heat only blows on high setting on 2000 Dodge Stratus

when i first got car the heat worked all settings worked then the first setting stopped working and it started barely blowing air even when it is in off position now it only works if i have the setting up to high full blast same with the air conditioner now too can anyone help me at all.

Asked by for the 2000 Dodge Stratus
2 answers
It could be the blower resistor as stated in answer one but could also be the switch. Check if you are getting the correct voltage from switch to resistor with volt meter would be advised. If you would like us to look at it just call me and schedule an appointment (313-562-7022). I am sure we can figure it out for you.

blower resistor needs to be replaced.