Did the 2003 VW from El Granada, CA, April 14, 2011 ever get an answer?

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This description fits our VW Eurovan 1999. Did this person ever get their's repaired? Visitor in El Granada, CA on April 14, 2011 Problem originally just happened when we drove up the hill we live on with a full car. A knocking noise would occur and then stop when you let up on the gas. Problem then started to happen at different times in different driving conditions. Most recently the noise would happen when I am on the freeway at speed and the knock would start slowly and then build up to almost constantly. I just had the water pump changed, thought it was that, but problem continues with new water pump.

What makes this problem better or worse?

Worst on hills, stops when foot is off accelerator

How long has your 1999 Volkswagen EuroVan had this problem?

at least six months