Thanks a lot for your feedback and the video link gents. I'll go and check heater core now. But I agree that the pressure test couldn't have been conducted thoroughly, it's the only logical conclusion. A leak must leave a pressure drop. Will investigate further. Cheers. Kev.

Hi all you experts out there, A new boy on the block with, I'm sure, a fairly common problem. I have a 1999 Volvo V70 XC AWD and its leaking coolant. It's been pressure tested at garage and help pressure. No smell of coolant from exhaust but no obvious leak below engine either. A strange scenario. I...