Thanks for the input. I just took the truck to the dealer last night and I gave them a print out of all that you and the other have said. It was interesting to hear them say "wow, we didn't think about the heating element, you've really done your homework". I'm very courious to see what happens. They are going to look into the heating element itself. The dealer said it does NOT create a code when it goes out. I'll let you know what happens. I'm very hopeful. It would be nice to be able to trust the darn thing again. Our tempuratures here in Utah have been down around 10 to 15 degrees F during the night.