Failed Thermostat Housing/Coolant Loss Info Gathering

[ReadTheBook]

Dunno why I’m a glutton for punishment but back in May ‘23 we got a 2019 Spektrum R with 20k miles on it, our 5th MK7 since 2014, and guess what I smell and see going away from the tank at 25k miles.

Big sigh. At least we have the 6/72 warranty until 2025, maybe I can get two or three replacements in on it before the warranty runs out ??

 

[MSchott]

Maybe I’m lucky but the replacement housing installed at about 48,000 miles has been leak free. I’m now at 141,000 miles. Did they change the design?

 

[avenali312]

Maybe I’m lucky but the replacement housing installed at about 48,000 miles has been leak free. I’m now at 141,000 miles. Did they change the design?

I hope my experience is like yours. I had mine replaced at 38,700 about 4 years ago and it has been problem free since then (knock on wood). But I only have about 73k on it now, so not enough miles to tell haha.

 

[ReadTheBook]

Maybe I’m lucky but the replacement housing installed at about 48,000 miles has been leak free. I’m now at 141,000 miles. Did they change the design?

There have been various revisions to the part over the MK7/7.5 product lifecycle.

The latest mk7.5 part (and I’d assume mk7 as well) looks to be 06L121111P.

 

[avenali312]

There have been various revisions to the part over the MK7/7.5 product lifecycle.

The latest mk7.5 part (and I’d assume mk7 as well) looks to be 06L121111P.

Seems about right. Mine was replaced in 2019 and is an M revision.

 

[ReadTheBook]

Seems about right. Mine was replaced in 2019 and is an M revision.

Yeah, last time I had one done was when they replaced my 2017 Sport’s motor under warranty December 2020, it was still the M revision.

Three more revs since then it would seem.

 

[YamR1rider]

Maybe I’m lucky but the replacement housing installed at about 48,000 miles has been leak free. I’m now at 141,000 miles. Did they change the design?

I feel there's definitely an element of luck involved regardless of revision. Changed out the one on my daughter's 2015 car at 145k miles earlier this year - it was the original part with a 2014 date stamp. And it wasn't even leaking....reason for the change was the thermostat was starting to play by up throwing false overheating readings.

 

[ReadTheBook]

I feel there's definitely an element of luck involved regardless of revision. Changed out the one on my daughter's 2015 car at 145k miles earlier this year - it was the original part with a 2014 date stamp. And it wasn't even leaking....reason for the change was the thermostat was starting to play by up throwing false overheating readings.

Truly remarkable.

My friend was actually just texting me about his 2018 Tiguan. 130k on it and just needed to be done. Started pushing coolant out through the electrical connection according to the tech who worked on it.

 

[johng.wissig]

My 2015 weeped slightly for some time then at 96k it emptied the overflow in 300 miles. Pump and housing replaced in Sept. Now I never smell antifreeze! Been smelling it since 30k but level dropped very sloooowly.

 

[Tacomonster]

22k and mines leaking now. I guess I’m part of this club

 

[JerseyMike]

Had the H2O pump/thermostat housing replaced at 46k after noticing a leak.

Just dropped off at the local dealer for the suction jet pump recall with 61k on the clock and they noticed another coolant leak. Only lasted 15k. At least it's under warranty.

 

[ecsta]

My first 2017 had it replaced at 40,000km and 90,000km. bought a 2016 and it had replaced at 55,000km and its been fine since. Seems to be a lot of luck involved.

 

[Parabola]

My 2015 is at ~60k miles and on original water pump. I typically add coolant once a year, at some point I am expecting it to go, but curious how far can I make it…

 

[ecsta]

My 2015 is at ~60k miles and on original water pump. I typically add coolant once a year, at some point I am expecting it to go, but curious how far can I make it…

Might as well wait until you need to do carbon cleaning. When they do the cleaning they take apart a lot of whats needed to swap it out, I saved a bunch of labour doing both at the same time.

 

[Ridebjj]

I've got 87k and still original pump.

I have had to add about half the volume of the reservoir in water to the system over the years as the level has dropped. So if it is leaking it is very slow.

I have not looked very closely though. However, once the weather here cools down in a few weeks, the car is going up for a prolonged period to get a bunch of things done to it. It's too hot still both to work on it and to go everywhere by motorcycle while it's in progress.

New clutch, new front fender, new tranny and diff fluids and probably will pull the intake manifold to do carbon cleaning. I'll inspect the pump area then and if it needs replacing that will be the time.