gowen1 
2005 Nissan Pathfinder SUV SE 4WD 4dr SUV (4.0L 6cyl 5A)
Transmission oil cooler
 I recently bought a 2005 Pathfinder at a mileage of 110k. After reading scary stories about radiator coolant mixing with trans oil, I decided to take a preemptive measure as suggested, i.e. disconnect coolant line from the radiator and add an external transmission cooler.I took my vehicle to Volksdoctor. David, the owner, is very nice man.When he was trying to find a spot for external cooler installation, he found there is a small cooler in the front of the radiator. Then he checked VIN online and found this vehicle has a separate trans cooler. I was so happy about it. Thus, check your vehicle before you add one, you might have it separated already.