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Old 10-07-2011, 04:10 PM   #1
MyOtherRideIsUrMom
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2014 Outback LTD ISM

Default Reason for multiple HVAC motor failures?

My car is an 07 WRX with about 120k on it. It was bought new. Around september 2010, the original blower motor started making clicking and screeching noises. I replaced the blower, and just over 1 year later, it has started doing it again. The first time, as with this time, I will be replacing it with OEM parts. Has anyone had multiple blower failures like this?
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Old 10-07-2011, 08:12 PM   #2
Cougar4
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If something is restricting the rotation of the motor that can cause damage to the motor.
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Old 10-07-2011, 08:35 PM   #3
MyOtherRideIsUrMom
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I forgot to mention there was nothing noticeable with the first one. I have a cabin filter that I change every spring.
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Old 09-30-2013, 05:42 PM   #4
MyOtherRideIsUrMom
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My blower motor just started dying again. That puts me at 3 replacements in 200k/5years.
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Old 09-30-2013, 08:04 PM   #5
Cougar4
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Since you are hearing noises it sounds like the fan is touching something and restricting the motion of the motor.
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Old 09-30-2013, 09:05 PM   #6
DentMagnet
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Maybe the impeller is missing a balance weight. This is something you could look for in the ductwork.

Also, if the motor is mounted with rubber isolators, maybe these have hardened over the years.

The HVAC-Talk forum may have several more candidate causes.

I also have HVAC problems and I will soon be searching as to whether there is a class action lawsuit against Subaru about this issue.
IIRC they already had one because the odometer read a few percent high causing the warranty to expire sooner in some cases. Seems like this is sort of related to 'odometer fraud', but I don't want to appear to be anti-business. . .

Last edited by DentMagnet; 09-30-2013 at 09:33 PM.
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Old 10-01-2013, 03:20 PM   #7
MyOtherRideIsUrMom
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Quote:
Originally Posted by Cougar4 View Post
Since you are hearing noises it sounds like the fan is touching something and restricting the motion of the motor.
With the original one, and the first replacement, I thought there was something touching. I never found anything, and my last one there was nothing either. I have a feeling I will find the same thing this time.

It always starts out griding, then goes to squeeling, then stops. I was hoping there would be a new revision, but no luck yet.

The second time it happened, I checked all of the rubber mounts, they all seemed fine.
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Old 10-01-2013, 06:02 PM   #8
Cougar4
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If a grinding noise is heard right after installing a new motor something is touching the fan that shouldn't be.
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Old 10-01-2013, 10:25 PM   #9
DentMagnet
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I inferred that the new motors all started out quiet, so then the grinding would be the motor bearing being ruined, followed by squealing, followed by failure.

Impeller imbalance should cause the motor shaft lateral/radial runout or backlash to increase.
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