Yeah I’ve heard of this and other similar issues. Coolant running into the transmission and whatnot. From the research I’ve done that seems to be the earlier 2nd gen trucks that did that and Nissan has since remedied that. Also I’ve heard, regarding this issue, simply replacing the factory radiator can fix it.
yup you got it, biggest issues for frontiers was the transmissions dying due to this. You can either replace it with an all metal radiator or add an external cooler for your transmission and will also fix the issue. I've also been looking for a newer truck as of late and determined it will be a frontier just due to the cost savings vs a tacoma