Cooling Fan relay setup

[Hcb3200]

What version of PCM are you running?
Or ECM e38? or something else

and I just realized you could run a PWM (pulse modulator)
GM/crysler/generic has them for single fans to control the speed as needed.
It can wire directly to most ECM modules and do what your asking nice and clean.

search for your model of ECM add PWM and fan wiring and a lot of sites especially on LS swap sites have all the pins wires you need.
You don't even need the fancy expensive corvette model there are some basic ones that work well .