Seat Leon St 5F DSG -184PS CUNA Kühlwasser-Mysterium | Posts 24+

"Significant pressure loss in the intercooler."
"Video attached, and the noise is clearly audible. For the video, I've added a compressor (pressure reducer at 1.8 bar) so that the hissing sound can be heard for a sufficient duration."

Update:

LLK severely leaking - losing 0.5 bar of pressure in 3 minutes in the COLD state.

AGR cooler, no pressure loss after 6 hours.
Indoor heat exchanger, no pressure loss after 6 hours.
+ Full heat output from every nozzle
+ Very good flow rate
+ No dirt particles (I rinsed it for 2 hours this morning using an Eheim 1250 with a pre-filter).

Conclusion:
Install the new LLK (likely referring to a liquid cooling component) and then pressure test the entire system overnight.
Then, completely refill with vacuum + x venting routine.

Ideally, I'll have news for you here in the forum on Sunday, but if not, you can read about it in the Sunday newspaper.
"Naked protester demonstrates against Euro 6 diesel technology on a Lanz tractor in Wolfsburg."



Best regards,

Good news!
No nude protests on a Lanz show.
The sight will be spared from you .

No more pressure in the cooling system.
Since this whole issue is probably quite common.
I'm going to write a travel guide during my vacation.

Pressure in the cooling system: what to do.

To avoid being scammed during a trade-in and being ripped off by workshops.

Many people are unaware of the ventilation routine or operation of cooling systems, such as those found in older Volkswagen Golf models.

I would like to thank everyone for their effort and help!

Best regards,
Olli.

Actually, it's not that complicated; the venting procedure is clearly defined.
The realization that the pressure in the cooling system continued to increase after your engine overhaul came a bit late and unexpectedly. Initially, you yourself had tested the intercooler and found it to be leak-free. And speaking of ***, you were already involved in swapping, weren't you...?
hg
Herbert.

Hello Herbert,

Yes, but someone like me has to look those up on Google first. They're not really integrated into VCDS; it only includes the individual tests.
Similarly, I only found information in American forums stating that a value of 4 must be entered during the bleeding of the low-pressure circuit, and that the engine must be off during this process.
It would be great if we could find this information somewhere in a German forum.

You mostly only find small pieces of information, one thread at a time.
There can be various causes, and you might not even think of them right away.
While Erwin (siehe Fehlerdatenbank) offers some information, not everyone has access to all the VW-specific tools, and even then, you can't definitively say "yes, that's the part" without disassembling it and taking a closer look.
I think this will be helpful to the average user.

Yes, that was a really strange thing.
Initially, I also pressure-tested the entire system, and there were no leaks, possibly due to the sealant used on the cooler.
Who knows.

Best regards,
Olli.

@
Just a little thought...
I once had a "new" defective ZK (it was missing a hole).

However, I was able to vent.
But it also had steam bubble formation when warming up!

Okay, another status update.
Faulty LLK replaced - problem solved.

Another problem is still the error code P0011 - camshaft timing not achieved, bank 1, intake.

I still have the old camshaft adjuster housing and the valve.

I just ordered a control valve with part number 03l 906 455C.
"I would like to order a housing with part number 03l109096B and have it installed."
The valve simply doesn't fit; it can't even pass through the adjuster itself. Do I need to replace this one too?
The new valve is slightly thicker, which is why it doesn't fit through the opening in the adjuster.

I hope someone knows more.

I've now reinstalled the old part, and cleaned it thoroughly beforehand, but the problem unfortunately persists, even though the valve is completely unobstructed.
Sure, here's the translation:

"Best regards," or "Sincerely,"

Hello guys.

I'm new here and wanted to share my diagnosis after searching for a long time and checking everything possible, including replacing the cylinder head (the old head had a crack between the valves), and still having pressure in the cooling system. In my case, the AGR cooler (still the first generation, with part number 04L 131 512L) was leaking.

I replaced it with a new generation part (04L 132 512 BQ).