Seeing as though the pusher fan only plays a small part in the engine cooling system paradigm, I wouldn't place too much value in the numbers.

You say "about 92" prior to the fan change. So was that 94 or 90? And then there comes the question of "same conditions". How do you know they were "the same". Identical. Perfectly identical.

You're talking about a difference of at most, 4 degrees. That is less than 4% difference in the temps you provided. Are you absolutely confident that there was less than 4% difference in the comparative operating conditions you are quoting for your before and after?

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Cheers,

Anthony