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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 September 21st, 2019, 11:16   #166
mm-rocco
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Quote:
Originally Posted by Spipa View Post
I just replaced the heater core also, the heating works now perfect again. Only time will tell if the blow outs wonít happen again to my car.

How severe is your coolant loss after replacing the heater core?

@Spipa Good to hear that you replaced the heater core ! The coolant loss is about 1 liter per 1000km, that is a rough calculation. The blown outs are gone so i suspect that i had two (or more ) faulty parts.
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Old September 21st, 2019, 11:42   #167
Spipa
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Quote:
Originally Posted by mm-rocco View Post
@Spipa Good to hear that you replaced the heater core ! The coolant loss is about 1 liter per 1000km, that is a rough calculation. The blown outs are gone so i suspect that i had two (or more ) faulty parts.
Oh that is a lot. How much did you lose before replacing the heater core? Because I had to refill with only 300/400ml after every blow out (about 1000km). I have to say that before my head gasket was replaced, I had to refill with about 1 liter every blow out, so maybe it is indeed a combination of both.
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Old September 21st, 2019, 11:51   #168
mm-rocco
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I have a DPF every 300-350 km, the loss of coolant this time is not related to DPF. It looks like the care is using the coolant this time. How much did you pay for the repair of the head gasket ??
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Old September 21st, 2019, 12:02   #169
Spipa
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Quote:
Originally Posted by mm-rocco View Post
I have a DPF every 300-350 km, the loss of coolant this time is not related to DPF. It looks like the care is using the coolant this time. How much did you pay for the repair of the head gasket ??
It cost me Ä1630 to replace the head gasket and water pump and they also had to fix the cilinder head, but I didnít take it to a vw dealer since they quoted me more than double that price.
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Old September 21st, 2019, 12:32   #170
mm-rocco
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Quote:
Originally Posted by Spipa View Post
It cost me Ä1630 to replace the head gasket and water pump and they also had to fix the cilinder head, but I didnít take it to a vw dealer since they quoted me more than double that price.

Thanks ! That is serious money !
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Old September 21st, 2019, 20:50   #171
BirdmanofTas
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Quote:
Originally Posted by mm-rocco View Post
I have a DPF every 300-350 km, the loss of coolant this time is not related to DPF. It looks like the care is using the coolant this time. How much did you pay for the repair of the head gasket ??
Hi @mm-rocco sorry to hear your still having issues.. i would get your coolant checked for exhaust gases before going in to repairs.. if head gasket or egr cooler are faulty you will have detectable exhaust gas in your coolant.. if you dont, it could be mechanical or electrical coolant pump, or thermostat. but get the coolant checked first..
if you do have gases in he coolant, bypass the egr cooler as a first step and test the car before going straight into the head gasket.
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Old September 29th, 2019, 03:13   #172
AdrianC
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Just an update guys.

I've done 600 miles approx (1000km) and absolutely no loss of coolant since i changed the heater core.
This mileage was done with a good bit of spirited driving through motorways and single carriageway - with a few regens in between.


Had a standing regeneration yesterday while i was at the supermarket and everything is good.
No Blowout.
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Old October 1st, 2019, 04:39   #173
Adyzds
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Haven't replaced the heater core yet.
But I drove it 2-3k km and I was checking the DPF regeneration and afterwars I turned the heat to HI.

Result: not a single drop of coolant lost
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Old October 7th, 2019, 05:52   #174
Kennyboy993
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Hi guys - newbie here to the forum though certainly not to golf ownership.

I was hoping you could help me.

Recently acquired 2014 golf mk7 tdi and Iím having coolant loss problems which seem exactly like the symptoms described on here.

Car can go a long journey no problems and then suddenly - perhaps 2nd or 3rd long journey Iíll return to the car in the morning with large coolant loss. Down to a couple of mm visible in expansion bottle.

Iíve had the system checked and thereís no leaks - when it happens it leaves coolant in and around the area of the expansion bottle so Iím convinced itís coming out of the lid under pressure somehow.

Iím 85% certain itís only happening when my car does this regeneration cycle you speak of.

