electromagnetic fan not switching ON

[dassel]

I've checked and replace the fuse I've also replace my temp sensor, only the electric fan switches on at about 105'.
NO main fan switching ON at about 100' how it used to.
What could be the problem? and how do I check to see if my fan clutch has stop working and or is there a temp sensor or switch for the electro fan itself?

"your responses would be aprreciated"

190e-16v 1986 2.3