Temperature Gauge not working, AFM inoperable, radiator fan stuck on h

Sethp78 · January 23, 2023

Yes please do keep us updated ben.doyle.37. My vehicle is still having this problem and I've oretty much just given up on fixing it at this point and just reset it every time it happens.

Sethp78 · January 30, 2023

On 1/23/2023 at 4:06 PM, ben.doyle.37 said:

Hey guys,

dealing with the same issues. Replaced the thermostat and temp sensor, reset computer and still having the same issue. My truck is a 2018 Chevy Silverado 1500 5.3. I’ve also replaced the radiator before this. My brother is a mechanic, he’s going to put the computer on it this afternoon and see if we can find anything as to the reasoning behind this. I’ll keep y’all updated and any advice would be greatly appreciated.

Were you able to come up with anything on this Ben?

hexen · December 24, 2023

Having the same problem. '14 silverado 5.3 . Changed sensor and thermostat. Lost some fluid while changing . Didn't think it was much. Drove around to see if anything changed. Fans still on high, gauge flat lined. Checked fluid and realized res was pretty much empty. Filled and repeated the drive. No change. Upper rad hose was cold and felt empty. Did not check with scanner or pull cables off battery. So.....would the low coolant cause this issue to continue? Could there be a bubble stuck at the thermostat? Any help would be great

Texasdeere · December 25, 2023

Try removing the Neg Battery cable for a few minutes to reset the system. This should kill the fans and the temp gauge should read normal afterwards.

ELo2017 · January 6

Has anyone tried changing the relay and/or fuse for the fan? I ask because I'm having the same problems and changed out both the thermostat and sensor. Fan kept running after thermostat, but stopped working at all before I got chance to replace sensor. I figured the relay and/or fuse blew from fan constantly running, but when I checked the fuse box...neither was even there! Confused as to how they could run without them. Hoping my fan didn't go out with no relay, because it was obviously running without one.

Leon2003 · February 14

I have a 2016 silverado with a 5.3 I changed the temp sensor and the thermostat and the fans are still stuck on high coolant is full what should I try next.

ELo2017 · February 15

Disconnect the battery, can't skip that step. Resets engine cpu

awright2009 · March 14

Hello, running into this issue now at about 150k miles. Long road trip to the Guadalupe mountains, about one entire fuel tank worth of distance cruising down the highway.

Turned truck off that night, no problems, camped near the truck, no noises or leaks that I could tell

Headed to the national park visitor center the next morning and when I turned it off the radiator fan kept running. Looked under the hood and didn’t really see anything. Radiator overflow tank had fluid. Suspecting the sensor or the thermostat. The fan turns off eventually. Later that day after hiking the Guadalupe peak I noticed the temp stays at 160 degrees pegged low. I stop at a rest stop not too far away and the same issue, fan turns on, eventually turns off.

I got back on the road running the heater full blast, watching oil pressure like a hawk, ambient temperatures were 75F or so high with 50F lows, so not anything extreme. Get to a hotel as I wanted a shower pretty bad at that point. The fans stop again, impossible for them to stop that fast if it were really over heating

Next morning after the hotel stay, everything works, temps normal and no radiator fan issue

I was ready to replace the thermostat and sensor, but if it works now I won’t bother. I assume the long drive stressed a relay or sensor and normal shorter drives fixed it

Edited March 14 by awright2009

awright2009 · March 15

So, looking into videos now, found this one that shows the thermostat and sensor location, not too sure about using teflon tape on there, but a good reference: