Three problems related to radiator have been reported for the 2008 Infiniti G35. The most recently reported issues are listed below.
In my car, my radiator failed. That then made the transmission fluid and the coolant mix. My fluid in my radiator and transmission are like slime in there. My car doesn't function like it should.
Car was jerking while driving. I went to the dealer, was told that a radiator leaked to the transmission, and ruined it. Dealer flashed transmission, but later I had "check engine" warning. I went back, dealer told me that this is because of a bad transmission. This is not safe to drive a car in this condition. I still have a power train warranty, but Nissan refuses to repair transmission, because, they say, transmission problem was a secondary one, and the primary was a radiator. Nissan twice refused to repair under warranty.
The contact owns a 2008 Infiniti G35 x. The contact stated that while driving approximately 35 mph, the vehicle began to buckle and proceeded to stall. The vehicle was towed to the dealer for diagnosis where the technician stated that the transmission was contaminated due to a radiator coolant leak. The vehicle was later towed to an independent mechanic for the replacement of the radiator. The approximate failure mileage was 32,0000. Updated 2/11/cn a transmission specialist verified the transmission was clean and functioning properly, after four flushings. Updated 02/14/14.