I bought my Frontier and almost immediately noted it was running hot, normal, but on the hot side. Logged into a complaint about it and discovered the radiator and transmission problems. I decided to replaced the radiator with a new all aluminum radiator, I wasn't about to replace it with a new (same) problem but a radiator I felt would keep my transmission fluid where it belonged. Since I replaced it I have not had any issues with either the radiator or transmission. Expensive fix, but if I had waited until it actually ruptured and started swapping fluids it would have been horrible.