowhere else to go this is factory designed to flow to this compartment with no actuators or vents to control. which is fine , air floes steadily to a\c compartment but wont flow through to heater core compartment(this is where the actuators and flow control are located-meaning floor, defrost you know all the settings) somehow the AIR FLOW must go from the blower compartment to the a\c compartment to the heater core compartment. but it wont. only thing blocking the air is a\c evaporator. i cant move it, there is no restriction, air should flow right through it and pass to the heater core but it wont. at this point i am open to any and all thoughts and ideas.

the only other problem i can think of when the heater was replaced the mode door was stuck on backwards blocking the air flow and now can't move or the shaft broke onteh mode motor so the motor works but won't move thedoor.

When air flow reaches the heater compartment, it must be directed to some place no matter what position the blend or mode doors are in. Where are the air flow directed to now?

Try running the blower at speed 3 or 4,listen where the rush of air is coming from.If there is a partial obstruction, it will make noise. How bad was the evaporator? Did you removed the coils during cleaning, or just flushed air on where it is? If there are a lot of dirt that you can see outside the fins, there are probably more in between the fins and coils. Blowing air might get rid of those outside, but those deep inside is pretty hard to remove. You have to dip it in a chemical solution to get rid of the dirt and grime.