[Shinel]

So guys I have a 535 with a out 120k on the clock and I have this thing with the fan where once it reaches about 100c the fan starts to kick in on and off at about 5 second intervals. The coolant temp then comes down to mid 90c. The oil temp sits at around 205f. What can this be, I've read that that's a sign that the waterpump might be failing, or the thermo, or the temp sensor. Before I go and pull the pump, can I test it?