In Reply to: 54 NAA posted by LJ on June 14, 2020 at 22:19:02:
Try removing some coolant thru the radiator drain petcock on the bottom of radiator. OEM Owner's manual states capacity of cooling system is 15 quarts. 1-1/2 - 2 gallons should be sufficient to clear upper hose. As John said, petcock on block can remove more if needed.