Can anyone tell me how you can check to see if your charge or egr cooler is leaking internally.  Ive removed a couple of the sensors to see if I can get my scope inside but the holes are to small . I loose about 300ml of coolant every 500 miles ish . Been like it 12 months fed up of topping it up now 2018 vrs tdi dsg

I'd be interested in knowing too! as I've got a similar problem! 63 Plate SE with a DSG

 

My local dealership investigated, they pressurised the system (no pressure problems) said the it might need a Flush and new bottle (at a cost of £1000) an even said (because I balked at this) that the Heating might not work properly! Which it does (after calibrating the ducts)

 

But after 500 to 750 miles (sometimes even longer) I need to top up the bottle... well to the line.

Same issue. I believe you can get a borescope into the charge cooler, I can't track down the post RN though.

 

 

Do a search, there’s been at least one case of a cracked head that passed the cold pressure test but would use coolant when the engine was hot and running.

2 hours ago, Leodis41 said:

Do a search, there’s been at least one case of a cracked head that passed the cold pressure test but would use coolant when the engine was hot and running.

This was my issue. Have a read of the various threads, ended up replacing my cylinder head. Dealers were absolutely useless in diagnosing...

Did you solve this yet @stig1?

 

My experience is here: 

 

Albeit mine is a 2019 Tsi, i had a leaking thermostat housing, would slowly lose coolant and i had to keep on topping it up, are you experiencing worse fuel economy? i'd maybe get that checked see if its an issue as mine passed pressure checks