Best Water pump for Volkswagen Jetta

The two timing belts I've done the water pump have been that design.

Do you still have the original water pump? Those has plastic impellers that fail. Replace it with a metal impeller pump (Graf and Hepu are ideal).

Just to let everyone know, it did indeed turn out to be a defective O-Ring on the Graf water pump I installed a couple of months ago.

Just following up on this- I replaced the water pump and that appears to have resolved the issue. I have been monitoring it frequently and there has definitely been no sign of coolant leaking under the car in the area it was doing it from.

I bought my 2001 Jetta with 80k on it. It came with a broken water pump (plastic) plus 6 belt valves and a quarter of the teeth missing from the timing belt. The pump was in about 30 pieces and the damage to the valves was do to the water pump.