GolfGTIforum.co.uk
Model specific boards => Golf mk7 => Topic started by: iandjm on 02 November 2016, 08:40
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Hi,
I have a 2017 MY Golf R with a heated windscreen. I previously had a 2014 Gti with the same function.
I have selected the tick box for auto mode windscreen heating in the climate setup screen. On my last Golf when I selected the windscreen demist button on the climate control, this also switched the heated screen on. On my R this does not happen. Also on my last golf the windscreen heating used to come on when needed, ie when the screen started steaming up (I could tell this as it showed up on the conveniene consumers list) This does not appear to happen on my new car.
Does anyone else have any experience with this?
Many thanks
Ian
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Hi,
I have a 2017 MY Golf R with a heated windscreen. I previously had a 2014 Gti with the same function.
I have selected the tick box for auto mode windscreen heating in the climate setup screen. On my last Golf when I selected the windscreen demist button on the climate control, this also switched the heated screen on. On my R this does not happen. Also on my last golf the windscreen heating used to come on when needed, ie when the screen started steaming up (I could tell this as it showed up on the conveniene consumers list) This does not appear to happen on my new car.
Does anyone else have any experience with this?
Many thanks
Ian
The answers no as really could not justify the phone kit for the pleasure, which is shame as imagine 99% of us would select as a standalone.
It was a 2 degree and frosted car this morning and did not have a scraper and thought be a long wait for screen to clear but it cleared so much quicker than the GTD? Is this because the petrol engine gets to temperature quicker?
But was always a painful wait in the GTD and would say it was just a couple of minutes and wipers shifted the frost and by minute or so more, clear screen
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Hi,
I have a 2017 MY Golf R with a heated windscreen. I previously had a 2014 Gti with the same function.
I have selected the tick box for auto mode windscreen heating in the climate setup screen. On my last Golf when I selected the windscreen demist button on the climate control, this also switched the heated screen on. On my R this does not happen. Also on my last golf the windscreen heating used to come on when needed, ie when the screen started steaming up (I could tell this as it showed up on the conveniene consumers list) This does not appear to happen on my new car.
Does anyone else have any experience with this?
Many thanks
Ian
The answers no as really could not justify the phone kit for the pleasure, which is shame as imagine 99% of us would select as a standalone.
It was a 2 degree and frosted car this morning and did not have a scraper and thought be a long wait for screen to clear but it cleared so much quicker than the GTD? Is this because the petrol engine gets to temperature quicker?
But was always a painful wait in the GTD and would say it was just a couple of minutes and wipers shifted the frost and by minute or so more, clear screen
Hi Yes the Gti & R have a very fast engine warm up. I believe only the cylinder head has cooling initially until the engine warms up, then the main block is cooled.
Ian
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Hi,
I have a 2017 MY Golf R with a heated windscreen. I previously had a 2014 Gti with the same function.
I have selected the tick box for auto mode windscreen heating in the climate setup screen. On my last Golf when I selected the windscreen demist button on the climate control, this also switched the heated screen on. On my R this does not happen. Also on my last golf the windscreen heating used to come on when needed, ie when the screen started steaming up (I could tell this as it showed up on the conveniene consumers list) This does not appear to happen on my new car.
Does anyone else have any experience with this?
Many thanks
Ian
The answers no as really could not justify the phone kit for the pleasure, which is shame as imagine 99% of us would select as a standalone.
It was a 2 degree and frosted car this morning and did not have a scraper and thought be a long wait for screen to clear but it cleared so much quicker than the GTD? Is this because the petrol engine gets to temperature quicker?
But was always a painful wait in the GTD and would say it was just a couple of minutes and wipers shifted the frost and by minute or so more, clear screen
Hi Yes the Gti & R have a very fast engine warm up. I believe only the cylinder head has cooling initially until the engine warms up, then the main block is cooled.
Ian
My last 9 years have been performance diesels so my expectation of time to wait was pretty set so it was a really nice surprise this morning when the full blast on screen showed them thawing patches so quickly and in no time at all really and definitely in comparison was able to set off.
The rationale makes total sense and thanks for explaining.
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Petrol burns hotter than diesel
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Petrol burns hotter than diesel
Nope.
Petrol burns cooler than diesel in engine combustion - the main reason why you get far fewer mpg with petrol. Petrol is only about 8% less calorific than diesel, but at the lower operating temperatures (lower peak temp of ignition and power stroke) of a petrol engine, there's less expansion under combustion. They do end up with a hotter exhaust as the larger expansion of the diesel cools the exhaust gases more - more of the energy generated by the petrol is lost to the exhaust gases. There isn't a hell of a lot more energy in diesel, but it is combusted in a much more efficient way.
