Ok, here's the deal. Got another fan clutch, heavy duty this time, Hayden brand. Took off the old one despite some troubles with the bolts snapping, fixed it, got the right sized bolts, American fine thread, not metric, hence why they broke; I was impatient getting the other one on and didn't double check to see if the threads were truly the right size. They were slighhhttlyyy different but enough to have it bind up and snap on me.
Reinstalled the fan setup, ran it, everything spun true and of course massive cooling improvement at higher speeds compared to the other mediocre electric fans. Once again, let it idle for a good while. Shut it off and imediately grabbed the fan blades to spin it and whaddya knowwww! The damn thing is STILL freewheeling and not properly locking up. What is the chance of me getting 2 defective parts?? Something is not right here, the fan clutch is so ridiculously close to the radiator and it should be absorbing the heat, there's no question about that. It's getting plenty of heat absorbtion yet still freewheeling. Thoughts? Should I try a third
time and return this one for another one?