BMW X5 Overheating Problems?

I have a 2002 BMW X5 4.6is and lately it has been overheating.. The radiator hose has just been replaced and the air has been bled from the raditor but it still overheats. I find that if the air conditioner is being used, the car will overheat faster. I am due to take the car to a BMW dealer tomorrow but... show more I have a 2002 BMW X5 4.6is and lately it has been overheating..

The radiator hose has just been replaced and the air has been bled from the raditor but it still overheats. I find that if the air conditioner is being used, the car will overheat faster.

I am due to take the car to a BMW dealer tomorrow but would like to know what the cause can be prior to going in tomorrow (if you have an X5, your answer will be highly regarded)

Thank you
Update: Thank you. There is no water loss at all so no leaks.
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