You need a real gauge for diagnostics.
The fan clutch testing is subjective - I seldom post how to test it because it's a relative thing.
You can look for tells: The thermal clutch has an orifice that opens via a bimetallic spring. It passes silicone fluid to affect a viscous lock-up. If you see slicone leaking out of the hub, that's a suggestion that the clutch has seen better days.
If replacing and Toledo gets hot, a heavy duty clutch works well. SOme gripe that it's too tight but if you live in a hot climate, this IS what you want.
Otherwise, folks like the Ford clutch.
Consider clutch cost (and fan balde cost if your plastic one is cracked as so many are. A new metal blade works great and costs 30 bucks) vs doing an E-fan (if you have a 3G alternator).
The E-fan can be a nice way to go. This is all of course if you are actually running hot. The temp gauge is needed.
Good luck.
