Engine Hot/AC Turned Off message

[02Z71Raven]

I wouldn't worry about the connector unless it is visibly fried or has signs of deterioration

It's not great looking, lol and it's only $5 and I'm a pro at wiring, soldering etc... I often replace them if they make uncomfortable. I'll try just the sensor first though and see what happens. Soldering in that spot isn't going to be easy, so it may be best to do them one at a time anyway, for science.

 

[iLikeEggs]

I wouldn't worry about the connector unless it is visibly fried or has signs of deterioration

Most coolant temp sensors come with a connector and pigtail. It's a good idea to replace the old one as the wires break close to the connector and it's hard to see sometimes. If you're over 100k I would replace the connector.

 

[iLikeEggs]

Might as well revive this thread...
I was driving across town and the AC Engine Hot message came back, fan came on, temp gauge went flat. It's been a while since that happened so I did a search and saw where someone suggested to do a scan and clear the codes. I happened to have my scanner so I plugged it in. It said something about the coolant temp sensor sobi cleared it. Sure enough, everything went back to normal. I also or read that this was caused by a minor glitch where the ECM will conflict the outside temp with the coolant temp sensor when it's around 59F out and throw the message on the DIC and crank the fan. Sure enough, it was 59F out. No problems since then. Supposedly it's a common problem across the GMT900 platform.