I have a 99 Avant Quattro. It leaked some coolant. My mechanic thought it was a loose clamp on the coolant resevoir. They did a pessure test and things looked fine. I recently found a new puddle of coolant and I am wondering if the water pump is toast. Anyone run into this before? It has about 103K. The water pump, timing belt and tensioners were replaced at around 35 K from a previous pump failure.