Thanks for the write up. My reservoir is leaking. I have had a lot of cars. This is the first to have a water tank leak. Most of the other cars have been older than this one also. Is this some kind of defective tank? Will I be replacing a defective tank with another defective tank? $12 would seem OK, but $70, especially if it is not a very good tank, seems like a stretch. How many people out there have had leaks?