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vibration and hum from a/c fan

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2001 - 2007 V70
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Mike Langlois
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vibration and hum from a/c fan

Post by Mike Langlois » Sun Jun 30, 2019 11:22 pm

My 2002 V70 X/C started humming and vibrating when the climate control fan is activated. It gets worse the faster the fans is set. Anyone have any thoughts on that? The car is sitting mostly, during a major stereo upgrade; started, making odd noises that stopped when the fan is stopped, after the car was started today. I'm scrapping a V70 2.4 t and messing with the climate system looks like a challenge.



93SCMax
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Re: vibration and hum from a/c fan

Post by 93SCMax » Mon Jul 01, 2019 5:48 am

I had something similar a few years back. My problem ended up being dirt and grim had accumulated on the climate control fan blades making it off balanced. I took the unit out to investigate the vibration, and saw the build-up. Once I cleaned the blades and reinstalled, she was quiet as new.

It's not too hard to remove if you don't mind laying on your back in the front passenger foot well. Make sure to disconnect the battery before unplugging the unit. Also check your cabin filter for debris and possibly replace.

Good luck.
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oragex
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Re: vibration and hum from a/c fan

Post by oragex » Mon Jul 01, 2019 9:36 am

Another way is to undo the windshield cowl piece - the large black plastic piece - without removing the wiper arms, just lift if at the passenger side, and look with a flash light at the fan blower, you get a clear view. May try to slide a hand and remove any debris as mentioned above (don't put the garden hose on it). You will loose the black locking pins of the cowl - the center piece needs to be pushed down, may get a few new ones from Volvo
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2003 2.4i S60 automatic 125k miles
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Mike Langlois
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Re: vibration and hum from a/c fan

Post by Mike Langlois » Mon Jul 01, 2019 6:37 pm

Thank you for both suggestions. I think I’ll try pulling the cowl up before I go in underneath.



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vtl
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Re: vibration and hum from a/c fan

Post by vtl » Tue Jul 02, 2019 8:22 pm

The fan motor has a cheap plain (sliding) bearings. Once the grease is gone, the sleeve is gone. Replace the motor/assembly. Need that every 15-20 years.


2005 XC70 250k
2016 XC60 40k

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