| feel comfortable doing the TB bypass. I studied the system the best I could and read everything in Search. IMHO, most peeps don't understand the function of the TB water lines to begin with. They have nothing to do with air intake temps at the plenum. The main function is to heat the throttle body butterfly pivot points by direct heat CONDUCTION through the metal sleeves circled in blue. These metal sleeves are built into the TB's and represent the furthest point of travel for the circulating water in the TB system. The entire system exists to get the heated water to these spots underneath the plenum. 
Radiant heat is not a factor. Heat by conduction from the areas circled in blue prevents icing of the butterfly pivot points when cruising at highway speeds at steady throttle. There aren't any performance issues. Even the icing risk is more of a legal-liability issue than a true safety risk. Imagine the Nissan engineers knowing that there was a risk of icing, however remote, and they did nothing about it. I know of ONE real-world case where the TB bypass lead to some icing at the butterfly pivot points. This occurred at below freezing temps, at highway speeds, on level terrain, with the cruise control set. The sticking throttle was instantly relieved by a judicious tap on the gas pedal. If there are other cases out there, please post them as I have asking for them for quite some time. As always, contrasting opinions welcomed, too.
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Nebraska can get pretty cold, but I would still - 