Can you tell me how I can force a regeneration cycle so I can advise my garage?

Also - my heating seems to work perfectly in both heat and AC cold, does this not prove my matrix is working ok?

Any advice gratefully received - Iíve just chopped in my lease for a car that I convinced myself would save us money and still be like a clockwork orange


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Old October 7th, 2019, 15:31   #175
SkilledMilk
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If you have all the symptoms mentioned, but it only loses coolant periodically and there's no mixing of oil and water etc then I think your problem is the matrix. My heater worked but was nowhere near as hot on 'HI' as another equivalent perol Leon in the family. After the change (~1200 miles ago) I've not lost any coolant and my heater is far hotter.

You could have the garage check for combustion gases in the coolant reservoir which would hopefully discount any head gasket issues. Myself and others in this thread have found that for whatever reason a standing/forced regen (not iniitated when driving) doesn't result in overflow of coolant, which is rather unhelpful for diagnosis!
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Old October 7th, 2019, 17:08   #176
nathanso
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Has anyone here with this problem inspected the silicate pouch in their coolant overflow reservoir to see if it has torn/leaked? This thead https://www.pistonheads.com/gassing/...&t=1780683&i=0 and other theads here on tdiclub make mention of this being a prime suspect in clogged heater matrices.
I proactively replaced my car's reservoir as described here http://forums.tdiclub.com/showthread.php?t=501125 Surprisingly, the reservoir costs only around $10 and it can be swapped out in under an hour with the help of a turkey baster to empty the coolant.
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Old October 7th, 2019, 22:52   #177
Kennyboy993
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Quote:
Originally Posted by SkilledMilk View Post
If you have all the symptoms mentioned, but it only loses coolant periodically and there's no mixing of oil and water etc then I think your problem is the matrix. My heater worked but was nowhere near as hot on 'HI' as another equivalent perol Leon in the family. After the change (~1200 miles ago) I've not lost any coolant and my heater is far hotter.

You could have the garage check for combustion gases in the coolant reservoir which would hopefully discount any head gasket issues. Myself and others in this thread have found that for whatever reason a standing/forced regen (not iniitated when driving) doesn't result in overflow of coolant, which is rather unhelpful for diagnosis!


Ok cheers - Iíll recheck heater power on full blast.

I also need to do more testing then as Iím assuming my coolant loss is happening after the engine has been switched off.

I did 2 identical trips, the first didnít lose any, the second lost almost entire expansion vessel - only thing is the time I realised was the next morning when I came back to the car. Annoyingly it as the only trip I didnít check the car immediately after the trip - however coolant low warning light wasnít on though was in the morning.


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Old October 8th, 2019, 06:26   #178
DrSchultze
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Remember to check all the vents, the heat seem to go bad in the left side before the right side.

When I had the problem, the coolant level didn't always drop immediately after a blowout, but instead waited until things cooled down, and coolant was sucked back into the system.
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Old October 8th, 2019, 07:31   #179
Theo95
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Hi guys,

I also changed my heater matrix and after 2 regens I can confirm that the issue is solved, I had no blowouts. This felt like a never ending nightmare. Thank you!
The bottom of the expansion tank just gets a little bit wet to the touch, but I think that's normal due to condensation and high pressure.

What do you think, if the heater matrix got clogged up, wouldn't the main coolant radiator also be partially clogged? Is any of you suspecting something else than the silica bag to be the root cause for this?

@Kennyboy993 With forced regenerations my car was not blowing out coolant. Maybe it needs to do the full cycle. Before changing the heater matrix my car was blowing cooler air on the right side. I used a VCDS and I saw that on the right side there were 45įC and on the left side there were 55įC. I haven't checked the values since, but now I don't feel any difference in temperature.
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Old October 8th, 2019, 12:48   #180
Kennyboy993
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Ah ok thanks guys - that would explain why I canít find any coolant loss after a journey, only the next morning...... mine must be happening on cool down also.

Tried my heating on full blast today - it couldnít get above 49 degrees blowing out when specialist used a temperature torch type device.

Vw specialist is quoting me for new matrix tomorrow- is going to be painful


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