What did you do to flush it, just use a hose? If you cascade powder and mix it with water, use enough cascade to make the water cloudy. Add the whole gallon to the radiator, bring the car up to temp with out the tstat in and let it run for a minute. Drain the radiator while its still hotish, let cool down a bit or use hot water and flush with straight water a few times until the water comes out pretty clear.