Originally Posted by
DBdude
A radiator issue in a Nissan vehicle can cause problems with the transmission, especially in Nissan Frontier models manufactured between 2005 and 2008:
Transmission fluid contamination
If the radiator fails, the transmission fluid can become contaminated with coolant, which can cause shifting issues.
Radiator design
The transmission fluid lines for Nissan Frontier models manufactured between 2005 and 2008 pass through the radiator. A radiator leak or problem can destroy both the radiator and the transmission.
this is easily resolved