I wonder if it would help to swap out the clutch fan on the Innova 2.5 with a pair of aux fans. I'm on the side of the fence that thinks dual aux fans would be better than a single clutch fan, all things considered. For one, aux fans has less parasitic draw as they only operate on-demand. That means, less power loss and better fuel economy in the long run. It also means I still get a full complement of air flow while stuck in traffic, among other advantages.

Is there a place on the 2KD-FTV for a screw-on thermo switch?

Wiring would slightly be a challenge as I'd want it to function like a stock aux fan would.... Run automatically at 100% when the A/C compressor is engaged and/or at 80% when the coolant temp goes up to a preset temp (ie. ≥85 °C). The fan then turns off when the A/C compressor is disengaged and/or if the coolant temp gets down to ≤80 °C.

* I'm just guessing the operating temp range here. I might fire up the ol' Techstream later and see if I can get a reading off of the coolant temp sensor while the engine is running at operating temp.

This might be more work than is necessary, but if I can somehow manage to get my butt off the sofa and actually start working on this, it's probably going to be fun.