strange noise after replacing radiator fluid on 2002 Chevrolet Avalanche 1500

Shortly after flushing out the radiator and replacing the fluid, i started hearing, what sounds like a fan running intermittently, while i'm driving. Could this be something I did wrong when flushing the radiator? any help would be greatly appreciated!

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1 answer
ck your fluid level it may be low or have an air bubble in it