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There's a loud squeeling coming from the ac unit. I replaced the blower motor and that didn't fix it. I read somewhere that this is the rear blower motor. I have not been able to find a PDF on the rear blower assuming this is it. Any help?
 

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You should be able to disconnect the rear motor fairly easily to help you diagnose the source of the noise. I believe you just remove the drivers side lower panel on the center console and unplug the connector on the transistor. There are some pictures about halfway down this page:
Acura MDX How can I fix Acura MDX rear blower transistor.

Also, there's a TSB for noise caused by accumulated debris around the cowl and wiper posts up front. I'm attaching the PDF for it.
 

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I replaced 2 parts to fix the screeching noise coming from my a/c
1) the rear blower fan under the driver side seat center panel
Credit to following online guide
2) the rear blower transistor under the driver side middle panel
Bought part on Partsgeek.com for $35 + shipping
2003-2008 Honda Pilot Blower Motor - Rear - UAC BM 10011C
Credit to following online guides
Bought part on Amazon for $15
PartsSquare Rear A/C Heater Blower Motor Resistor For Acura MDX 2001-2006 79330-S3V-A51 RU364
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