Hey guys. Hopefully someone here can help me out with an issue. ..
I have a 2005 2.0tdi A3 sportback.

For some reason there seems to be a lot of air I the expansion bottle after a run. When opening the cap and releasing the pressure, the water returns to the right level.

I uave replaced the expansion bottle and the thermostat, but after 100miles or so, the low coolant level light comes on. Then I have to release the pressure, and its all good for a bit...

There seems to be K-seal in the coolant as well.
Any help would be greatly appreciated