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Q: 2004 bmw x3 3.0 on 2004 BMW X3

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
overheating problem.expanson tank bleuw up.so i replaced the expansion tank,thermostat and the rad.fan switch still over heating in the trafic.how do i check the rad fan if it is working or not
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On your vehicle you have a primary fan (Mechanically operated by fluid displacement) Only way to test the fan clutch is with engine off and cold engine. Carefully inspect if front of fan clutch is oily? Indicating not enough internal fluid to operate as designed. Also have your secondary fan (electrically control) because sounds like that was the cause of original cooling system failure.
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