The radiator may have split, when you put coolant in the reservoir, did it suck back into the radiator? If the rad is cracked, it will not. I know this, because I just replaced my radiator at about 125,000 miles. It was surprisingly expensive. That stopleak stuff is nasty, but it will buy you some time. IF you have to replace it, AND you decide to go aftermarket, you will have to rig something up to use stock fans, and may have to get thinner, aftermarket ones. If you have to replace the rad, do the uper, lower hoses, and one to heater core at same time.