Most of your problem is in the intake. Hot air off the radiator is getting sucked into the filter housing, up to the turbo, which has to work harder to compress the hot air, which makes a hotter air charge going into the intercooler, which ends up pre-heating the air going into the radiator more then normal, which makes the cooling fan run more. The hotter air going into the radiator means there is less of a temp difference between the air and coolant, so the efficiency of the radiator drops, meaning the coolant temps rise. You can get the LBZ parts from the air filter to the turbo elbow and eliminate thate issue - but it will not be CARB approved. You may want to look at an aftermarket cold air intake (I run a banks with scoop). After you have the intake side taken care of, if you still have overheating, look on diesel place for a overheating lly's...