Bimmerfest - BMW Forums - View Single Post - Mechanical Fan Exploded! Is another one Justified?
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Old 08-17-2011, 10:42 AM
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bluebee bluebee is offline
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Location: San Jose, California
 
Join Date: Mar 2008
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Mein Auto: 02 BMW 525i M54 auto 130K
Quote:
Originally Posted by oembimmerparts View Post
When the water pump or fan clutch bearing start to fail they allow the fan to dip down and come into contact with the fan shroud and that causes it to fly apart
This (the bad waterpump cause) is new information, to me.

Since it may be new to others, I'll add this thread to the bestlinks:
- What could cause a fan blade to disintegrate (1) (2) (3) (4) (5)

Summary of reputed causes of fan disintegration:
  • Bad fan itself (rare)
  • Bad motor or transmission mounts
  • Bad viscous fan clutch
  • Bad waterpump

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