The fan clutch mod won’t improve city/hwy operating temps- it’s mainly for trail use to keep fan engaged at slow speed- lower rpm’s-moves more air and helps with coolant and trans temps
I’ve done this mod a couple times.
Drain clutch over night- I put 150watt spot lamp over the end of the clutch to passively heat it to get the fluid to flow. Try and measure the fluid removed- they are generally underfilled.
15k CST silicone fluid works well in a daily driver that also sees...