I've recently started learning to do things for my Audi A3 1.9tdi (V-Reg, 1999) so I'm no expert. I had a little problem with my car, and was told by a garage that my radiator was causing it (car hitting 90 degreese VERY quickly & loss of coolant over a period of a few weeks). I topped up the coolant a few times over the last month or two, but it keeps happening - the warning light comes on on the dashboard display, and the expansion tank is EMPTY! I decided to do what the garage said - and jeez, he was right - the radiator in my car was battered, and it had dried pink ooze at the bottom of it - clearly been leaking. Anyway, all new radiator has been fitted. Since I've done this though, I spotted a leak when I was flushing the system with water - the lower radiator hose seemed to be drippping, ever so slowly. I have since replaced this, and it seemed to make the problem go away whilst i ran the engine to test for more leaks, but it appears now that something else is leaking - the ECT sensor which is just above that hose, connected to the radiator. Like I said, I'm no expert, but I don't understand how something like that could leak - if so, is it as simple as replacing the ECT sensor, and spotting any more leaks? Should I go main dealer or GSF? And, I've read somewhere about a new "green" ECT that is supposedly better than the standard black one. Any help is greatly appreciated. Thanks.