One problem related to engine overheat has been reported for the 2004 Chevrolet C/k 2500. The most recently reported issues are listed below.
In wyoming, traveling i90 to hyw 16 mountain pass. . . 7 per cent grade. . . . After two miles engine overheated and had to pull over to let engine cool down. . . Had to take another route to bypass mountain. Googled duramax overheating and found this was a very common problem on the 2004 duramax diesel. . Design problem prevented adequate air from entering engine. . . Should have been a recall or at least gm should have offered a solution. . .