Petrols warm up quicker than diesels because they can get to their lower optimum operating temperature much quicker.
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This varies for the engine design, and is also during the cycle and according to use e.g. running lean is hotter. For a particular petrol engine a figure for the average temperature in the cylinder during combustion stroke is 820°C. Near the walls the temperature is closer to the engine block and cooling system temperature, but in the middle of the flame it might be from 1650-2750°C (3000-5000°F) with 1950°C more likely, and the exhaust (manifold) can be 980°C. In some ways these temperatures are related to materials too. The engine design is a compromise between efficiency, power, smooth operation, reliability, emissions. With a petrol engine preignition/detonation is always just around the corner, so design tends to focus on that.
The auto-ignite temperature of diesel or petrol fuel is not much different, around 250°C. This is the temperature the fuel ignites by itself. Octane rating affects this in a petrol engine (to prevent pre-ignition as well as detonation). The energy in the burning fuel is a little higher with diesel. The compression is higher too, so this adds some heat before ignition.
For diesels the air temperature at the end of compression is 450 to 675°C. Peak temperatures during burning are like 2030°C.
The second link is a paper with some interesting plots. Here a diesel engine was converted to a spark ignition engine using CNG (compressed natural gas). You can see that at different engine speeds the diesel peak combustion temperature can be hotter or cooler, though at higher speeds (3600-4000RPM) they start to diverge with the CNG being cooler. There is also some attempt to explain these effects, in terms of fuel burn efficiency. Figure 8 shows maximum temperatures at different speeds, with diesel hotter at higher speeds as it is burning more efficien
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In general (and certainly the case for car engines), diesel ignites and burns at a higher temperature, with more of its chemical energy transformed into kinetic energy with the greater expansion following higher compression.
Higher octane fuel allows for a more efficient burn than lower octane, petrol getting a step closer to diesel combustion thermodynamically, but still limited on compression ratio by the need to ignite by spark rather than auto-ignition under compression. For lower output engines, the slight fuel savings gained would be eaten up by the higher fuel costs, so there's no push to make everything run on higher octane fuels.
Diesel effectively gives more bang (kunetic energy out) for the same energy in, within your typical automotive engine.
Even so, you can see the difference in speed of warm up temp as it gets colder. The last few days my R has been quite quick to get the oil temp up to 80c but much slower than normal to approach 100c and sitting at 98c rather than getting to 102c as it did in the warmer weather. Putting the heatinng on rather than not does slow the engine warmup too - a pity VW couldn't make more use of the heat the exhaust is kicking out to warm up the air beingput into the cabin when you put your heater on.
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Sooooo back to the wondscreen. Nobody else seems to have the heated screen?
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Sorry to be on topic but I have a 2016 with the heated screen. I too have selected the auto heating but it never seems to do it automatically either. I just put it on as and when required.
Its an expensive option but it's so useful for cold mornings.
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I have it too - but my estate is MY2014.
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Sorry to be on topic but I have a 2016 with the heated screen. I too have selected the auto heating but it never seems to do it automatically either. I just put it on as and when required.
Its an expensive option but it's so useful for cold mornings.
Think more so in a diesel than a petrol as it was 2 mins and near clear screen just on the screen defrost (blowers) this morning and no need to scrape whatsoever. (1 degree was on gauge)
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Sorry to be on topic but I have a 2016 with the heated screen. I too have selected the auto heating but it never seems to do it automatically either. I just put it on as and when required.
Its an expensive option but it's so useful for cold mornings.
Hi. Does yours come on when you select the windscreen max button on the climate control?
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Tried it this morning and no it doesn't.
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Tried it this morning and no it doesn't.
Looks like a programming problem on our models then as the manual says it should and my 2014 MY did. I can't believe you have to go into a sub menu when driving to turn it on.
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Sooooo back to the wondscreen. Nobody else seems to have the heated screen?
I have it on my GTD.Since i live in Scotland i use it quite a bit from Nov-Feb.As others have said.It (the diesel) takes an eternity to warm up so i knew i had to have it.Shame about the advanced tele prep crap you have to spec with it-but that's how it is with VW. :huh:
Mine is also set to come on automatically when you press the max demist button.I notice it de-ices quicker than it de-mists.I haven't had to switch onto manual heating as yet.Maybe the auto demist function isn't as good as it claims to be?.
