Coolant error
Thread Starter
Track Day
Joined: Sep 2025
Posts: 21
Likes: 2
From: North of Sweden
Coolant error
06 Turbo WLS
Cold starting the car get an "check coolant level" error. After the car has warmed up a bit and restarting it, the error dissapears. Coolant is on level. Sensor problem?
started when got cold weather(living in Sweden North).
also servatronic not working properly. Used to turn the steering wheel with one finger now its just feels like driving any other car with power steering. Not as soft and easy as it used to be. Fluid on level. Driving fast/slow doesnt change anything. Started uncommanly now all the time like that. Doesnt get any worse though. Servatronic system itself? Not easy to get a service here in North.
Cold starting the car get an "check coolant level" error. After the car has warmed up a bit and restarting it, the error dissapears. Coolant is on level. Sensor problem?
started when got cold weather(living in Sweden North).
also servatronic not working properly. Used to turn the steering wheel with one finger now its just feels like driving any other car with power steering. Not as soft and easy as it used to be. Fluid on level. Driving fast/slow doesnt change anything. Started uncommanly now all the time like that. Doesnt get any worse though. Servatronic system itself? Not easy to get a service here in North.
Rennlist Member
Joined: Dec 2005
Posts: 749
Likes: 114
From: Kansas City
well, it could be something deeper, but on the basic note once the vehicle warms the coolant expands and my be satisfying the level requirements. As for the steering, I would guess that the rack has failed. Typically if the pump fails it will sing to you in my experience.
GL
GL
Thread Starter
Track Day
Joined: Sep 2025
Posts: 21
Likes: 2
From: North of Sweden
well, it could be something deeper, but on the basic note once the vehicle warms the coolant expands and my be satisfying the level requirements. As for the steering, I would guess that the rack has failed. Typically if the pump fails it will sing to you in my experience.
GL
GL
the servatronic though. When i start the car for few seconds it feels like working and then again not. Checked the fuse-all good too.Pump doest make any sound.read that sometimes need to wait few second after putting the key in ignition and only then start,doesnt change anything.Know that some entuziast like to take fuse out for "better" feeling the steering but i liked it as "feather" it was..
Rennlist Member
Joined: Dec 2005
Posts: 749
Likes: 114
From: Kansas City
another small consideration, it is my understanding that these coolant system are self bleeding. That being said if when it was changed there was air trapped it could have been purged and lowered the level just enough.
Race Car
Joined: Aug 2017
Posts: 4,927
Likes: 2,531
From: Central MA
When the air temperature is cold (below 25F) servotronic in mine doesn't work. After driving 10 minutes and shutting off the car, servotronic works normally when restarting.
I flushed out the Pentosin last year, still the same. I suppose there is something sticky inside the steering rack. I am leaving it as is.
I flushed out the Pentosin last year, still the same. I suppose there is something sticky inside the steering rack. I am leaving it as is.
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Instructor
Joined: Sep 2022
Posts: 137
Likes: 28
From: SoCal
You're either low on coolant or have air trapped in the system. With a completely cold engine, is the coolant level below min, or over min? If it's below min, you simply have low coolant. If it's between min and max, you have air in your system. Later Cayennes are self bleeding but 03-06 are not - while some find success burping it like normal, you really need an airvac to really get all the air out.
With the car cold, open the coolant cap and start the car. Put the heat on high, fan on low (2-3 ticks) and recirculation on. Wait 5-10 mins for the car to heat up, the thermostat to open, and coolant to start moving through the heater core. You should see the coolant start to drop, at which point start adding some coolant to get past the min line. If the coolant doesn't go anywhere once the car is warm, you have an air pocket which will require you to drain the entire system and vacuum fill.
As mentioned above, coolant contracts when cold, so if you're low, it will show low coolant on start, and then once it expands, it will sense a normal coolant level and the alert will go away. Otherwise you have an air pocket that's stuck over the coolant sensor that goes away once the car starts circulating coolant.
With the car cold, open the coolant cap and start the car. Put the heat on high, fan on low (2-3 ticks) and recirculation on. Wait 5-10 mins for the car to heat up, the thermostat to open, and coolant to start moving through the heater core. You should see the coolant start to drop, at which point start adding some coolant to get past the min line. If the coolant doesn't go anywhere once the car is warm, you have an air pocket which will require you to drain the entire system and vacuum fill.
As mentioned above, coolant contracts when cold, so if you're low, it will show low coolant on start, and then once it expands, it will sense a normal coolant level and the alert will go away. Otherwise you have an air pocket that's stuck over the coolant sensor that goes away once the car starts circulating coolant.
