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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKVII-Mk7 Golf family including Golf Wagon (~ 2015 +)

VW MKVII-Mk7 Golf family including Golf Wagon (~ 2015 +) Discussions area for the Mk7 (2015+) Golf and Golf Wagon TDIs based on the MQB (Modularer Querbaukasten) platform.

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Old February 11th, 2019, 06:40   #16
bigb
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Sorry no help here but has anyone noticed all these cars are from the general areas of England, Spain and Australia?
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Old April 2nd, 2019, 12:06   #17
MihaK
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Mine was imported from Germany ...
My latest diagnosis is that right after regeneration, the EGR valve opens (if you are driving it under light load or lift the accelerator pedal - during regen is allways shut) and blows very hot air from after DPF into EGR cooler. There it boils because of insufficient/restricted water flow trough heater matrix which is right after EGR cooler.
I read somewhere that early 2013 models had too thin pipes in heater matrix and it could be easily partially clogged. Later models have updated version of matrix.
I didn't have balls to change the heater matrix yet, though.
Last time my car was doing active regen, I heard the start of hissing air trough heater matrix and I imediately put in into S mode - with higher revs it stopped (probably EGR closed) and no coolant came from expansion bottle.
Can anyone back that same symptoms/diagnosis?
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Old April 4th, 2019, 07:04   #18
r90sKirk
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Have not heard of this issue yet on a MK7, but the symptoms the OP has experienced would lead to a leaking Head Gasket on most of the earlier TDI engines.

The coolant reservoir will get over pressurized from the exhaust gases getting into the coolant passages, and will puke coolant out the reservoir when shut down, and will cause inconsistent heat issues in the cabin - think of "air entraining" in the coolant.
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Old April 12th, 2019, 00:50   #19
Jason11
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Hello! I am currently having this issue with my 2014 Audi A3....no leaks anywhere else other than over pressurising and coming out of the coolant reservoir.

It sometimes happens every week or 2 but then sometimes it will do it every day for a while, more after harder drives and motorway driving.

I have had the car in at 3 garages, headgasket test done and none can find the issue! I have no other running issues, oil and coolant temps stay normal and the heater works perfectly all of the time.

Anybody solved theirs yet??


Thanks!!
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Old June 18th, 2019, 02:20   #20
Candellara
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Hi All,

Have this exact problem (which started as no heat from vents) in my wife's 2013 Golf 7 TDI

I think this maybe all interconnected with the silicant in the expansion tack / heater matrix blocked issue?

Ours started 6 months ago with no heat from vents and a gurgling noise behind the dash area (matrix?). Inlet pipe to matrix was hot and outlet cold. Booked it into VW - they said it's a very common problem and recommended new expansion tank and new matrix (£819). I took the car away as i wasn't convinced

I disconnected heater matrix pipes and flushed with a hose (you can only flush 1 way on this matrix due to the design). Water was flowing freely through the matrix and coolant was clean. Reconnected and topped up the coolant - and nice warm air from the vents. The car was fine for six months until the weekend just gone. Long motorway drive and at idle could hear the gurgling noise from dash area and no heat from the interior vents.

Outside the car, their was water being omitted from the expansion tank. (Note throughout all of this from the start - the car only reads 90 temp and the computer was scanned for fault codes / interior heating flaps checked and all is ok)

So, have changed the reservoir and expansion tank cap, refilled with G13 coolant. I thought about flushing the matrix again just incase the system got contaminated with the silicant bag from the old expansion but both heater pipes are nice and hot, heat from vents and car is bag to normal again

There are dozens of threads regarding this issue all over the forums. Has anyone had a permanent fix and a definitive diagnosis?
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Old June 18th, 2019, 16:06   #21
thundershorts
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As long as VW keeps using plastic impellers on their water pumps, the impellers will continue to spin on the shafts. I'd consider it your possible problem.
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Old June 19th, 2019, 09:41   #22
Candellara
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Quote:
Originally Posted by thundershorts View Post
As long as VW keeps using plastic impellers on their water pumps, the impellers will continue to spin on the shafts. I'd consider it your possible problem.
Interesting - seems logical but would you not see an increase in coolant temp?
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Old June 20th, 2019, 07:08   #23
Candellara
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Quote:
Originally Posted by thundershorts View Post
As long as VW keeps using plastic impellers on their water pumps, the impellers will continue to spin on the shafts. I'd consider it your possible problem.
I think you may be right. It's definitely not the silicant issue.

