What is wrong with my 2004 chrysler concorde climate system?/

you may have a couple of things going on here.first,when you have high speed only,most of the time the blower motor resistor is burnt,and the blower motor will default to the defrost mode and will need replacing.second,when the blower only blows out of the defrost,usually it's a vacuum leak either under the hood or under the dash at or near the controls.pull the resistor first,see if it's burnt.check the connector also for being melted.