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Merry christmas everyone. I have just returned home to Adelaide after spending christmas day on Yorke Peninsula towed van over and back uneventful until about 50ks from Adelaide i noticed the temperature guage jump from its normal position at 90 up to 95 then back to its normal position it did this a number of times I moved gear down to m7 seemed to help I normally leave it in drive and let it sort itself out.. I was travelling at about 90kph at the time the outside temperature was 29° and a bit of a side wind the van weights about 2.8 tonne I have never seen this happen before the car has only done 53k and serviced 6k ago the fluid level is correct and looks clean it is blue. My question is this fluctuation normal? I have had the car since march this year and towed the same van to Darwin and return and never noticed the guage move in similar heat
 

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I did another search on here and goind some posts on the guage fluctuating when towing and the suggestion seems that it is normal to fluctuate it is a bit unnerving seeing it move so quickly up and down
 

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Merry christmas everyone. I have just returned home to Adelaide after spending christmas day on Yorke Peninsula towed van over and back uneventful until about 50ks from Adelaide i noticed the temperature guage jump from its normal position at 90 up to 95 then back to its normal position it did this a number of times I moved gear down to m7 seemed to help I normally leave it in drive and let it sort itself out.. I was travelling at about 90kph at the time the outside temperature was 29° and a bit of a side wind the van weights about 2.8 tonne I have never seen this happen before the car has only done 53k and serviced 6k ago the fluid level is correct and looks clean it is blue. My question is this fluctuation normal? I have had the car since march this year and towed the same van to Darwin and return and never noticed the guage move in similar heat
My question is unless your color blind why is the coolant blue ?

G12+,++ pink, G13 Violet ?

only G11 from VW in the 1990's was blue.

regards
Drag
 

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No I'm not colour blind it was serviced by VW in Alice Springs how would I know what colour it is supposed to be? I would expect VW to use the correct coolant but i will check it out thanks for pointing it out
 

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My question is unless your color blind why is the coolant blue ?

G12+,++ pink, G13 Violet ?

only G11 from VW in the 1990's was blue.

regards
Drag
My apologies I am colour blind in the sun it looked bluish but you are right it is pink thanks for
 

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Apologies for the not metric temps, but you will get the idea.

The water temp gauge lies. When I did research, I found out that it is a fairly common practice. Apparently people who had no idea how a thermostat open and closes complained under warranty that the car would not sit on 195 degrees but would move from around 200 to 190. Then they complained that the car would go slightly over 200 going up hills. Use your imagination. The complaints went on and on.

The water temp gauge now sits behind a computer nanny (software) that lies. I went thru a period when the engine was only running at 180. Thermostat was failing. I sensed something was wrong, but I trusted that lying gauge. I finally figured it out, months later. I no longer trust anything that is on the drivers display.

I knew that the gas gauge was adapted and gave you an average reading. The touareg manual tells you that the outside temp was adapted. It gives you the average reading and will only move up and down a degree every x seconds.

However, I expected that the water and oil temp were real time actual readings. Sigh, apparently sometimes I am an idiot.

I can tell you that my gauge will sit dead on "center normal" until the water temp goes below 175.

What works to get real readings?

VCDS always has the real numbers, but it is too cumbersome to keep a laptop running.

What works and is practical?

Those OBD readers that plug into the car and uses an app on your phone. Since water temp is a mandatory OBD parameter, you can just use your phone and watch the real water temp in real time. It will go up and down as the thermostat works. It will go up when towing. It will be higher going up a long hill compared to going down a long hill. It will be the real number.

I move my OBD reader between vehicles. It is pretty handy since I always have the phone on me.

Many truck people that tow buy a display that is permanent. ScanGauge is one example.

I did another search on here and goind some posts on the guage fluctuating when towing and the suggestion seems that it is normal to fluctuate it is a bit unnerving seeing it move so quickly up and down
To answer your question, there is a point where the software decides to move your gauge to the next level. So you are in the temp zone that centers the gauge on normal. You go up a degree or two, but it moves you into the next zone. The gauge moves quickly form zone1 to zone2.

If you are towing, get a cheap car to phone OBD adapter and a cell phone app. You will be glad that you did.

Hope something in this helps.
 

