Nissan Pathfinder radiator failure causing coolant to mix with transmission fluid, resulting in transmission damage on Nissan Pathfinder

Some Nissan Pathfinder owners report experiencing issues related to radiator failure, which can lead to coolant leaking into the transmission system and causing significant damage. This problem is particularly prevalent in the third generation of Pathfinders, where the radiator is susceptible to developing cracks and leaks that allow coolant to mix with transmission fluid. Many owners find that this coolant contamination can result in improper lubrication, ultimately destroying the transmission and leading to costly repairs. Diagnosing this issue can be challenging, often resulting in extensive vehicle damage. To mitigate these risks, some owners choose to replace the radiator and flush the engine cooling system thoroughly, while others opt to bypass the integrated radiator transmission oil cooler as a preventive measure. Regular maintenance and early detection of radiator problems are crucial to preventing this serious issue from escalating.