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Thermostat ?
My temp gauge is fluctuating from 190 down to about 150. It doesn't matter if it is city driving or on the highway. I was ready to put a new tstat in, but I did a search and found that this has been a common problem. Does Cummins have a better tstat to replace this with? If so, can someone please give me the part# so that I don't have to do this twice. Even if this is "normal", I still want to stop it. It just ain't right.
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