Drove 300km last week, then the "COOLANT LEVEL" came on. I had topped it up a week before, so was a bit concerned. 600km later, the expansion tank was empty again. Drove another 400km on Sunday, and the tank was empty again.

I took it to the dealer this morning, and they pressurised it, but didn't find any leaks and held the presure. They topped it up again, and I drove about 5 minutes down the road and parked. When I parked, there was a steady drip coming from the expansion tank side of the radiator, but I did't open the hood to see where it was coming from.

So I'm thinking that it only leaks when the engine has been running, with a leaking headgasket that would pressurise the cooling system a lot. Since there were no drips after being pressurised with a tester for 10 minutes, and it only leaks when the engine is running.

Anyone got any ideas???