rocking noise diagnosed

It was the bearing in the pump,...the usual process is: coolant leaks past the pump's seal and over a fairly short time damages the double row ball-bearing. The bearing then can make a variety of noises as it deteriorates.

Jason

wow... that totally adds up.

the radiator busted on the top a few weeks b4 this noise came about. thank you.......

now, what would have happened if i just drove with the noise and turn up the radio?

thanks

so the rocking noise i heard was not from the radiator fan as i had inquired about