I've been looking at the forums for a while now. I found some threads that are related to my concern. But not the same. I have a 93 sc300, awhile ago my heater would only blow cold, I know about the water valve going bad, but just the other day I drove my car to work, heater working just fine blowing hot, I goto my car to go home and my heater just stop blowing I can feel my blower motor going when I turn my heater on full and stops when I shut it off, it does blow hot and cold. Please help