You should park your truck on a slight incline and slowly open the bleeder to let the air out and insure that the over flow is full so it will suck the coolant back in instead of more air.

Here:

STANDARD PROCEDURE - REFILLING
COOLING SYSTEM 4.7L ENGINE

CAUTION: Failure to purge air from the cooling system
can result in an overheating condition and
severe engine damage.

(2) Remove the cooling system bleed plug from the
radiator upper hose inlet housing. (Fig. 8)Fill system
using a 50/50 mixture of ethylene-glycol antifreeze
and low mineral content water, until coolant begains
coming out of the cooling system bleed hole. Install
the cooling system bleed plug. Fill radiator to top and
install radiator cap. Add sufficient coolant to the
reserve/overflow tank to raise level to FULL mark.
(3) With heater control unit in the HEAT position,
operate engine with radiator cap in place.
(4) After engine has reached normal operating
temperature, shut engine off and allow it to cool.
When engine is cooling down, coolant will be drawn
into the radiator from the reserve/overflow tank.
(5) Add coolant to reserve/overflow tank as necessary.
Only add coolant to the reserve/overflow
tank when the engine is cold. Coolant level in a
warm engine will be higher due to thermal
expansion. To purge the cooling system of all air,
this heat up/cool down cycle (adding coolant to cold
engine) must be performed three times. Add necessary
coolant to raise tank level to the FULL mark
after each cool down period.


STANDARD PROCEDURE - ADDING
ADDITIONAL COOLANT
The use of aluminum cylinder blocks, cylinder
heads and water pumps requires special corrosion
protection. Only Mopart Antifreeze/Coolant, 5
Year/100,000 Mile Formula (glycol base coolant with
corrosion inhibitors called HOAT, for Hybrid Organic
Additive Technology) is recommended. This coolant
offers the best engine cooling without corrosion when
mixed with 50% distilled water to obtain to obtain a
freeze point of -37°C (-35°F). If it loses color or
becomes contaminated, drain, flush, and replace with
fresh properly mixed coolant solution.
CAUTION: Do not use coolant additives that are
claimed to improve engine cooling.

NOTE: Do not remove radiator cap for routine coolant
level inspections. The coolant level can be
checked at coolant recovery bottle (Fig. 9).

The coolant reserve/overflow system provides a
quick method for determining coolant level without
removing radiator pressure cap. With engine not running,
open the coolant recovery bottle cap and
remove coolant level indicator dipstick to observe
coolant level in coolant recovery bottle. The coolant
level should be between ADD and FULL marks. If
the coolant level is at or below the ADD mark, fill
the recovery bottle with a 50/50 mixture of antifreeze
and water ONE QUART AT A TIME. Repeat this procedure
until the coolant level is at the FULL mark.

 

Thats pretty thorough directions hydra. We basically did something like this the first time but we burped it only once

thats probably why we missed an air pocket.