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I hear a "honking" noise at idle and acceleration on 1999 Honda Civic

I recently replaced my radiator, and I hear this "honking" noise upon acceleration and at idle...I THINK it's coming from the resevoir...can anyone help?

Asked by for the 1999 Honda Civic
pressure test rad cap or just repl to elimate it. its only like 6 bucks then you will know for sure
2 more answers , 1 more comment
pressure test rad cap or just repl to elimate it. its only like 6 bucks then you will know for sure
Check rad. cap.
I did that first, it seems to have a snug fit.