I'm running into a similar situation here. I have a 2006 Civic LX, I coolant leak which appeared to be the water pump. I just replaced the water pump which appeared to be sound. upon closer inspection the leak appears to be emanating from behind the housing where the water pumps connects, and is dripping down off the oil filter. There is what appears to be a steel coolant line attached to the back of this housing. This steel line appears to be the origin of the leak. Has anybody had any experience with this?

 

Call your local Honda dealership, and let them do a VIN inquiry. On some 06 Civic, the engine block might have flaws that result coolant leak and engine overheating.