Thread Starter
Track Day
Joined: Sep 2025
Posts: 21
Likes: 2
From: North of Sweden
You're either low on coolant or have air trapped in the system. With a completely cold engine, is the coolant level below min, or over min? If it's below min, you simply have low coolant. If it's between min and max, you have air in your system. Later Cayennes are self bleeding but 03-06 are not - while some find success burping it like normal, you really need an airvac to really get all the air out.
With the car cold, open the coolant cap and start the car. Put the heat on high, fan on low (2-3 ticks) and recirculation on. Wait 5-10 mins for the car to heat up, the thermostat to open, and coolant to start moving through the heater core. You should see the coolant start to drop, at which point start adding some coolant to get past the min line. If the coolant doesn't go anywhere once the car is warm, you have an air pocket which will require you to drain the entire system and vacuum fill.
As mentioned above, coolant contracts when cold, so if you're low, it will show low coolant on start, and then once it expands, it will sense a normal coolant level and the alert will go away. Otherwise you have an air pocket that's stuck over the coolant sensor that goes away once the car starts circulating coolant.
With the car cold, open the coolant cap and start the car. Put the heat on high, fan on low (2-3 ticks) and recirculation on. Wait 5-10 mins for the car to heat up, the thermostat to open, and coolant to start moving through the heater core. You should see the coolant start to drop, at which point start adding some coolant to get past the min line. If the coolant doesn't go anywhere once the car is warm, you have an air pocket which will require you to drain the entire system and vacuum fill.
As mentioned above, coolant contracts when cold, so if you're low, it will show low coolant on start, and then once it expands, it will sense a normal coolant level and the alert will go away. Otherwise you have an air pocket that's stuck over the coolant sensor that goes away once the car starts circulating coolant.
Last edited by ralfs strazdins; Oct 20, 2025 at 06:29 PM.
Thread Starter
Track Day
Joined: Sep 2025
Posts: 21
Likes: 2
From: North of Sweden
You're either low on coolant or have air trapped in the system. With a completely cold engine, is the coolant level below min, or over min? If it's below min, you simply have low coolant. If it's between min and max, you have air in your system. Later Cayennes are self bleeding but 03-06 are not - while some find success burping it like normal, you really need an airvac to really get all the air out.
With the car cold, open the coolant cap and start the car. Put the heat on high, fan on low (2-3 ticks) and recirculation on. Wait 5-10 mins for the car to heat up, the thermostat to open, and coolant to start moving through the heater core. You should see the coolant start to drop, at which point start adding some coolant to get past the min line. If the coolant doesn't go anywhere once the car is warm, you have an air pocket which will require you to drain the entire system and vacuum fill.
As mentioned above, coolant contracts when cold, so if you're low, it will show low coolant on start, and then once it expands, it will sense a normal coolant level and the alert will go away. Otherwise you have an air pocket that's stuck over the coolant sensor that goes away once the car starts circulating coolant.
With the car cold, open the coolant cap and start the car. Put the heat on high, fan on low (2-3 ticks) and recirculation on. Wait 5-10 mins for the car to heat up, the thermostat to open, and coolant to start moving through the heater core. You should see the coolant start to drop, at which point start adding some coolant to get past the min line. If the coolant doesn't go anywhere once the car is warm, you have an air pocket which will require you to drain the entire system and vacuum fill.
As mentioned above, coolant contracts when cold, so if you're low, it will show low coolant on start, and then once it expands, it will sense a normal coolant level and the alert will go away. Otherwise you have an air pocket that's stuck over the coolant sensor that goes away once the car starts circulating coolant.
Thread Starter
Track Day
Joined: Sep 2025
Posts: 21
Likes: 2
From: North of Sweden
opened coolant cover,started the car. Did everythig as post before mentioned(heater on 2 and recculation of air in salon) waited 10minutes for termostast to open. The coolant didnt drop but whent from middle to above max mark. Car warmed up,warm air in salon. Everything normal. Still coolant error msg. Restred the car and error went away
still every time staring the car shows the error. After warm and restarting it goes away.
still every time staring the car shows the error. After warm and restarting it goes away.
Last edited by ralfs strazdins; Oct 23, 2025 at 09:06 PM.
Instructor
Joined: Sep 2022
Posts: 137
Likes: 28
From: SoCal
Yeah that's your coolant expanding once heated. You either still have an air pocket which is conveniently right over your coolant sensor, or the coolant sensor itself is faulty. Either way not a huge deal (besides the sensor being an absolute pain to get to), but try parking with the front right tire elevated higher than the rest of the car. It may take a couple heat cycles, open cap, check, run, recheck, let cool, open cap, recheck, etc. to get there, but eventually it should burp out. If you're still in the same place, you should definitely run a scan tool and look for a sensor fault. That may be your culprit, but sounds like air given the fault goes away.