Overheating 2015 polo 1.4 tdi bluemotion- 16k

Chat about your 6R/6C model Polos here!
cburgess906
New
Posts: 4
Joined: Mon Feb 20, 2017 8:04 am
Drives: Polo 2015
Location: Manchester

Overheating 2015 polo 1.4 tdi bluemotion- 16k

Post by cburgess906 »

Hi all,

Booked my car in for its first 2 yr aircon service- strangely noticed it was blowing normal air all the time and don't know if it's linked to the bigger issue...

First time was 3 days ago- oil and temperature readings go up to 120 after 15 mins of driving, hover there and then the temperature quickly returns to the usual 90 degrees- any ideas what could be up? Coolant level looks fine, radiator comes on, car seems to drive fine, just concerned if it's doing any damage- car's booked in with vw on 16 June.

Thanks in advance!
joe6
Bronze Member
Posts: 246
Joined: Mon Aug 22, 2016 5:24 pm
Drives: Golf Mk6 GTI (Scirocco gone) Polo 6c GTI
Location: East Midlands

Re: Overheating 2015 polo 1.4 tdi bluemotion- 16k

Post by joe6 »

Try leaving the heater on its highest setting from cold and see if it does it then - the heater takes warm/hot coolant before the engine thermostat opens. If it does not 'overheat' or does not get as hot then the main engine thermostat is a possible fault. Unlikely with your mileage to be an airlock in the system.
RUM4MO
Bling Bling Diamond Member
Posts: 5859
Joined: Sat Dec 30, 2006 9:12 pm
Drives: B8 S4 & 6R/6C1 1.2TSI 110
Location: Mid Lothian

Re: Overheating 2015 polo 1.4 tdi bluemotion- 16k

Post by RUM4MO »

Due to me being on a few VAG forums, ie Audi, VW, SEAT and Skoda, leads me to suggest that there is an overheating issue with the 1.4TDI engines that should be getting reported to your dealer before it does some permanent damage to that engine - have you taken this up with your VW dealer while that car was still within its warranty?

Edit:- it seems that at least Skoda have been having issues with the coolant and pump on this engine, it appears that they are now using another coolant other than the "proper" G13, you should drop this car off and collect a loaner/management car to keep you mobile! Sounds like Skoda UK are sourcing loaner cars to cover this issue and have being doing so since at least March 2017.

Another Edit:- do not expect VW to do the right thing and recall all these cars, they don't need to do that as this is not a safety related issue.
skymera
Getting There!
Posts: 96
Joined: Wed Oct 12, 2016 4:28 pm
Drives: 2016 R-Line TDi
Location: Berks

Re: Overheating 2015 polo 1.4 tdi bluemotion- 16k

Post by skymera »

Interesting. Not had any heat issues with my 2016 1.4 TDi. It's just ticked over to 16k.

I;ll keep an eye on things!
RUM4MO
Bling Bling Diamond Member
Posts: 5859
Joined: Sat Dec 30, 2006 9:12 pm
Drives: B8 S4 & 6R/6C1 1.2TSI 110
Location: Mid Lothian

Re: Overheating 2015 polo 1.4 tdi bluemotion- 16k

Post by RUM4MO »

It sounds like on the 1.4TDI engines, there are two coolant pumps, the main one and an auxiliary one, sounds crazy but the auxiliary one gets driven from the engine and the main one, where ever it gets its drive from, has a electric clutch on it, it is that that is failing due to an incompatibility issue between that main pump inner workings and G13 coolant - I just can't see how this has happened, you could not make that up!

I'd be swinging by the VW dealer and asking what the score is and why your car is not affected, you might get told the truth and that might be that things have been sorted out by the time your car/engine were built. For the record, while Skoda changed coolant type, the "correct" coolant for all these cars remained to be G13, so at least earlier this year, while you could get your car reworked at Skoda, there was none of the replacement coolant available to the general public!!

Maybe just another small slip up like the oil that was initially used in the DSG boxes?

Any product manufacturer can come up against these problems, but it is how they deal with the problem that counts, VW are not too good in offering up any info unless things have become a bit serious it seems!

