Thanks for the advice. I actually did pull the AC compressor fuse first, and the fan would still kick on when the defrost is on. However, I didn't even consider that the timing might be retarded. So yeah, I'll probably pop the fan fuse back in and see what's up. Spring will be here soon anyway, so I'll have to have it figured out by then.
And I did know that it's better to block the upper grille for aero, but this was easier, and I mostly did it for the faster warm up times anyway.
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