What is this?

[JME_GU]

I have installed a new radiator but it has an extra outlet that I had to block off. What is the extra outlet for?

BTW it is in a 4.5 GU

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[ashmccormick]

It could be an outlet for an auto transmission oil cooler? or for a return feed from a thermostat housing or something?

[JME_GU]

The radiator has two connections at the bottom for an auto trans cooler. The outlet that I blocked off is directly connected to the coolant (i.e. if I don't block it off, coolant comes out). I wondered if it was a coolant return line from the turbo (when fitted to a turbo diesel?

[Bush Ranger]

Has the new radiator have a cap? If not, it might still be for the over flow bottle.
Go back to the place you bought it from and ask them for further information about it.

[Col.T]

G'day mate,
my 08 3.0CRD has a totally different top on the radiator.
Main hose is on the left and the small outlet you're referring to takes a small hose across to the plastic pressurised overflow tank.
My guess is yours has a setup without that tank (or it's connected differently....unlikely) and so your new tank is a unit made to fit a number of different models but the supplier assumed you would be familiar with all that.
I suspect some suppliers derive twisted pleasure from having you come back for the answer they should have given at sale.
Luck,
Col