Squealing/Shrieking noise from behind climate contol head....

[Kneale Brownson]

Sure sounds like a blower motor squeal to me, Steve.  Try spraying some 
kind of lubricant (I used one that included some teflon in it) into the 
hole on the side of the blower motor housing where the ventilation tube 
takes air from the squirrel cage housing to the motor housing.    Did you 
use a new blower motor or a rebuilt?


At 08:36 AM 10/08/2001 +0000, Stephen Ankney wrote:

>Listers,
>OK, I've been having this little problem with a squealing noise coming 
>from behind the climate control head on my 88 5000S. At first I thought it 
>was the aspirator motor for the interior temp sensor going bad so I 
>replaced it with a known good one. This seemed to work for awhile but now 
>that I'm using the CC(heat) more the squealing is back. I thought that 
>maybe I could just disconnect the aspirator motor and be done with it but 
>would'nt you know it, the noise is still there after I disconnected it! So 
>obviously it's not the aspirator motor...
>
>So...what else could it be? The noise is centrally located somewhere 
>behind the CC head or maybe coming out of the vent directly on top of the 
>CC(which makes no sense)...
>
>Has anyone ever experienced a CC head that started to squeal when going 
>bad? Anything else that could possibly be in that area that would do this?
>
>Symptom recap:
>CC head appears to be working fine. Heat/air comes on fine and blows out 
>of all vent options. After a couple of minutes of running there is a 
>squealing sound that gets louder and louder and then stays 
>constant...unless you put the heat/air on high, then it goes away....
>
>The noise is so loud that it can be heard from outside the car. Could it 
>be something in the plenum area? Thats where the noise seems to be coming 
>from the loudest when listening to it from the outside. I'm stumped...I 
>thought for sure the aspirator motor was the culprit...
>
>BY the way, the blower motor was replaced with new one a year and a half 
>ago...
>
>Any ideas? I going to try and track down a used CC head tommorow and see 
>if it makes a difference. Thanks!
>
>Steve
>88 5000
>Michigan
>
>
>
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