Heater not working

What is your question?

heater doesnt switch to different levels it just comes out all over that has been a problem since I got it and dont know what to do about it ALso we changed the resistor becasue it only worked on the high setting after I changed it it works on all the lower settings but it doesnt work on high all the time. Also changed the blower motor So now the heater won't even come on. don't know what else can go wrong with it... it has been a pain in the a**.