Hi all

Only had car a week done about 500 miles used 3 litres of coolant. Had pressure test all ok. No visible leaks so any ideas could it be a massive airlock ?

I remember a post similar a while back. I think it turned out to be a coolant pipe that runs across the top of the engine. I had a tiny hole in it.

Take it back?!

Penny to a pound it's the water pump.  It's driven by the cam belt, nestles in a hole in the engine block, and leaks invisibly into the area under the cam belt cover.  Coolant doesn't run out of the cover because it dries out on the hot block.