One problem related to radiator has been reported for the 2013 Infiniti JX35. The most recently reported issues are listed below.
The radiator fan motor started making loud noises and soon afterwards broke. The engine started overheating and I barely drove the car to the infinity dealership in coral gables. My infinity has 34,000 miles, but it's been more than 4 years since I bought it and the service department at the dealership in told me that the fan assembly radiator motor is not covered by the engine warranty. The service adviser told me that they see such defects quite often on similar vehicles.