do you have a shroud around the fan? that will help the air flow by letting the fan make it's draw thru the radiator fins only. this is very important.
if the radiator has plugged tubes that would also create a problem. see if there is a rad shop that still knows how to do a tank and rod job. you didn't say and i am assuming you have metal tanks.
if you changed the fan with one of those flexible ones be sure to leave enough room for the flex. was the pump new or rebuilt. the rebuilt units could be suspect for lower flow due to the old impeller being reused.
are your auxillary fans coming on?
hope you solve it.
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