I have just purchased the truck listed in the title of this post, the vehicle starts and runs fine, no signs of an issue with ot, until you drive it for about 10 to 15 minutes, at which point the temperature gauge will shoot up to max and the truck begins to slow down almost to the point of shutting off if you continue to drive it. If you park it, and shut it off, the engine and coolant hoses are barely warm to the touch, but the gauge indicating that the temperature is at max will take hours to return to a cold level. This was originally, it gets more complex; during all this, the oil pressure gauge is also indicating the pressure to be just under the red/max zone as well. After checking out the cooling system, I observed that the larger radiator hose that goes across the top of the engine was suctioning tight, collapsing into itself from pressure. Opening the resivoir released that pressure, and since the coolant line had not increased in temperature during this I had guessed that maybe it was failing to reach the engine due to lack of flow, so I removed the end of the radiator hose at the top on the far side from the overflow tank (which had no coolant leak out at the point I had done this) and added coolant directly into that hose that lead down into the engine. I then reconnected it, started the truck and the temp was back to normal (after 90mins time had also passed while trying to find someone at home that had coolant as I was stranded on a major highway far from any store that might).... It was not even 5minutes before the temp gauge returned to its max position, and I was not able to safely pull over until a few minutes after, which I barely made it to that place since the truck was beginning to shut down on its own. So again I opened the hood to help cool down the engine, opened the over flow tank to release the coolant pressure, but still, neither the rad hoses nor the engine felt hot at all. At this point I demanded that the previous owner come assist me in some way, since he swore the truck was good when I bought it. Since the engine wasn't seeming to be hot, he suggested running it with the radiator cap off to help push out any air that may occur in the coolant system, which didn't work.... The next possible suggested solution was perhaps the engine oil was blocked or clogged somewhere in the system, from being parked for so long. So he came to meet us and assisted in an oil change on the truck. Which had no effect on the condition. He then offered to take us to the mechanic that knew the truck, inside and out ( who wasn't capable of locating the vehicles switch to deactivate the "door ajar alarm/indicator - annoying sound that I wish still had a fuse to remove it, to stop the singing so he had to shut the door. He hooked up a Snap-on OBDII code reader to the truck and it sent back the code P1299