Hi. Here is the diagram.
Did you open the bleed screw on the timing cover by where the top hose attaches? You will have a hard time bleeding out the air if not. If you have a solid stream of coolant there, then you should have the air out. Just run it with the radiator cap off for five or ten minutes and all air should then be out. If it is still overheating you may need a thermostat, or you may need a radiator. These trucks have alot of radiator problems.