My "roar" went away some time ago which lead me down the fan hub clutch fluid path... I experimented with different levels of various fluids and ended up fairly close to stock, but with a bit more fluid and slightly higher weight oil (8000cst?). This got the engine roar back to the way I remembered it and helped keep temps in check at lower speeds, but the difference was not drastic.
Here are two examples of conditions that make my rig heat up:
-One of the quickest ways to get the coolant temp to shoot up is to drive up a steep grade at 20-30 mph. Think gravel, mountain roads with lots of twists and turns. In these cases, higher rpms seem to help a little, and cranking up the heat helps a lot.
-While towing an enclosed cargo trailer (2500 lbs?) at freeway speeds in hot weather with the A/C on going up a moderate grade. Turning off the A/C stopped the temp rise and, again, turning on the heat would bring the temps down quickly. On this particular trip I even tried running the rear heat and leaving the A/C on, but the results of this were inconclusive.
My conclusion, like others on this forum have stated, is that the cooling system is only just sufficient for these trucks. It keeps up fine under nearly all conditions, but throw in a steep hill and/or hot weather and you will watch the needle go up. You just have to keep an eye on it, much like any older vehicle.
Here are two examples of conditions that make my rig heat up:
-One of the quickest ways to get the coolant temp to shoot up is to drive up a steep grade at 20-30 mph. Think gravel, mountain roads with lots of twists and turns. In these cases, higher rpms seem to help a little, and cranking up the heat helps a lot.
-While towing an enclosed cargo trailer (2500 lbs?) at freeway speeds in hot weather with the A/C on going up a moderate grade. Turning off the A/C stopped the temp rise and, again, turning on the heat would bring the temps down quickly. On this particular trip I even tried running the rear heat and leaving the A/C on, but the results of this were inconclusive.
My conclusion, like others on this forum have stated, is that the cooling system is only just sufficient for these trucks. It keeps up fine under nearly all conditions, but throw in a steep hill and/or hot weather and you will watch the needle go up. You just have to keep an eye on it, much like any older vehicle.