Not sure if this should be in the Prius C forum, Gen II Care & Maintenance, or Gen II Mods, but here goes... The Prius C and the 2nd gen both use the same engine (1NZ-FXE). The Prius C has an all-electric water pump for the engine; the 2nd Gen Prius does not. How viable would it be to replace the belt-driven pump on a 2nd Gen Prius with the electric pump from a Prius C? Any ideas how the pump itself is controlled - automatically by its own temperature, or by some computer somewhere else? Does it just take a 12V DC power line, or does it require a 3-phase drive for its motor? And would it be worth making this change?