5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
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its a liquid filled fan clutch. If it is not engaging you should also check to see that it is getting to a temperature where it should engage. If you have a plugged radiator or a thermostat that is sticking the fan clutch may never get to a temp where it will engage. I would suggets having the entire system looked over by a professional. you dont want to take any risks with your engine.
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