Long story short. I replaced a coolant hose that was leaking, lost lots of coolant, so I refilled as I have done with every other car.

Appears I have trapped air in the cooling system I can't expel.

Temps running weird, coolant fans on at 60c, etc...

Local garage have had the car a week and are dragging their heals, I need this car back!

Anyone in the Manchester area with diagnostics could purge this system - I'll pay - just need it sorting asap!!

Thanks in advance.

In theory, the car should gradually "burp" itself, but I agree that there is an official way that you need to do either with an ODBEleven or VCDS system to expunge the coolant system.

A quick google shows there are about 5 or 6 VAG specialists in/around Manchester; Autodeutsch, VAG Technik look as good as anything else. Give one of those a call. Otherwise, go have a look at the VCDS area on Briskoda and find a local member who is close to you or you can go purchase a ODBEleven dongle yourself and purge the system yourself.

https://www.briskoda.net/forums/forum/23-diagnostics-amp-vcds/

So, the garage are having issues bleeding the system via software.

Fans are coming on early and the system isn't getting to temp, they have suggested a coolant pressure test...

Anyone any ideas what could be going on here? It's been scanned but it doesn't throw anything up.

I literally changed a leaky pipe, but lost a lot of coolant in the process - I refilled as I thought correctly, bit obviously not.

They've had the car a week and I really need it back.

If it has failed to do a purge, then it would have failed for a reason (reason code). We really need to see an output from VCDS/ODBEleven to comment further.

Assuming you refilled the coolant back up to maximum in the coolant tank with G12evo and that the silica bag has been removed (and hasn't split - one other reason for overpressurisation).

Sounds like your coolant system is become overly pressurised. Things to consider: do a gas/exhaust gas test on the coolant bottle (to make sure your cylinder head gasket hasn't failed) and that the thermostat hasn't failed closed.