Today, I removed the splash guard underneath of the engine to replace the a/c belt. I found that the a/c belt was installed behind the engine belt on one pulley, that means engine belt must be removed before removing a/c belt, that requires lots of job to do to remove engine belt. So I gave up and left it to the stealer.

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--2004 E53 X5 4.8is - ECE version; right hand drive; Located in Hong Kong; ext. black sapphire metallic; int. leather black; adaptive dynamic bi-xenon headlights; 16:9 onboard monitor w/o navigation; 20" genuine BMW Y-spoke 214 wheels with Bridgestone Dueler H/P Sport tires; Int. rear view mirror w/ compass.