If the clutch is working well, you will not be able to stop the fan when it is hot. In my case, after driving for 10-15 minutes when it is 100f out, the fan at idle is pushing noticable air and I was unable to slow it down to any noticble degree, even when applying quite a bit of pressure. An easy way to check is to hold a rolled up rag and put that against the fan. If the clutch is bad the fan will instantly slow down to a stop.