You add up the last 5 numbers of your VIN, then w/ the key in the ignition on position 2, you hold the pin on the right side of the cluster until you see Test No 1, 2, etc and it goes up to 21 I think. Anyways, go to like test 7 and I believe that is the coolant one....better yet...Here is all the info

This will show the technique, and has a breakdown of what each screen does. www.e38.org is a great resourse even for us X5 owners since a lot is compatible about maintenance techniques, bleeding the cooling system on the V8 and other V8 specific items.

The fan clutch would be obvious if it was seized because it would have a lot of resistance and wouldn't spin freely at all. It's supposed to have a slight amount, but not enough that it'll slip under the belt from someone trying to turn it. But you also don't want to it spin so freely like when turning a ceiling fan off and it slowly comes to a stop...that just means that clutch has lost all it's waxy fluids inside. The fan clutch works using a waxy substance that causes it to flow less at low speeds, hence why it sounds like an airplace when you take off in the morning. After it warms up, the substance becomes more fluid, so it flows slower at low speeds to keep the fan moving, but that heats up and flows better at high speeds to free up the fan instead of being a drain on the engine....hopefully I made sense

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