Your measurements are well within the proper operating change, on paper. the sending unit is a separate piece in the line between the stepper motor and sensor that basically captures and transfers the engine information To your gauges (stepper motors). The stepper motors should be alright should be, but i have seen many go out around 160-180k miles in the form of cluster failure. This is primarily why I'm worried, because I wouldnt think swapping a part would change the trucks behavior, but the cooling system is something im not knowledgeable in yet, so thats why I came here, to know if that change in behavior was something to be concerned with, or 197 is going to be the new average operating temperature, even though the only thing I replaced was the radiator The truck did not used to have this happen, it would stay consistently at 187 no matter what, and almost never went past 200. When I idle, the truck goes up to about 207 and thats when the fans kick in and drop temps to the high 180s, where it steadily creeps up to 197 and stays there. My fans seem to be running okay, but yes, that is happening that the engine cools more as I drive. I suspected there was air in the system, so I did my best to bleed it and it feels like it helped, but the truck isn't acting as it did before. Honestly, I did not check other connections other then to ensure there were no leakages, which there weren't. Is the Sending Unit the same thing as the gauge's stepper motor? Should I be worried? What can I do to get it back to its usual temps, or what could be causing the increased average? I was happy with it, and even when idling for long periods of time, the truck would never go over 200, always 197 max. Prior to the burst, the truck was very constant in its cooling. I live in AZ and I want to be prepped for the summer heat, and if the truck is going as high as 216 on winter nights, im not too sure what to think of it. Is this normal operating temps? Should I be worried? At that point I started driving and it cooled off, went back to 197ish. I left it idling in open air, and it went up to 216. Something I noticed however, is once I replaced the radiator, the average operating temp is around 197, and it doesn't take much for the truck to go up to 205. Im worried it caused damage, but I replaced the radiator, topped off the coolant and seems to be running fine. My scangauge read it got up to 225, where I pulled over, and let it cool down a little and continued on home. So about 3 or 4 weeks ago my radiator burst right under the upper radiator hose, dropped a lot of coolant, but thankfully made it home.
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