I would get VW to check it out.Maybe your heating element is faulty?.
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Sooooo back to the wondscreen. Nobody else seems to have the heated screen?
I have it on my GTD.Since i live in Scotland i use it quite a bit from Nov-Feb.As others have said.It (the diesel) takes an eternity to warm up so i knew i had to have it.Shame about the advanced tele prep crap you have to spec with it-but that's how it is with VW. :huh:
Mine is also set to come on automatically when you press the max demist button.I notice it de-ices quicker than it de-mists.I haven't had to switch onto manual heating as yet.Maybe the auto demist function isn't as good as it claims to be?.
I would get VW to check it out.Maybe your heating element is faulty?.
Many thanks. You can check if it comes on with the max demist fuction as it shows up on the convenience w consumers list when it's on. It was fine on my Gti but certainly not ok the R.
I imagine it's a messed up new version of the software.
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Sooooo back to the wondscreen. Nobody else seems to have the heated screen?
I have it on my GTD.Since i live in Scotland i use it quite a bit from Nov-Feb.As others have said.It (the diesel) takes an eternity to warm up so i knew i had to have it.Shame about the advanced tele prep crap you have to spec with it-but that's how it is with VW. :huh:
Mine is also set to come on automatically when you press the max demist button.I notice it de-ices quicker than it de-mists.I haven't had to switch onto manual heating as yet.Maybe the auto demist function isn't as good as it claims to be?.
I would get VW to check it out.Maybe your heating element is faulty?.
Many thanks. You can check if it comes on with the max demist fuction as it shows up on the convenience w consumers list when it's on. It was fine on my Gti but certainly not ok the R.
I imagine it's a messed up new version of the software.
Convenience consumers list.Not seen that yet.Must read up on my 450 page manual!. :grin:
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Sooooo back to the wondscreen. Nobody else seems to have the heated screen?
I have it on my GTD.Since i live in Scotland i use it quite a bit from Nov-Feb.As others have said.It (the diesel) takes an eternity to warm up so i knew i had to have it.Shame about the advanced tele prep crap you have to spec with it-but that's how it is with VW. :huh:
Mine is also set to come on automatically when you press the max demist button.I notice it de-ices quicker than it de-mists.I haven't had to switch onto manual heating as yet.Maybe the auto demist function isn't as good as it claims to be?.
I would get VW to check it out.Maybe your heating element is faulty?.
Many thanks. You can check if it comes on with the max demist fuction as it shows up on the convenience w consumers list when it's on. It was fine on my Gti but certainly not ok the R.
I imagine it's a messed up new version of the software.
Convenience consumers list.Not seen that yet.Must read up on my 450 page manual!. :grin:
Ha Ha, if you scroll up or down from the mpg / speed menu ising using the arrows on the steering wheel you will find it
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I have a manual Golf R with Climate Windscreen. I also find I have to enable the option for climate windscreen every morning when I want to use it. As far as I know, mine does not come on automatically when I press Max Windscreen
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I have a manual Golf R with Climate Windscreen. I also find I have to enable the option for climate windscreen every morning when I want to use it. As far as I know, mine does not come on automatically when I press Max Windscreen
Many thanks. Its funny they have dropped that function since my 2014 Gti with the windscreen. We still have the tick box for auto screen heating though.
Mine is going into the garage Friday for them to have a look and not know what do as usual lol
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Well I took my car into the dealer for them to have a look. When I went back my confidence was shattered when they said they were worried the car did not have the heated screen fitted, as they could not see the wires in the screen! I guess they need to read up the their own technology. Needless to say they didnt know what was wrong with the auto function and thought they had got it working by manually switching the screen on, tuening off the ingnition, then turning it back on. All that was happening was the 8 minute timer was remembering the activation from before the ingnition was turned on.
I am positive there is an issue with the heated screen, more than likely software related, or possibly a faulty humidity sensor.
As with many 'improvements', for example the stop start function cutting the engine before the car stops moving, and using the radar sensor to restart the engine, VW's modifications tend to be a step backward in reality. I suspect every 2017 model year Golf with a heated windscreen has the same issue as mine, and I am one of the few people that has had the screen on a previous car, and knows how it should work.
Ian
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Had mine on this morning.Car well iced up (apart from the side nearest my house).
Into car,switched on heated rear,mirrors and front screen to full demist.Back out,scraped the drivers window only.
Back in and a couple of wipes of the front screen and we were good to go!.It's that fast!.
