PWM sounds familiar. The AC signal gets connected to the + side at the compressor (I think). I've not looked into it deeply, just starting on it. Just got the radiator and fan out.
There's a sensor that gets screwed into the vent hole on the water pump. This will need to be drilled and taped to 3/8 NPT. But so far so good. Removing the radiator and fan went easier than I thought.

Upon a closer look, I saw I had about 1/8" of clearance between the stock fan and water pump. Hopefully the new fan is thinner.
I'm debating to just replace the radiator now, since everything is out. It is a 15 year old radiator. Likely will do this.

Thanks.

Edit: Just bought the griffin radiator. The old stock one was literally falling apart. It'll be a week or so till I get to it, but I'll add it to my build thread for the swap.