AC was definitely on at the time...

when you say mechanical fan clutch, are you referring to the big fan, that I pull out when working on the car? Are you saying that big fan might not be running properly or starting to fail?

How can I determine if the water pump is going?

Car has 144.7k miles. Been real good to me!

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2003 X5 3.0i Silver (build 07/03)
2006 X5 3.0i Blue
1977 Ferrari 308 GTB
1994 Ferrari 348TS Speciale #14/15
1989 Ferrari Testarossa