Coolant leak - Culprit is the Coolant inlet valve seal

**folkwagen** · 08-08-2022,07:45 PM

I've not seen that one for years, it may be superceded. There's no definitive source of Audi TSB that's easily searchable. This is the largest source I've found, but it's a trawl to go through every page for every model and year using 'find in page' using 'coolant or 'leak. TSB numbers seem to make no sense, or are in any particular alphanumeric order.

AUDI A6 Factory Technical Service Bulletin - TSB | AutoCodes.com
Edit. That TSB couldn't be found January 2020, it may never have been published on a web site. An earlier poster refers to ' internal Audi TPI', which was probably an audi state secret, only available on the audi service system. Those other TSBs describe the exact condition, if not the correct range of cars to which it applies. Read the earlier posts re warranty refusals, where they contend that the failure was a long developing natural wear and tear issue, not a design disaster waiting to happen. The work on my car is unrecorded on the Audi service record for the car. No parts, labour, work descriptions. Very fishy

**Crasher** · 09-08-2022,09:57 AM

Originally Posted by folkwagen

There's no definitive source of Audi TSB that's easily searchable.

https://erwin.audi.com/erwin/showHome.do

**driverboy** · 09-08-2022,10:08 AM

Absolutely I was thinking the same yesterday after I seen some of the comments.
Thank you again

**folkwagen** · 09-08-2022,11:11 AM

https://erwin.audi.com/erwin/showHome.do

You wouldn't have a generic username and password for that ERWIN server by any chance?

**Crasher** · 09-08-2022,01:04 PM

You create your own account.

**folkwagen** · 09-08-2022,02:16 PM

What does it cost to use, by time or by document? Audi wanted €100 off me just to use their scanner to see if there were any codes relating to the leak (there weren't as I already knew). Said using the scanner wasn't covered under extended warranty! Talk about trying it on. They obviously were talking about fees for looking up TSBs or service procedures. I refused, I sent them the TSB. A big main dealers, they must have had some of these failures in by then, Jan 2020.

**Crasher** · 09-08-2022,02:38 PM

It costs €7 an hour to access the dealer level system ELSA PRO and all the TSB's relating to the VIN entered in what we call the "Red Book". There can never be codes relating to the valve itself as it is vacuum operated and has no feedback.

**folkwagen** · 09-08-2022,02:50 PM

The valve that caused the TCU failures was electrical, coolant got out from the valve body via the electrical pins, leaking into the loose fitting cable shroud, hopefully out onto the bottom cover, but in many cases it continued on up the inside of the shroud to the main loom, and from there into the TCU multipin connector, ruining this and even the TCU board itself. Thousands of bucks. It may also have wicked to other controllers and caused havoc. If the loom shrouds were well sealed at the connector collars, you might be hard set to find a drip, as all the coolant was inside the loom and oozing out into critical sealed electrical components. By the time you got codes, you were in big trouble. A few posters on other blogs managed to salvage the situation without losing their Transmission CU.