JAMAS, put on the white hat 'cause you're the hero! That was exactly the problem. I think it has also fixed another intermittent problem I've had with the blower motor. Sometimes, the blower wouldn't work, but if I switched between outside & inside vent, it would start working. So far, it blows every time now. It was a bugger to get to, I am 6" & 235 lbs & don't contort as well as I used to. Kudos to all...thanks, Robert