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Engine Overheating on 1998 BMW 740i

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My engine overheats when the air conditioner is running. When the air conditioner is off the thermostat returns to normal... I have replace the coolant, thermostat, radiator cap, radiator heat sensor, all hoses and installed a new radiator. Could my problem be a bad water pump? The timing and head gasket are fine...
(1) Answer
If the coolant has been bled properly, no leaks present, check viscous fan operation, thermofan operation, thermoswitch operation, remove and visually check waterpump.