blower fan starting to make noise.. what should i do - Mercedes-Benz Forum

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post #1 of 26 (permalink) Old 02-27-2010, 11:07 PM Thread Starter
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Exclamation blower fan starting to make noise.. what should i do

hello again everyone well i have been having a noise coming from my blower fan.. its a ticking noise and only makes the sound when the heat or ac is on... when i accelerate the noise gets louder but it is a constant sound.,, i know its the blower fan.. but what should i do.. is it a quick fix or do i need to replace the whole unit??

thanks for the help guy

by the way the noise is very anooyinggg
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post #2 of 26 (permalink) Old 02-28-2010, 12:22 AM
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you must check the blower (fan) itself. it is easy, only 6 screws to remove. search this forum for "blower" or "cabin filter" and you will find instructions how to get access to the blower. most probably all four screws of the blower are losen and the fan touches something. Or maybe something else is going on, it is almost impossible to guess.

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post #3 of 26 (permalink) Old 02-28-2010, 02:08 AM
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Originally Posted by vaser21 View Post
hello again everyone well i have been having a noise coming from my blower fan.. its a ticking noise and only makes the sound when the heat or ac is on... when i accelerate the noise gets louder but it is a constant sound.,, i know its the blower fan.. but what should i do.. is it a quick fix or do i need to replace the whole unit??

thanks for the help guy

by the way the noise is very anooyinggg
Mine went through a phase of making a noise every time I turned left! The motor, as I recall, is mounted on screws with rubber bushes so that there is some flexibilty. In my case, the fan moved a fraction under - I guess - a centrifugal force, when manoeuvring, so that it touched the nearest bit of fan casing. I simply untightened, repositioned and retightened and haven't had a problem since. You can't move the motor much at all, but you only need a gnat's whisker.

The fact that your fan makes more noise when you accelerate suggests that the fan swings back a fraction (or perhaps sideways, since it will respond like a gyroscope) and touches the casing more. Could be a very simple fix.

Good luck,

Mike
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post #4 of 26 (permalink) Old 02-28-2010, 05:41 AM
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Fan touches surfaces when the filter is no longer giving full flow.. as it pulls air it rises if there is not sufficient air .. change the filter .. or take it out to see if you still have noise.. if you do .. bottom bearing is wearing... needs lubrication...

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post #5 of 26 (permalink) Old 02-28-2010, 10:10 AM Thread Starter
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thanks guyss i will check it soon... but merc600 which filter the regular airfliter or the charcoal filter
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post #6 of 26 (permalink) Old 02-28-2010, 10:29 AM
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He's talking about the pollen filter that sits just above the blower motor.
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post #7 of 26 (permalink) Old 02-28-2010, 03:54 PM
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yeah that filter also has 2 types: regular and charcoal activated, not to be confused with the big one near the firewall

get the regular one. the other one is just money wasted

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post #8 of 26 (permalink) Old 02-28-2010, 07:41 PM
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Blower motor noise?

Remove the complete assembly and inspect it,could have a cracked or broken cage or blower motor could be moving up and down from getting worn out causing it to rub at curtain times.Check all screws for tightness and theres not much else that it could be...
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post #9 of 26 (permalink) Old 03-02-2010, 02:24 PM Thread Starter
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hey guys took everything apart... found a small pointy leaf in the blower fan took it out but sure enough the noise started again... so today i took it all apart again tightend the screwa which were not even really loose and i also saw that the filter had alot of debris in it so i vaccumed it out and reasemmbled everything looks like no more noisee yayaya
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post #10 of 26 (permalink) Old 03-02-2010, 05:15 PM
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I would also recommend immediate inspection. Mine did the same thing, it was the brushes bottoming out. Then the noise went away as the metal wore away, finally seizing the rotor, then blowing the thermo-switch. A nice $750 lesson nobody needs to learn! Check squeeky blower motors ASAP!

Good luck!
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