99 dodge 2500 v10
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The temp gauge in mine just ain't that accurate.... In fact, it is SO inaccurate, I actually changed the thermostat, because I thought the engine was running too cold, only to find.... Temp was correct.... and I didn't need to change the stat. I figgered it out AFTER I had changed it, the gauge was in the same place, and my scanner told me the engine was at 195...... Shoulda done that FIRST.
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Somebody didn't put a Failsafe thermostat in it did they? Get a remote infrared thermometer and warm the engine up.Read the metal part on top of the thermostat.If it' reading cold, 120-130 is as much as they will warm up when failed, If the thermometer is reading 185 or more, it's not failed, you have an issue with your gauge.