a overheating detecting/shutdown device would be good, until it failed. (maybe have a few and on different circuits). ..... .... ... dealer is taking you for a ride and they obviously think you know nothing about cars and they obviously don't know much either. a water pump is less than $80. installation could not cost $400+. (i hope a dealer wouldn't need 5 hours just to install a water pump, which i heard is easier to install on a duratec than a zetec.) stop going to the dealer is my advice. find a reputable mechanic, and go in acting/talking like you know about cars, and about what you need.
