need help before winter

Ok, so i put in a 2 row single sided aluminum radiator, new OEM radiator cap with install, the fan is a pusher fan located at the front of the radiator. The car puts out great heat when im moving/driving, but if im at a light or letting the car warm up it will not put out ANY heat. The oil is NOT milky, the radiator fluid is nice and green no swirls from oil. I also bled the system completely. Still not sure why its doin this, but i need this fixed so in the winter, i can defrost my windsheild and let the car warm up. HELP! thx.


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