new thermo flushed system sill just have warm air from heater

wow just browsing thru here and had a flshback of our 1997 f250 work truck, this was my shop last winter, we flushed, and all other sorts of things, well any how it ended up being the heater coar under the dash, this is behind the glove box, kinda a pain to get to if you have big hands, but doable. after we replaced it it blu hot air like a champ. after removing the old one we sawed it in half and just about every port was pluged, a lil heads up when you buy it look for the one with movable inlet and out let, the first one we ordered would not fit, napa had one that they moved on and this made it easy to install unlike the old one that had to be twisted and tweeked just to get out. hope this helps and best of luck.