2016 Yukon multiple intermittent issues

[OutlawJ01]

Hello, I am new here and hoping to maybe get some direction on a problem we are having with our 2016 Yukon Denali. Over the past several months the engine fan will start running at high speed and continued even after the engine is completely shut off for several minutes. It only happened about every six or eight weeks. In between there were no problems.

The engine temperature gauge when the fan was blowing on high read in the low normal range. A couple of times I disconnected the battery, so it wouldn’t run down after the engine was stopped, and either this or just the fan finally stopping seem to reset things and everything worked again. I thought it was the coolant temperature sensor going bad, so I replaced it. No problems for a couple of months and I thought it was fixed but today it happened again.
Interestingly, at the exact same time you could hear the fan go on high, the AC stopped cooling.

On another occasion, the door locks stopped working at the same time as well. They seem to be unrelated, although it makes me wonder now if the ECM or relay module could be the problem, where all these apparently unrelated things might converge. I get no engine lights, and checked an OBD scanner a few times with no errors.

I am hesitant to take it to a mechanic since it is such an intermittent problem and likely won’t happen when they have it in and testing it. Has anyone ever heard of anything like this or anything I can check additionally to troubleshoot? Many thanks in advance of any ideas.

I am currently going through the SAME thing with my 2016 Yukon XL. Replaced the temperature sensor with an AC Delco & within 3 weeks started doing the same thing then replaced with Autozone Duralast brand & now after 3 weeks it started the same thing (no temp reading, & fan blowing hard & long after i shut off the engine) so now I'm thinking maybe the wire or connector is bad. Idk... I hear buy oem (I know AC Delco IS OEM but the first one (OEM ONE) lasted less time than the store brand one (Duralast) so idk if a new wire/coupler will fix it...

 

[Doubeleive]

I am currently going through the SAME thing with my 2016 Yukon XL. Replaced the temperature sensor with an AC Delco & within 3 weeks started doing the same thing then replaced with Autozone Duralast brand & now after 3 weeks it started the same thing (no temp reading, & fan blowing hard & long after i shut off the engine) so now I'm thinking maybe the wire or connector is bad. Idk... I hear buy oem (I know AC Delco IS OEM but the first one (OEM ONE) lasted less time than the store brand one (Duralast) so idk if a new wire/coupler will fix it...

the oem one should have a warranty take it back, so should the duralast. try again..... there are just a bunch of bad ones out there
if it was the connector it wouldn't make it 3 weeks and fail again, if that was the case you could just unclip it and recliip it and be down the road again for another 3 weeks