Your mechanic has the V6 water pump and the Zetec water pump highly confused. The Zetec water pump just does not break. (Although, I'm pretty sure I have a Cardone water pump in which a seal went bad, causing it to leak, but I have yet to run tests on it to verify if this is true). However, it IS common for hoses to burst on the Zetec. I blew off the heater hose on my car, and I have read of many others having the same and/or similar problems.
I bet your water pump is working, but your system is plugged up somewhere. However, it is still a good idea to replace the pump, as it is pretty cheap. Swap in a new pump, run some water through the cooling system for awhile to clean it, then refill with coolant.
Ian
Mine - CDW-27 Zetec ATX | Hers - D186 Vulcan ATX
Aircougar Performance
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