Intertherm furnace not getting hot after motor...

Question

I have a mobile home that is equiped with an intertherm furnace motor ith a compatible motor from cc dickson in Gaffney, SC because the original was locked up. Now it blows MUCH harder but it won't warm up. I can restrict the air flow and get it somewhat warmer but the furnace runs non stop. It is a 3 speed to where my orginal motor was a one speed but I have it hooked to the red wire for the slowest speed possible. Can anyone help me please as I have 2 small kids that''s having to deal with this also. Thanks so much for the help. Brad