The first thing you should do is disconnect the negative
Battery Cable and check that the system isn't hot or pressurized to protect yourself from injuries. After removing the pressure cap from the radiator, unscrew the mounting screws for the grill so you can access the radiator draincock. Set up a 24-inch x 1/4 inch ID drain hose on the radiator petcock and place the opposite end into a clean container to let the water out. If your car has one, unplug the electric cooling fan electrical connector and remove its two mounting bolts. Once the bolts are gone, raise the fan straight away. Unbolt the shroud supports and lift the shroud a small distance to clear the fan, placing it over the fan when you lift it. Disconnect and plug the automatic transmission fluid cooler lines and release them with Quick Connect Fitting Release Tool 6935 if it is used in your vehicle. Also, disconnect the radiator upper and lower hose clamps before unplugging the hoses. Place a mark showing the hood latch striker's position on the radiator crossmember. Then remove the hood latch striker, unbolt both upper crossmember to isolator nuts and remove the four upper crossmember bolts. Should the vehicle have air conditioning, take the mounting brackets off to remove the radiator from the condenser. While holding it up straight, remove the radiator from its place inside the engine compartment to avoid breaking its fins. To clean the radiator fins, run cold water and compressed air through the radiator's back side. Look over the cooling fins to see they are not damaged and also examine the plastic end tanks and radiator neck for wear or tears. First, set the radiator into the engine compartment and slide the dowels of the radiator onto the rubber grommets found in the lower crossmember. When you have air conditioning, put the condenser in place beside the radiator using the included brackets. Attach the upper crossmember with the four bolts and secure it using the two upper crossmember-to-isolator nuts to 10 Nm (86 in-lbs.) torque and if you removed the isolator-to-radiator nuts, tighten them to 5 Nm (47 in-lbs.) torque. Refit the hood latch striker to its marked place, join the upper and lower radiator hoses and join any applicable automatic transmission fluid cooler lines. Seat the fan and its mounting tabs at the bottom of the fan shroud into the slots on the bottom of the radiator bracket; tighten all four bolts to 3 Nm/31 inch lbs. Install the power cord from the electric cooling fan, slide the mechanical cooling fan shroud into place and secure it. Once you have located the draincock, shut it off, set the grill back to place, reattach the negative battery cable, flood the cooling system with the correct coolant and seal everything with the pressure cap. In the end, check and adjust the level of ATF in your truck if it features an automatic gearbox.