Alright im having heating problems with my truck the heater is only working on high and it did this out of the blue i don't know when it extally started its not my ever day driver but it works and it only works on high still troughs out it any ideas what it could be

 

Check out your blower motor resistor. I am guessing you have an 01 or up.

 

hijack, mines doing the same thing. wheres the resistor?

 

under the passengers side of the dash.

 

could it be the trap or whatever getting stuck haha i really forget the name for it my friend told me to check it mine doesn't blow very well out the sides and i was gonna check that out for mine maybe it could be something like that

 

i believe the term you were looking for was blend door.

 

haha yes and isn't there something else too? it starts with a d