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Absolutely do the flush and tests before anything drastic. But...
Back in NYC and NJ driving cabs, we used to crack the hood open so that the summer heat and AC would stress the engine less. The latch of course holds the hood down from flying off. Sometimes I do that now (very rarely).
Do you use the internal air recirculation setting on the vent system? If you do, you'll find you can shut the AC off for 10 or 20 seconds and still be blowing quite cold air. That might be enough for some hills. You could cycle the AC on/off during longer climbs.
Also, easier than adding another radiator fan would be simply to wire a switch to bypass the ECU's control of the OEM radiator fan and turn it on whenever you wish.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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