Hi Everyone, first time here. I got a new to me 2013 911 991.1 4S PDK. I recently got a message on my screen to check the coolant system. Started tracking the temperatures on the car and this is what i observed. The water temp goes up slowly to 194 and it does not move from there at all. If the car gts shut off it cools down. The temperature on the oil though, runs around 220F while driving in the city and goes to 230F on the highway which concerns me and at that point i stop to cool it off. The fans are kicking on and i can hear the front two and the back small ones on top of the engine. By the way I’m not driving the car aggressively at all. The moment i get from the highway down on the streets the temp drops to 220-225F which is still high. I know that the car had installed H&R suspension in the past that has it 0.5 inches lower than standard. Not sure if this has something to do with it or I need to be looking at water pump replacement, sensors or I need to look into another direction? Any help would be appreciated.

 

Sounds normal. The water temp is programmed to be a dummy gage while operating in normal temperature ranges, so it will display 194F (90 C) between a range that goes up to around 220+ and then all of sudden pop back to the actual read temp. The oil temp can go much higher, but I would say your temps are on the higher end of the normal range. The car burns cleaner at higher temp so in Normal mode the car runs hot to keep emissions clean. You should pop it into Sport/Sport+ and see the temps drop as more cooling circuits are activated with a more aggressive cooling profile. If you want to reprogram the water gage to read actual temp you can do it with ThinkDiag or aftermarket tune.

 

Your oil temperatures are just fine, that's where they should be. I wouldn't worry until around 250f for street driving.

The water temp will show 194f when the coolant is anywhere between 176f and 230f. I've documented how to "fix" this here --> https://rennlist.com/forums/991/1283...t-the-fix.html

 

Yep, try this. 230 is on the higher side but not considered dangerous. Where do you live? I was in TX last week for work and daytime temps are starting to get to 100 degrees plus. On really hot days, even under normal driving conditions, your oil temps will definitely creep up there.

 

One (or more) of your "Change Over Valves" COV's have died.

 

I live in Pensacola FL, so yes, the temps are up these days in the 90F range. I should have mentioned that in my post. I will try to drive it in sport today and see how it reacts.

 

I will take it to a local shop today to read if any codes show up. Would the died COV show up on it? Thanks!

 

You could also just have an air bubble floating around in your coolant. Have you looked at your Coolant float level. the ball should be in the middle. If the ball is not in the middle fill accordingly. Drive around a bit and see if message reappears. Check the easy stuff first.

 

You have been given great info in the above posts.

Drive in reg mode. When temp gets high and stabilizes put into Sport mode. Temps will go down.

Check coolant levels. Don’t open the coolant cap until coolant temp is below 120F. (Per Porsche)

 

Somewhere on the 991 forum there's a string about reprogramming the gauges to read actual temperature versus the current programming where the gauges will display a single temperature for a range of actual temperatures… in other words, (example ) the current programming makes it so the gauge will read 190 if the actual temperature is between 185 and 203 (for example).

 

this is only for water temperature. the oil temperature gauge does not have this logic.

 

230F....even 237F oil temp is totally normal on the highway in "Normal" mode. Sport and Sport+ will drop the temps quite a bit.

*Side note* Your actual coolant temp in Normal on the highway is likely 217-221F (not 194F as indicated). PDK Oil runs 215-220F also in Normal.

 

Unfortunately not for all of them. For a lack of a better description when they go bad they go from a rectangle looking thing to a budging rectangle looking thing.

There are a few good threads on COV failures in here somewhere.

 

Update: I drove the car in normal mode and let it get up to 226-228F. Kicked on Sport mode and the temps immediatelly dropped. Drove it around and all seems well. But, it still gives me the code to check the coolant system to a shop. I had one local shop scan the codes and he told me that there seems to be some sort of an issue with the vacum system which confirms what everyone here is being pointing at. I will need to wducate myself on how to track this down exactly to what it is from the vacum system. Any guidance on that? Btw, I can’t say how thankful I’m to everyone giving me guidance here, you guys are great!

 

change over valves (COVs) are vacuum-actuated, hence "the vacuum system" being cited as problematic. COV failures are common on these cars.

Big ol' thread about them here: https://rennlist.com/forums/991/8002...-on-991-a.html

There are some half dozen or more in the car. They control things like coolant flow routes, sound symposer activation, intake stuff, and exhaust stuff.