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The temp. gauge on my 79 F-350 w/400 is reading to the high end of the normal scale when fully warmed. I checked the coolant temp at 165 degrees,changed sending unit twice(once it was broken, second because of gauge reading) and I even changed the instrument cluster and still get same reading. Any ideas?
Dennis is correct use the recommended 195 stat or 180 minimum. Do any of your other gages read high? If they do you may have a bad instrument panel volatage regulator.
Is your temp. gauge reading between { NORMAL } pick a letter, or higher ? how hot is it out side , Is it reading high on the freeway ? or stop and go ( city) TNTsF-250 good luck.
The engine should run around 210-215 with the proper mix of water/coolant.
I'm sitting at 190-200* now. Is that too cool? I was getting 215-220* but was worried that it was a little high. Think my T-stat is 190* but I added a second fan to keep the temp down. Of course it's been too cold to predict what will happen in summer temps.