Convert Disco I to elec. fan
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It still turns from the friction of the water pump shaft but causes no drag on the engine and no cooling.
I drove a year with no working clutch fan and never knew it, the only problem I had was while offroading in Aug with the a/c on and climbing big sand hills the engine would heat up.
Turn the a/c off and it cooled back down.
Thats how I finally figured it out.