For the past 2 weeks, the light for the two knobs that control airflow and temperature has been going off and on intermittently. Then, one night last week, the heat just stopped working altogther. When my speed is up, I can still feel the heat, so it's not the temperature, it's the lack of airflow that is my problem. When the engine runs, neither of the fans do. I don't believe my blower motor is kicking on either, but I'm not sure. I checked the fuses for the heating unit, but it's fine. Could it be a fuse for the fans? A relay for the blower motor? Or the blower motor itself? I need a lot of help on this one. Thanks!