The temp on the DIC goes much higher than 197, teens is nothing for winter really(try some New England - degrees). You should be running a good sized cooler stand alone . Coolant temps are a whole other issue, a flush and new thermostat is overdue if not already serviced(t stat is a royal pain). These transmissions are the weak link, and if your fluid is brownish you already know its an issue. Do some searching on this site as well as LS1TECH in the LS4 section, there are thousands of posts transmission related.Good luck