Hi all, I appear to have what I believe to be a radiator leak in my 306 Turbo Diesel. I have to top up my coolant every few weeks, and there is some greeny blue gunk on the radiator. I really don't have a clue about cars and wonder if you guys could help me not get ripped off! 1. Is my diagnosis of a leak likely to be correct? 2. Is radiator sealant a viable option to repair this or is that just storing up problems for later? 3. Can a garage repair this, or does it require a replacement radiator? 4. How much is this likely to cost? 5. I passed my MOT last week, should this have been picked up? Any help or suggestions would be much appreciated. Many thanks, Sean