This how to video is on how to replace fan clutch full easy install guide.
Jeep wrangler fan clutch test.
If still a problem then i d change out the radiator.
2 check for a worn bearing grasp the fan blade on either end with the engine off and check for lateral movement.
1 check for oil streaks or dust collected on oil streaks on the fan clutch it s a sure sign that the internal fluid that provides the clutch action is leaking.
How to tell if i fan clutch is defective 1 check for oil streaks or dust collected on oil streaks on the fan clutch.
The fan clutch is not an expensive part and it is difficult to test.
How to tell if a fan clutch is defective.
I m sure a lot of people will disagree with me on this but if it was my jeep i would just go ahead and replace the water pump thermostat and fan clutch and see where you are at that point.
It would need to be far more worn before you would notice it doing that test.
It s a sure sign that the internal fluid that provides the clutch action is leaking.
When it begins to fail you will notice it heating up at idle but it will pass the spin test you mentioned.
If you are doing the work yourself all of the above will be well under 500.