PLEASE HELP! We have a 06 Titan 4x4 with 62,000 miles on it. We absolutely love this truck and so far have had all of the recall work done on it and had a few things replaced under the 3/36 warranty and everything was great. The manifolds were replaced a few miles ago because both were cracked. Then boom, getting ready for vacation and towing TT and exhaust falls completely off due to rust. We replaced that, then 2 days later radiator explodes. The bottom blew a hole in plastic. Got replacement radiator and 3 days later boom, blowed again. Called Nissan dealer and they say haven't had problems with other trucks and radiators. So we think there is a pressure problem. Took to local private reputable mechanic. He did a combustion leak detector test on the radiator and says the head gasket is blown. There is no steam from tailpipe, no leaking antifreeze(other than radiator busted), no antifreeze/oil mix at all. I have searched online for 2 days and can't find any other Titans with head gasket blown this early. Mechanic wants $2000 to replace gaskets and I'm not sure what it is. Any input is greatly appreciated. Also truck has never overheated EVER.