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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 05-17-2005, 08:17 PM   #1 (permalink)
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what up all?

here's my situation. i started to notice that whenever my climate control unit was on, my engine made a kind of whiney and crackly sound. I then popped the hood and noticed that it was the front fan that did this. This is not the main engine fan, but rather the AC and cooling fan. when ever this fan turns on my engine makes more noise. do you guys have any ideas as to what might be causing this or how to counter it? what drives this fan? it is electric correct? thanks for your help.
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Old 05-17-2005, 11:37 PM   #2 (permalink)
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bump
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Old 05-18-2005, 12:51 AM   #3 (permalink)
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yes it is electric. check the blades on the fans. is there a blade missing?
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Old 05-18-2005, 01:16 PM   #4 (permalink)
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Also make sure it is tightend. If anything is a little loose it could make a whining noise. Also, did you check the pully/tensioner for the belt that runs the AC?
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Old 05-18-2005, 05:36 PM   #5 (permalink)
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Could the fan be rubbing slightly on anything?
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Old 05-18-2005, 09:02 PM   #6 (permalink)
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Originally posted by 94BMW325i@May 18 2005, 04:36 PM
Could the fan be rubbing slightly on anything?
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Maybe, but most likely when the fan turns on you are drawing more current from the alternator which in turn puts more load onto the fan belt. The extra load on the fan belt which is either not tensioned properly or is somewhat worn causes it to make more noise and whine. Therefore, check the alternator fan belt. This happens all the time with loose or worn fan belts.
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