It maybe the air trap control or it maybe wiring had major body work done 6 months ago it worked fine and heater stopped working when radiator was fixed way before the body work was done like a year before the heater was flushed recently the heater worked for one day but the ac was still working til about a month ago....what do think it may be....
My ac stopped blowing all of a sudden when it was working fine. on 2001 GMC Jimmy
Blower motor resistor or fuse!!