I can't recommend the heated front screen highly enough.Especially if you have a diesel and live in the Northern Climates. :grin:
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Had mine on this morning.Car well iced up (apart from the side nearest my house).
Into car,switched on heated rear,mirrors and front screen to full demist.Back out,scraped the drivers window only.
Back in and a couple of wipes of the front screen and we were good to go!.It's that fast!.
I can't recommend the heated front screen highly enough.Especially if you have a diesel and live in the Northern Climates. :grin:
My 2014 Gti was like that, but on my new 2017 MY R the screen heating does not come on when you switch on front screen demist.
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Had mine on this morning.Car well iced up (apart from the side nearest my house).
Into car,switched on heated rear,mirrors and front screen to full demist.Back out,scraped the drivers window only.
Back in and a couple of wipes of the front screen and we were good to go!.It's that fast!.
I can't recommend the heated front screen highly enough.Especially if you have a diesel and live in the Northern Climates. :grin:
My 2014 Gti was like that, but on my new 2017 MY R the screen heating does not come on when you switch on front screen demist.
What i have noticed when it's on Auto heating.If you go into the menu the windscreen heating symbol is not illuminated.Like it says it's not on.When it obviously is.When you press the symbol it illuminates. :huh:
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Had mine on this morning.Car well iced up (apart from the side nearest my house).
Into car,switched on heated rear,mirrors and front screen to full demist.Back out,scraped the drivers window only.
Back in and a couple of wipes of the front screen and we were good to go!.It's that fast!.
I can't recommend the heated front screen highly enough.Especially if you have a diesel and live in the Northern Climates. :grin:
My 2014 Gti was like that, but on my new 2017 MY R the screen heating does not come on when you switch on front screen demist.
What i have noticed when it's on Auto heating.If you go into the menu the windscreen heating symbol is not illuminated.Like it says it's not on.When it obviously is.When you press the symbol it illuminates. :huh:
On my Gti the symbol never lit up when the screen came on automatically or by selecting the screen clear button. Sadly now the only way I can have the screen heating is via the climate setup menu and manually pressing the heated screen symbol on the touch screen.
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Sooooo back to the wondscreen. Nobody else seems to have the heated screen?
I have it on my GTD.Since i live in Scotland i use it quite a bit from Nov-Feb.As others have said.It (the diesel) takes an eternity to warm up so i knew i had to have it.Shame about the advanced tele prep crap you have to spec with it-but that's how it is with VW. :huh:
Mine is also set to come on automatically when you press the max demist button.I notice it de-ices quicker than it de-mists.I haven't had to switch onto manual heating as yet.Maybe the auto demist function isn't as good as it claims to be?.
I would get VW to check it out.Maybe your heating element is faulty?.
Many thanks. You can check if it comes on with the max demist fuction as it shows up on the convenience w consumers list when it's on. It was fine on my Gti but certainly not ok the R.
I imagine it's a messed up new version of the software.
Tried that convenience consumers list thing.It wasn't on the scrolling menu display but now it is!. :nerd:
I have noticed that when you press the max demist(heating) button it only shows as 'air-con' on the consumers list.But if you switch it on manually from the menu it shows as 'heated front screen' and 'air con' :huh:
It's all a bit strange.
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You chaps with GTD's not using the electric supplementary heater to boost your warm air on cold mornings? That comes on when you select a/c on.
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You chaps with GTD's not using the electric supplementary heater to boost your warm air on cold mornings? That comes on when you select a/c on.
Yes got that box ticked on the climate menu.Didn't even know what it did till you told me there!. :embarrassed:
Worth people checking out though.
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You chaps with GTD's not using the electric supplementary heater to boost your warm air on cold mornings? That comes on when you select a/c on.
Yes got that box ticked on the climate menu.Didn't even know what it did till you told me there!. :embarrassed:
Worth people checking out though.
Sadly my dealer is clueless. They didnt even know at the PDI if the screen had been fitted or how to turn it on! I am not sure what on earth the auto function is supposed to do though if the screen never comes on automatically. I will have to go direct to VW with the problem I guess.
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You chaps with GTD's not using the electric supplementary heater to boost your warm air on cold mornings? That comes on when you select a/c on.
Yes got that box ticked on the climate menu.Didn't even know what it did till you told me there!. :embarrassed:
Worth people checking out though.
Sadly my dealer is clueless. They didnt even know at the PDI if the screen had been fitted or how to turn it on! I am not sure what on earth the auto function is supposed to do though if the screen never comes on automatically. I will have to go direct to VW with the problem I guess.
