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I have a 2004 2500hd with the LLY It has been overheating so i put new thermostats in it, new water pump, and head gaskets. After all that it is still overheating it will run fine at idle and have no heat, once you drive it down the road and go over 35 it will overheat very quickly, after that i put a radiator in it and it seemed to help it only overheats driving down the freeway at 70 mph but i still have no heat but once i stop it will go back down to just under 210. I followed the special fill procedure on the gm website and i have put about 100 miles on it trying to get any air out of the system. PLEASE HELP