Cadillac STS-V Series Forum Discussion, cluster message: ENGINE HOT - AC OFF in Cadillac V-Series Forums; got a wierd message today. I was driving in the snow, 8 degree michigan weather. After 10 minutes of driving, ...
got a wierd message today. I was driving in the snow, 8 degree michigan weather. After 10 minutes of driving, and 4 minutes from home, the cluster said ENGINE HOT - AC off. It then disabled my AC. I tried to turn it on just to see, and it wouldn't come on. At the same time, my temp gauge needle stopped working and went to the cold side.
I used the dash to determine that engine oil temp was 158 and not rising. Trans temp was 98, so I kept driving (did I mention it was snowing). Got home, and did notice the cooling fans running on full as I pulled in the garage.
anyone have this happen? still covered under the CPO, but this may be hard for them to reproduce.
Coolant temp gauge always goes to zero when this happens. Do a search, this has happened to almost all of us,lol. Its as he said, not getting up to temp,usually a thermostat. The computer really needs a software update to fix this issue, Cadillac should have realized this by now.
Just happened to me last month. Easy fix. Be sure to take your existing thermostat to the parts store. Advance auto parts had two listed. Unfortunately the one I bought was too big. Second time worked perfectly. Took me about 4 hours. I am a complete novice and spent lots of time looking around checking other things out. Good luck. Oh FYI. Thermostat was 15$ if I remember correctly but had to get new gasket from dealer. It was 8 dollars.
Mine started this today. Showed the messaage and temp gauge stays on cold the whole time as soon as i start it up. I am guessing it's the temp sensor and not the thermostat since it does it as soon as it starts. Am I rite?
there is also a update for the engine control module for it setting a p0128 intermittantly. coolant not getting to operating temp, mine did it right after i bought it put the install in as well as a thermostat just to be safe