I've replaced the blower motor and the blower motor resistor but still have a check engine light and occasionally it will go out. Also occasionally the blower motor may work on when I'm calling for heat but never when I'm calling for AC. The OBD code from the auto parts store are always the same saying there's probably something wrong with the blower motor circuit. Possibly loose or corroded connections? What else could be the problem? Does anyone have good knowledge how to check things so I can possibly find the problem? South Carolina in the summertime is hell. Two more payments on this piece of junk will give me some relief financially but I'm tired of dumping money into this. I know how to use a multimeter. Please, anyone have any good knowledge where I can start? Thank you.