I took delivery of my new A250 last week. On Sunday, after hitting 180 miles on the clock I saw a 'coolant level low' message appear. The tank looked very low with coolant. I assumed it simply needed topping up but thought I'd give Mercedes Assistance a call just in case. Pleased I did as the Technician said the system was leaking and unable to maintain any pressure - he assumed it must have been due to a faulty part fitted at the factory. It's now at my local dealership being investigated but wondered if anyone else has seen/heard of this? It's just disappointing to get this on a brand new car so not too happy right now...