I have one of my systems thats using the same heater core with 1 panaflo fan thats pulling air through the radiator and it gets about 42c at idle. This system was made for noise control so this temp is good enough. That was with an xp 1900 not overclocked.
Billa over at overclockers has stated that 2 fans in that setup will decrease airflow. Not sure how. You may want to try using 1 fan at full 12v pulling air through the rad.
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