I wired mine into the ACC relay's blue wire... Its in the relay pod on the drivers side.
See my other post on Altima EFans for more info
http://www.zilvia.net/f/showthread.php?t=62824
edit: yeah they run 100% of the time the key is "ON", and I have no problems with running too cold. Then again, I live in Los Angeles and the coldest weather the car sees is about 50 degrees.... A thermo sensor would be a nice touch though!
