We have the Cummins 400isl engine. Our temp was running 175 to 179 when we bought it used. Reading other post everyone said that it was ok. I called Freightliner in Gaffney and was told that is to cold. I asked a bought changing the thermostat and was told that it starts to open at 180 and full open at 187. After trouble shooting we found our direct fan control was running on high all the time. After we changed it, our temps now runs 195 to 199. That is with the outside temp at 95 degrees. Our mpg is now 8.3 from 7.9 and it seems we have better acceleration.
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2008 Thor, Four Winds Mandalay 40G. Cummins 400 isl. Freightliner chassis
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