As stated, 6 months ago (during a motorway drive) we lost heat to the vents and we had gurgling noises from the dash. The car was subsequently booked into VW and their diagnosis was that there are no fault codes present but what is common on MK7 Golfs was that the silica bag in the water expansion tank ruptures and blocks the heater matrix. Price to rectify £819 for new matrix.

I didn't believe them and was a bit miffed that they hadn't tried to flush the system so i took the car away. I disconnected the hoses from the matrix at home and flushed with a hose and water was flowing freely. Upon reconnecting & top up, heat from the vents again!! The car only does local town driving and everything has been well for 6 months UNTIL, a recent motorway drive. Same symptoms, no heat from vents, gurgling noise and some water being forced from expansion tank on this occasion.

After returning home, i ordered a new expansion bottle & cap - very low cost and really to eradicate these items from being any cause. After fitting and checking, we have heat again from the vents.

Well, today i opened up the old expansion tank with a saw - and, the silicant bag is not ruptured and is fully intact with all of it's crystals!!!!! Now this is becoming farcical as the amount of threads there are all over the forums about this exact problem and VW continuing to replace heater matrix's. One poor lady has had 3 heater matrix's as the VW dealer insists that the silicant granules have contaminated the system and continue to block the new heater matrix's. Indeed my local VW dealer wanted to relieve me of £819 for replacing the matrix - when we know the matrix isn't blocked.

Any thoughts?
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Old July 15th, 2019, 07:11   #24
DrSchultze
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Been having the exact same problem with my A3 from 2013.
I quickly gave up flushing the heater core, because there is absoutely no space where the hoses enters the firewall, so this weekend I pulled the heater core, and confirmed that it was indeed clogged up with gunk.
I then made a futile attempt at cleaning out the gunk, and then decided to just order a new core, which is in the mail now.


Before coming to the conclusion that the heater core was the problem, I had some test drives, graphing coolant and oil temperature with VCDS, to confirm that thermostat and water pump was working. Moreover the heating as recently disapeared in the driver side, and isn't particular intense in the passenger side.


Also last time it emptied the expansion tank, I could confirm in VCDS that it had just performed DPF regeneration.


Pulling the heater core on my car wasn't that dificult, it's a question of removing the center consle, the cover below the steering wheel and the glovebox, then the core can be pulled out. All in all 1 hour, if you know how to do it. I expect approx the same for assembly.



I would be suprised if it was more complicated on a Golf 7, so£819 sounds like a lot.
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Old July 16th, 2019, 12:37   #25
AdrianC
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Good evening all..

Glad to know I am not alone with the coolant overflow issue (2014 Golf 7 GTD) 84K Miles.

So just to get you all up to speed;
Just started happening to me over a month ago.
Have had the car a year now with pain free driving and no problems.
Presenting all the symptoms as you guys have already stated.

First time this happened was on long motorway journey, coolant light came on.. Checked Expansion tank and level was below minimum.

Thought nothing of it, topped up and carried on.
No problem.
Checked coolant again once i reached home on the return journey - all normal.

Then on a short run, lost all coolant from the expansion tank.

Booked in my in my local independent garage - said the tank was cracked.
Replaced tank (and not the lid) and I am unsure if the system was correctly bled.

Another long journey and again, Could hearing thumping from behind the firewall. Pulled in, Switched off engine, Got out, popped the bonnet and was met with a little steam so i opened the lid on the expansion bottle to release the pressure and coolant started pouring out the overflow at the bottom of the expansion tank..
Took a video of this as it was happening..
Frustration.

