one side of the radiator is super hot

1989 CHEVROLET SILVERADO
397,000 MILES
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MIKAIL97
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When we run the truck and warm it up one side of the radiator is super hot and the engine gets hot, there is no coolant flowing through the upper hose?

replaced lower rad hose
changed thermostat
Jul 9, 2012 at 10:27 PM
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