Mr. Pibb

I have not been able to resolve the issue. I continue to be told that it’s “normal”. This issue continues to puzzle and frustrate me. I’ve read the comments about head gaskets, radiator leaks, etc and that’s solid information but I have a wrench to throw in that. 1st, I have no coolant loss and 2nd, Wouldn’t those issues persist at any and all times when the engine is running (Hwy, City, or Idle) which is not the case here. This is happening during acceleration, from a stop light/sign, getting on the hwy, or passing. I’m obviously not an expert and I apologize if I sound like an idiot here. I still think this could be the fan or shutters. Fan doesn’t show any issues on a diagnostic. However, maybe someone can answer this; If the fans are functioning but either the high / low speed isn’t, (I believe the fans have multiple speeds) would that show on a diagnostic. Basically could it not be operating correctly but enough to fool the diagnostic. 2nd idiot question, I know the dealer has told me if there is any issue with the shudders, it will immediately throw a check engine. Well is it possible they are not opening as quickly as they should, allowing the engine temp to climb higher than expected. The aftermarket thermostat is an interesting thought. I guess the question here is are there any negatives to running a 160 vs. OEM. I know several have noted that this didn’t fix the problem but maybe it would at least help counter the higher temps until the issue is identified. I truly appreciate all the time and info provided by everyone. I hope that a clear resolution can be found & documented at some point to help everyone impacted.

I had experienced the fans running even after the engine was off before the temp sensor change. They still seem to be running more than usual but haven’t been running after the engine is off.

OEM, for the Thermostat and Temp Sensor

No Mods, 97k miles

Need Help Please!!!! I truly appreciate anyone that reads this long post. Hopefully someone can help me figure this out. Bought my 2017 Silverado CrewCab LT Z71 new. For 5 yr & 10 mo. the temp gauge sat at 210 with no issues and no variation. Then, in June 2023 the temp started rising about 10 degrees and would fluctuate from there back to normal. Thermostat was replaced, didn’t resolve the issue. Temp sensor was replaced, didn’t resolve the issue. Truck is well maintained, radiator/coolant flushes done a normal intervals with no issues found. Dealership has checked out this issue 3 times and says it’s operating as normal, temp fluctuation is normal. I have been calling BS on this since June, how is this normal? Almost 6 years with no variance but now it’s normal? So here I am in October, with continued temp issues that are anything but “normal” The temp gauge has progressively increased, the gauge goes up to 245-250 then will drop back down to 210 and fluctuates between 210 - 230/235 as the drive continues. Things to note: I have never had a Check Engine light, adding to the frustration. Coolant level doesn’t change, no leaks whatsoever. This temp issue does not happen when idling. I’ve idled for 20-30 min both from cold and after driving with the issue happening, no fluctuation. I have thought through some other possible issues but then wonder could it be “this” when the issue is not consistent or throwing codes. Are the active shutters not opening / operating correctly, that should throw the check engine light Belt is loose, again should be a more consistent issue with sounds and other functions having issues. Water pump going out, again I think that would cause more consistent issues and would overheat the engine. Fan(s) going out, wouldn’t that be more of an issue when idling vs driving and would be a more consistent issue. Could this be some other sensor, relay, electrical issue. Any help, experience, and/or suggestions you have on this issue are greatly appreciated.