One problem related to radiator has been reported for the 2012 Nissan Frontier. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 Nissan Frontier based on all problems reported for the 2012 Frontier.
Engine coolant smell after driving. Radiator gets low on coolant. Overflow coolant level is full when engine is cold. Radiator is not pulling coolant back from the over flow when the engine cools down after being operated. This indicates a leak. Nissan dealer did a visual inspection but aid they found nothing.