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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.

Back in May my 2015 Silverado dropped a lifter. I sent it to a shop and had a BTR stage 2 cam installed and since I've gotten it back it has had overheating problems. It had slight overheating problems before but never over 215 F-220 F. Fans do come on with the AC in low and once it starts getting warm they kick on in high. My issue now is its had a new water pump, temp sensor and thermostat put in and it runs 220F to 230F regularly. planning on buying a radiator before long and giving that a shot. Any advice would be greatly appreciated. truck.heic

06 Silverado 2500hd 6.0 My Silverado is getting really hot while towing up hill, to the point that the "Engine Coolant Hot" light is coming on. (Which I stop and let it cool down). This has gradually gotten worse. Truck does not get hot while towing on flat terrain. Any ideas?

Have a 2014 4.3 Silverado with around 180k miles. About two weeks ago I noticed that whenever I’m driving (any speed) and press the gas pedal halfway or more for about 5 seconds I notice it starts to go from normal 210° to around 220° once I start to see it go up I let off and it goes back down. I could let it idle with the ac on and it’ll never go past 210 only when I step on it even with the ac off. The coolant is always at the top, the fans turn on when the ac is on , I haven’t seen any leaks, the radiator hose is hot after driving and radiator doesn’t have too much build up on it from the outside . I’ve replaced the thermostat twice in the past year and a half because both times they went out and marked 0° the whole time while driving causing my fans to always stay on (I just disconnected the battery for 10 min and after it would only mark around 100° but I only did it so the fans wouldn’t turn on, and It ended up being the housing) I also don’t think it’s the thermostat because otherwise it would go up and down like the other times And it only goes up when I know it will (when I floor it a little bit). Any idea what it could be?