I don't think you need a fan clutch with those temperatures/conditions. 100dC on the coolant temp indicator should not shut off the a/c. The fan in front of the condenser is running has all to do with the a/c system and not much to do with the engine cooling system.
Why don't you connect some gauges to the a/c ports and come back with some numbers. Oh yea, we'll need numbers at 1500 rpm too
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