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Well an update I had to go and collect an empty car trailer today the outside temperature 41° and a very steep hill for 2 kilometres on the way there. Temperature guage remained on 90 slight movement near the top but appeared normal. The return trip was uneventful with a few smaller hills the trailer weighed about 500 kilos temperature guage remained on 90 still 41°. And if there was a problem it would have showed up. I am assuming yesterday was normal but I will get a radiator pressure test
 

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All you know for sure from the above test is that the water temp stayed in the range where the computer software pegs the needle in the middle of the normal range. It would indicate that everything is fine with the system, but you still have zero idea what the actual real time reading is.

If you have questions about what the cooling system is doing, the best way is to read the sensors in real time and see what is happening. You can see if you have a partially open thermostat, a partially closed thermostat, or a weak water pump by watching what the temps do in real time.

Search for elm327 bluetooth obd if you want to see what the little phone adapters are and what they cost in your area. I can purchase them delivered from amazon for about $10 in the US for android only versions. iPhone compatible versions cost a little bit more.

You can also get custom versions that come with their own software for more. There is Blue Driver and FixD brands being sold.

Or perhaps you would like the VW Carnista app. https://caristaapp.com/vehicles/vw
 

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Once my Touareg is warmed up, I never notice the temperature gauge move off the 90C even towing 1500kg - my Scangauge does show the variation although I've never seen that go above 97C
Scanguage, your best friend when towing. :D

That is the way it works.

When my thermostat stuck partially open and refuse to close fully, I saw temps of 90 C (195F) on the dash the entire time, even though the real engine temp was 82 C (180 F).

MPG down, car running rich, long time trim off, carbon around tailpipe. Told VCDS to log the O2 sensors, thinking those were dying. Decided to log some other things. Took a long drive. Looking at pretty dash guage, perfectly stuck dead on 90C.

Stopped and started looking at logged data. Water temp never went up to normal. Did my Yosemite Sam impersonation.

 

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Merry christmas everyone. I have just returned home to Adelaide after spending christmas day on Yorke Peninsula towed van over and back uneventful until about 50ks from Adelaide i noticed the temperature guage jump from its normal position at 90 up to 95 then back to its normal position it did this a number of times I moved gear down to m7 seemed to help I normally leave it in drive and let it sort itself out.. I was travelling at about 90kph at the time the outside temperature was 29° and a bit of a side wind the van weights about 2.8 tonne I have never seen this happen before the car has only done 53k and serviced 6k ago the fluid level is correct and looks clean it is blue. My question is this fluctuation normal? I have had the car since march this year and towed the same van to Darwin and return and never noticed the guage move in similar heat
Had the same experience with my 2015 Tourareg, towing from Geelong to Adelaide (17’ van at 100kph). It was very disconcerting watching the gauge go up and down, specifically when it was under load, but sometimes just on the long straight flat stretches of road. Contacted VW Aust, service advisors, and local VW service centre dealerships, and they couldn’t offer any advice apart from saying the new technology in the new vehicles such as the Tourareg more accurately reflected vehicle operating temperatures. After having it noted at my local dealership that I had reported this concern, while the vehicle was still under warranty, I lived with it and like yourself it only occurred when towing. I later met another Touareg driving caravaner and asked if they had ever experience what I have described, which he had and he said when he raised it he was told to tow in ‘Sports’ mode and not ‘Drive’ which I had been doing, diesels he had been told worked more efficiently when they were under load ( I’ll let the auto engineers/mechanics debate that!) Having since done All my towing in Sports mode I have had no issues, the gauge just sits at normal, and have now done multiple trips to SA, NSW, and Qld, without any issues, fuel consumption did increase a little, but it really wasn’t worth worrying about, given the peace of mind I had watching the fuel gauge remain stable!!!
 

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Thanks for the reply I did take it out of drive for awhile and it did seem to be steady. Then we hit the 60kph zone and speed and temp remained steady on 90. What seemed odd is that not long prior to that we had completed a trip to Darwin and return and guage remained steady we were towing about 2.7 tonne. I did have a normal service at Alice Springs. I will get a radiator pressure test for peace of mind car still has low ks I think just 52k and service books show regular services
 
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