Edit:- I'm passing on what I've stumbled upon in good faith, some or all of this might be complete b*llocks - but if I had one of these engines, I'd be trying to make sure things were okay now, and for the future.
rory7
New
Posts: 2
Joined: Wed Apr 11, 2018 11:51 pm
Drives: 1.4 POLO SEL TDI
Location: London

Re: Overheating 2015 polo 1.4 tdi bluemotion- 16k

Post by rory7 »

Hi all,

I too have a 2015 polo 1.4 tdi bluemotion, and have experienced very similar issues. See below history:

01/15 Car bought

12/15 Vehicle overheating - water pump replaced.

08/16 Vehicle overheating - water pump replaced.

03/17 Vehicle overheating - no fault found by garage.

05/17 Vehicle overheating - water pump replaced.

01/18 Vehicle overheating - water pump replaced.

03/18 Engine died whilst driving. Failing Turbo, failing no2 cylinder valve.

To be continued...

I'd be very interested to hear if anyone help has had similar experiences - it doesn't seem like its an uncommon problem, however, now that my car is out of warranty, VW is charging £5000 for the repair, despite it being a recurring fault. Be warned...

Rx
Bollarthur666
New
Posts: 1
Joined: Tue Aug 04, 2020 11:48 am
Drives: 14 TDI Bluemotion
Location: Birmingham

Re: Overheating 2015 polo 1.4 tdi bluemotion- 16k

Post by Bollarthur666 »

Hi. My 14TDI overheated Sunday 2nd of August AA thought it was the thermostat. Took it to my garage there was another polo exactly the same in for the same thing. Anyone hear if this is a recall fault to do with the water pump? If anyone knows anything that would be great I’ve got it booked in with VW on the 10th.
Thanks
R.
Zeezee
New
Posts: 4
Joined: Fri Apr 27, 2018 9:37 pm
Drives: 2014 1.4Tdi
Location: Manchester

Re: Overheating 2015 polo 1.4 tdi bluemotion- 16k

Post by Zeezee »

Very common problem reported in the cousin vehicle Skoda Fabia. The 1.4 TDi CUSA/ CUSB has a water pump issue. Did you contact VW ? And what did they say ? I faced similar issues at my vehicle at 18k mileage . Replaced the thermostat but hasn’t resolved the issue. I just put the heater on full blow to get the temp down. Dropped an email to local VW . Skoda are recalling the same engine putting it down to the diverter shield of the main pump sticks intermittently ..hope Vw acknowledges this and replaces the new pumps free of charge
Zeezee
New
Posts: 4
Joined: Fri Apr 27, 2018 9:37 pm
Drives: 2014 1.4Tdi
Location: Manchester

Re: Overheating 2015 polo 1.4 tdi bluemotion- 16k

Post by Zeezee »

Bollarthur666 wrote: Tue Aug 04, 2020 12:05 pm Hi. My 14TDI overheated Sunday 2nd of August AA thought it was the thermostat. Took it to my garage there was another polo exactly the same in for the same thing. Anyone hear if this is a recall fault to do with the water pump? If anyone knows anything that would be great I’ve got it booked in with VW on the 10th.
Thanks
R.
What did VW say?
johnflower
New
Posts: 5
Joined: Fri Aug 09, 2019 8:49 pm
Drives: 1,4 TDI
Location: United Kingdom

Re: Overheating 2015 polo 1.4 tdi bluemotion- 16k

Post by johnflower »

Any idea where we stand on this , my TDI temperature goes up way over 90 down on power can see temperature gauge moving up and down , stop for five minutes all ok , That was on a 20 mile run , it’s not happening all the time , 39000 o clock pump change by previous owner under warranty Thanks
AirDark
New
Posts: 11
Joined: Fri Dec 31, 2021 9:07 am
Drives: 6R TDI BlueMotion 90BHP
Location: Bude

Re: Overheating 2015 polo 1.4 tdi bluemotion- 16k

Post by AirDark »

Hi all of you, thank you for be part of this forum.
my issue is with a Polo 2015 90 bhp diesel bluemotion 1.4L engine cusb, since a few month i noticed that on start and stop system showing error about working temperature not kept, and the temperature tends to go up, after checking on internet about this, seems due to an water pump shield seized, that affecting the water flux inside the engine, as mentioned on the messages above.


in this video is it showed https://www.youtube.com/watch?v=4ukTilxezVw

my question is, is it ok to replace the water pump with new one that hasn't the shield? there are some issues using pump without that shield? thank you very much in advance to all
RUM4MO
Bling Bling Diamond Member
Posts: 5859
Joined: Sat Dec 30, 2006 9:12 pm
Drives: B8 S4 & 6R/6C1 1.2TSI 110
Location: Mid Lothian

Re: Overheating 2015 polo 1.4 tdi bluemotion- 16k

Post by RUM4MO »

I could be wrong, but at least on some VW Group engines that have that arrangement, ie "variable" flow coolant pump, VW Group now only supply a pump without that "variable" facility.

