Quote:
Originally Posted by jtmarten
Finally had a reason to drive the beast after installing the 180* superstat. Temp now reads just over the first large hash mark (about 1/4) instead of at or just under the 210* mark. Hopefully no trans issues from now on.
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I humbly suggest that unless you are towing ALL the time, consider putting the higher temp stat back in.
Your ECM is likely designed to work with the 195 stat in order to produce the lowest emissions and get the best fuel economy.
It may interpret the lower coolant temp produced by the 180 degree temp as being too cool and may be richening the fuel mixture slightly trying to warm it up.
Therefore, the 180 stat may increase fuel consumption slightly, not only due to the richer mixture but also because a slightly warmer engine is more thermodynamically efficient.
Also, one of my auto service textbooks demonstrates that a 195 stat reduces engine wear over a 180 stat, because (up to a point) a warmer engine and engine oil experiences less wear.
Imo unless the engine actually boils over, a lower T-stat is not the best way to correct for an overheating trans. Get the biggest trans cooler that you can find. Also consider installing an electric transmission temp gauge. The sensor part screws into the trans in place of one of the fluid pressure test ports in the side of the trans.