Now i'm beginning to question my sanity!.With this supplementary heater thing,maybe it's that, that is helping my windscreen to de-ice.Maybe i have the same problem as yourself and others.
It would make sense.The heated screen not showing on the consumers list until switched on using the touchscreen.It does de-ice pretty quickly though so it's probably just my imagination.
Next move.Switch on maually then compare to time taken on auto.Then i'll know for sure. :grin:
When my car was in for it's first service in September they mentioned that there were a few non safety related recalls/software upgrades that they couldn't do because of 'an issue with our computer system'.'We will do them next time you're in'. :angry: Maybe the screen is one of them.
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You chaps with GTD's not using the electric supplementary heater to boost your warm air on cold mornings? That comes on when you select a/c on.
Yes got that box ticked on the climate menu.Didn't even know what it did till you told me there!. :embarrassed:
Worth people checking out though.
Sadly my dealer is clueless. They didnt even know at the PDI if the screen had been fitted or how to turn it on! I am not sure what on earth the auto function is supposed to do though if the screen never comes on automatically. I will have to go direct to VW with the problem I guess.
Sadly true.It's like having an extra button on the dash.'What does that one do?','oh,nothing,it's just there for show'.
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Shame they have a policy of removing physical buttons these days - would be so much easier if it was possible to control the screen heating from the centre console like you can with driving modes.
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What annoys me is my 2014 Gti had the same heated screen and it did work totally automatically. In over 2 years of ownership I did not switch it on once manually. It used to sense high humidity in the cabin / temperature differential between outside and inside / if you had pressed the screen demist button on the climate controls, and show up on the econvenience consumers list. I remember how amazing it was when getting in the car with wet hair seeing the screen heating come on of its own accord.
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My May 2016 delivered GTD has exactly the same "issue", in that the Auto switch on setting appears to do nothing.
I still wouldn't be without it though, even if I do have to switch it on manually. Not only does it make defrosting the car pain free (just the side windows to scrape), it means with not having to scrape the windscreen that the screen doesn't scratch as much.
Literally only take a couple of minutes to soften the frost enough that a quick flick wipe completely clears the screen. Wouldn't be without it now - auto function working or not :laugh:
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My May 2016 delivered GTD has exactly the same "issue", in that the Auto switch on setting appears to do nothing.
I still wouldn't be without it though, even if I do have to switch it on manually. Not only does it make defrosting the car pain free (just the side windows to scrape), it means with not having to scrape the windscreen that the screen doesn't scratch as much.
Literally only take a couple of minutes to soften the frost enough that a quick flick wipe completely clears the screen. Wouldn't be without it now - auto function working or not :laugh:
Yes it does work well. Nice to see a similar car has the same issue. If only the max windscreen climate button switched it on, it would be a start lol
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Hi
A quick update. My car was at the dealers today having the issue looked at. They found a mug of boiling water below the sensor which it turns out is in the rear view mirror housing on the windscreen, triggers the auto screen function. It is best to test this with the climate switched off. When the screen activates you hear the alternator load on the engine. Nothing shows up on the convenience consumers though, which must be a software issue. Btw once the screen heating cuts in the steam from the hot water will not steam up the screen, so it proves it's working.
Hopefully a future software upgrade may add the screen activation to the convenience consumers screen.
Ian
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First time i had to switch my heating on manually yesterday (-5) and well iced up.I knew straight away it wasn't doing it's thing.Normally see it within seconds starting at just below the rear view mirror and a little snake of de-icing goodness appearing from the bottom of it.
Along with the (forced to have but never used) advanced telephone prep it has been quite an expensive option.Still love it though. :smiley:
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Hi
A quick update. My car was at the dealers today having the issue looked at. They found a mug of boiling water below the sensor which it turns out is in the rear view mirror housing on the windscreen, triggers the auto screen function. It is best to test this with the climate switched off. When the screen activates you hear the alternator load on the engine. Nothing shows up on the convenience consumers though, which must be a software issue. Btw once the screen heating cuts in the steam from the hot water will not steam up the screen, so it proves it's working.
Hopefully a future software upgrade may add the screen activation to the convenience consumers screen.
Ian
Thanks for the update, so they concluded the auto function was working sufficiently? Sounds fairly useless if so to me to be honest! Mine has also never come on automatically despite being enabled, although i still love the heated screen even if i do have to manually activate it! It'll probably see some use again this week with the snow coming...