replaced core but now....

replaced the heater core and evaporator and got everything installed. actually went pretty well. some say it is a pia job but i found it to be not so bad. my problem now is that it just blows cold air. cant get any heat out of it. is it my blend door? if so how do i resolve this issue? did i hook something up wrong or leave something off?

pictures help if you have any.

thanks

Recheck all the vacuum line connections. If the blend door did not get correctly lined up with the pivot points in the upper and lower housings, it will bind up and not function.

Did you hook the vacuum line to the heater valve? I'm sure that's your issue.