that'd be a good first step is add a schroud & locate a correct pulley cuz (with it) you want the fan 1/2-3/4 into the schroud (others will clarify on the exact "perfect" distance) but it totally changees things from the no schroud fan needing to be (correct for that system) very close to the rad

live every 24 hour block of time like it's your last day on earth