Have 2005 chevy Silverado and its overheating have changed the water pump and thermostat have new hoses what else could be the problem

I would run radiator cleaner thru truck several times till water is clear and fill with correct ratio of antifreeze/water. Check oil if milky you have a cracked head or head gasket . clutch fan may not be engaging radiator old or incorrect for truck Semper Fi!

Try this procedure:

• The thermostat can be stuck close. If you feel the upper hose very hot and the lower hose cooler than normal, it may be a stuck thermostat.

• Make sure the radiator and the overflow bottle are filled to the proper levels.

• Bleed air from the coolant system:This is best done by running the engine with the radiator cap off until you see when the air bubbles stop coming up.

• Check the radiator fans: The easiest way is to turn on the cars air conditioner and turn up the A/C fans. Both radiator fans should come on when the A/C starts

• Make a pressure test by using a pressure testing tool (available at most auto parts stores). Use the pressure shown on your radiator cap. Most cars are 16 PSI or less, so don't exceed that pressure. Replace the radiator cap if it doesn't hold the pressure.

Does the cooling fan turn on after the temp gauge approaches just below midway?