Edit:- I'm guessing that that tech document's source was Skoda as that might explain the green bits on the paper and the fact that it mentions high temperature warning lights - Skoda it seems like SEAT don't tend to go as far as providing coolant temperature gauges to all their cars.

I'd also think that if you get this work done in a VW dealership or VAG Indie workshop, the coolant system will get drained and refilled with G12evo as that is the current coolant now that G13 has been superseded.

I'm unsure if VW Polo TDIs ever got the coolant reservoirs with "MIT SILIKAT" printed on them so probably never got these "tea bags" of Silicate salts, no harm in checking though, there was also a slightly different style of Silicate container that was built into the structure of the reservoir so more secure in terms of letting the Silicate granules get free.
AirDark
New
Posts: 11
Joined: Fri Dec 31, 2021 9:07 am
Drives: 6R TDI BlueMotion 90BHP
Location: Bude

Re: Overheating 2015 polo 1.4 tdi bluemotion- 16k

Post by AirDark »

Ok,
First: thank you for your answer
Second: ok because on some spare parts website there is still as spare part the variable flow coolant pump, and obviously a spare part without that divertor system… ok you mean that the best coolant liquid is G12 evo? Do you know if there is a chance of managing via eobd the solenoid on the original pump? Thank you
Ps happy new year😅
RUM4MO
Bling Bling Diamond Member
Posts: 5859
Joined: Sat Dec 30, 2006 9:12 pm
Drives: B8 S4 & 6R/6C1 1.2TSI 110
Location: Mid Lothian

Re: Overheating 2015 polo 1.4 tdi bluemotion- 16k

Post by RUM4MO »

Happy New Year to you!

The one thing that I can not answer is, how does the solenoid coil survive if refitted to the new "without" diverter shield without any load to operate. From my experiences of solenoids or "mag valves" the one thing that you should never do is operate a solenoid coil while it has been physically separated from the iron plunger that is it is normally located over/on.

It could be that in a VW Group workshop, that power lead is either tied back, or the solenoid coil is refitted to the area it was in the previous version and left to survive without an iron load, or it is refitted to the area it was in the previous version and the engine controller coding changed to delete it, ie never operate it. Now it could be that there is someone out there with more knowledge about these coils than me - or maybe the "coil" assembly includes a ferro magnetic blob that provides the "pull" for the linkage and that "coil" will live as long as normal without having a load to "pull" - maybe just too much information and not relevant here, but I have felt I had to inform you about this before you moved forward on this repair - at this point, that guy on youtube, who I believe to be a very trustworthy "helper" has not mentioned anything about that and has just suggested doing as he did which was to refit the coil to the revised version of this pump and reconnect the wire. If the tech doc from Skoda(?) has not referred to any other actions being necessary, then maybe I'm wrong - and I'd think that all VW Group engines that use this sort of active shield on the main water pump, will be using the exact same set up, so if any other action was needed, it would be needed for any TDI engine with this controlled engine driven coolant pump.

It would be very handy for others if someone could jump in and close this doubt down now one way or the other.
AirDark
New
Posts: 11
Joined: Fri Dec 31, 2021 9:07 am
Drives: 6R TDI BlueMotion 90BHP
Location: Bude

Re: Overheating 2015 polo 1.4 tdi bluemotion- 16k

Post by AirDark »

hi, thank you for the info, please, try to check here.... seems that with a VCDS work it could to exclude the solenoid that is piloting the diverter to open and close, to put to deactivated, or other solution to put a 1k ohm resistor to trick the ecu (avoiding to have engine check light on the dashboard....

sorry forgot the link
https://forums.ross-tech.com/index.php?threads/20417/
Post Reply