I had a plug crack its halfway down the left side of the radiator if facing the car. Its about 4 inches above the drain plug. Its not attached to anything us only a plug. It came out super easy and before I just threw a bolt in it I figured I'd ask if it has a name. The only thing I've figured is that it plugs what would cool the transmission in an automatic and mine is a manual so no need.

https://www.dropbox.com/s/pga077qew0sby8z/2015-01-19%2016.10.24.jpg?dl=0

If coolant comes out of the hole then its not a tranny cooler port those should be barbs sticking out of the rad cap side. Its likely a port for a fan temp switch.

Edited January 20, 201511 yr by ihscout54