N14 Cummins Heat Issue

200 degrees is fine, 220 to 225 then u starting to have problems, when they replaced the thermostats did the replace the lower seals, those could be leaking around the thermostats and acting like the stat is a partially open

 

My N14 book that came with the truck says the thermostat doesn't fully open till 212. Fan on mine doesn't come on till 205 or so. Normal temp on mine is around 195-200 but will get to 210-215 at times. it is a 460 N14+

 

its better to be cautious than sorry

 

Yeah something like that would do it BIG TIME. Considering that if those fins corrode off the radiator fins you loose the heat transfer out of the coolant to the air. I had seen stuff like that in uncoated radiators built in the 60's that were bi-metal a combo of Alumimun fins/copper tubes were the alloy fins came apart from salt but never in a copper and brass Radiator. I called my old shop foreman at my first OTR company man has been keeping rookies on the road since before I was a gleem in my dads eye. He was like HOLY CRAP then he remembers seeing a TSB this. Seems that when Cummions was changing the Nalcool formulas they had a few issues with the radiators doing this. The freaking Nalcool would leach out of the tubes and eat the FREAKING fins of the radiators.

 

Hello everyone I was reading all of your comments and it seems like 200° to 210° is ok, just had my N14 rebuild and the radiator cleaned up when is just idling the temperature is at 179° and on a pull goes up to 210° but the fan kicks in at 202°