So my '98 A4 2.8 quattro is leaking coolant in the front right. It is a very very slow leak... i filled it about 3 weeks ago and its not even half way back down to the add line again. But there is a very small drip puddle under it each day. I had it looked at and they said "probably a cracked radiator", but they didn't actually take it apart. Anyone else have a problem similar to this or have ideas for what it could be or what I should look at to figure this one out? Someone had mentioned Polygard Radseal to try sealing it. There's no problem mixing this with the Audi antifreeze (G12) right? Also, I read something about waterpumps, would that be of a concern? Thanks a bunch!