2006 GX470 189,000 miles.
Replaced battery and was idling 15 minutes to warm it up to relearn idle.
Stepped away and saw this leak underneath. It's oily, not antifreeze. leaking from bottom of radiator bracket. No evidence of leaking anywhere top side.
Power steering?
AC ?
Transcooler?
Oil has a light red color to it. No smell.

 

Tranny oil. Check the rust on tranny cooler lines

 

Where's the tranny cooler? In back of the main? I haven't removed any plastic yet.

 

Also think it's transmission fluid.

The cooler is in front next to the horns.

Chip H.

 

It's NOT the trans cooler, all dry. I did find a slight radiator leak. Tasted it, very bitter.

Trans cooler looking down at connections

Trans cooler looking down at connections

Trans cooler front

Slight radiator leak

 

As a note, the transmission cooler is an auxiliary cooler (it comes with the tow package I think?).
The radiator also has a cooling loop for the transmission fluid. The connections are on the passenger side under the overflow tank.
So it could indeed be either coolant (normally pinkish or red) or transmission fluid (red).

When my radiator went bad it leaked on the driver's side, on the plastic end-cap.
For replacements, you can use the OEM of course. But people have also had good results with the Koyorad.

Chip H.