So i went to my local VW Dealer and they have had it 3 week now for testing.
Coolant loss happened once.
They bled the system and after a lengthy pressure test (turned up nothing) and
Conclusion: The Expansion Tank Cap.
Ruled out Head Gasket.
No visible sign of leaks around thermostat or water pump.

I've since purchased sniff tester to detect any combustion gasses seeping into the coolant (should arrive tomorrow).
I will add that there is no mixing of oil/water or water/oil.
Temperature gauge does not rise above 90 Deg C and Oil temp is consistent between 90-100 Degrees C.
No heating issues from the Climatic Control on the dash vents.

It seems all too familiar with you guys who have posted previously.

Still no answer.
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Old July 18th, 2019, 06:20   #26
DrSchultze
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Forgot to mention that the car has 112000km on the clock, and first time I noticed the problem was ~6000km ago. In the beginning I didn't have any issues with the heating, they started to really show up ~2000km ago.

I fitted the new heater core yesterday, it took approx 1½ hours, and it turns out that it was unnecessary to remove the glovebox to get the center console out. But on a RHD you'd need to remove it to access the heater core.

Now I just need to wait for a DPF regeneration to happen.

It still test positive for exhaust in the coolant, so mabe the EGR cooler has been damaged by overheating I doubt that the head gasket has failed, as the temperature gauge has never been above 90, and the boilout has only been happening during DPF regen.

So if the new heater core fixes the problem and it doesn't loose coolant, I may just choose to pretend that I never tested for exhaust in the coolant, but I'm eagerly waiting to hear how Adrian's test turns out.

I also did some more troubbleshooting on Google, and found this unlucky fella, who has been in the hands of the stealership: https://www.justanswer.co.uk/volkswa...-gt-owned.html

I also find the thermal management section of this article quite interesting: https://www.greencarcongress.com/201...322-ea288.html
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Old July 19th, 2019, 00:38   #27
Spipa
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Hi everyone,

I’ve been following this thread for a while now. My 2013 GTD has exactly the same problems as described. Multiple mechanics have not been able to find a solution for my problems. Learned to accept that I just have to fill it up with coolant once a month. Hope that we’ll find a fix for this.
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Old July 22nd, 2019, 12:44   #28
AdrianC
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Evening all,

Just carried out the sniff test and, as predicted, the result was negative/Invalid.
The liquid should have changed from blue to yellow but took a time to change to green.
This sniff test apparatus has 99.9% accuracy apparently...
So, as a precaution I will test again tomorrow to make sure.

If indeed it was a head gasket then the coolant would boil every time the engine is running and should be overheating..
Also, signs of oil in the coolant or coolant in the oil would clearly indicate a head gasket failure. This is not the case.

I think you may be pointing in the right Direction DrSchultze, I am going to focus now on the EGR Cooler and/or EGR Valve Exhanger for possible hole where air is being drawn for DPF Regeneration..
The Coolant overflow is consistent with DFP Regeneration so I am going to check this out.

I will keep you all updated..

WE CAN GET TO THE BOTTOM OF THIS...
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Old July 23rd, 2019, 02:38   #29
DrSchultze
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So.. just had a active regen happen this morning, without any drama whatsoever No thumbing noises and no loss of coolant, if I hadn't had VCDS running, I would never have noticed. I'll post a graph later showing the temps.


So issue seems so far, to have been fixed with a new heater core, the new core I bought wasn't original, and had substantially larger channels.


So the big question is what will be the next thing go clog up in the cooling system.. Apparently EGR, DSG and Oil cooler, all have tiny channels on the MQB platform.


As for the sniff test, arcording to the manual that went with mine, it states that diesel makes it turn green, and gasoline yellow, in case of a leak.
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Old July 23rd, 2019, 11:11   #30
AdrianC
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Just carried out the test again.

Same Result: A light green colour after a few minutes.

According to the manual the fluid should turn yellow for Petrol, Diesel and LPG..
Green means an Invalid test..
Conflicting statements then say green for diesel = combustion gases present.

DrSchultze: Did you do the same sniff test and what was the result??

It'll now give me an idea where to focus my time and money!!
EGR Valve Excanger and/or heater core..
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