and the FSM said to replace with a know good one when trooble shooting to rule the fan out in any heating problem.

after haveing 2 lock up and shear the fan off on one taking the rad/hose/hood out.

I just get a new 440 HD max cooling termo clutch one from napa and add a 7 blade fan to it for all of my engine combos.

runs about 65$ last one I got

but I have cleaned a lot up in the past,just check to see if it wobbles while mounted on the WP pushing/pulling on the fan blades.

if the seal looks like it has leaked or the oil built up on it was not from the fan clutch itself,you have a 50-50 chance of no trouble out of it