Hi,
I had the low coolant light come on when I started the car at lunchtime today. When I checked the expansion tank was almost empty! I called VW assist, who sent the AA to check things out. They refilled the tank and did a pressure check which showed no sign of a leak. My car is in for its first service next week, so I will get things checked out.
I mentioned all this to a chap at work who also has a Gti, 3 months newer than mine, and guess what! His did exactly the same thing 2 weeks ago.
In my mind there has to be a leak somewhere?
Ian