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2005 BMW 525i Question: noise from hood or engine

 

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Visitor, Fort Worth, TX, October 01, 2010, 06:42

i just bought a 05 bmw 525i which has 110000.00 mile there is no problem except there is hard noise form the hood when i am driving the car , just wondering its because of HP or there is something wrong with my car

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    patrick mannion from Greg Solow's Engine Room, October 01, 2010, 08:00
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    It could be many things, unfortunately and without experiencing the problem first hand or being able to do some basic diagnostic tests its hard to say. Your car uses a fan clutch that locks up when the gel in the hub senses heat, when it locks up it cools the coolant in the radiator, as the radiator cools down the gel contracts and allows the fan blades to disengage. If the fan clutch fails to disengage it makes a strong noise as it is working all the time. As I say could be anything get it checked in case it is something serious.

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