vwlfan:
It looks to me this was a factory job not some add-on. I agree it looks like a rotary gear pump. These are positive displacement pumps, when you engage them the water has to go somewhere or something can break. Make sure your relief valve is working and not set too high. The few I pumped were noisey, I dont know if they all are. Front mounts in my area are less than 20%, factory front mount with a rotary gear mid mount, never seen one before.
Tim
