How I test fan clutches in cars: Cold, engine stopped-fan should be able to spin freely by hand. Next, run the car enough to where the fan should definitely be on. Stop motor and immediately check to see how hard it is to spin the fan. If it's kind of hard to move, then you're good. If it spins freely like it did in the cold test, it's time for a new fan clutch.

Aux fan not spinning with AC on: Is is getting power?

Running with AC on in Helena, MT in November: ???????

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.