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Old 12-13-2012, 09:57 AM   #1 (permalink)
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Air Vent Ratcheting Sound

2006 MDX - ratcheting sound from air vent system when temperature is adjusting. The blower and recirculating fans have been replaced under warranty by the dealership. Computer is not issuing any error codes. Anyone experienced the same issue; if so, what component is causing it? Any information will be appreciated.
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Old 12-13-2012, 08:56 PM   #2 (permalink)
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Air mix motor.

I imagine if you set the temp to full cold or full hot, the noise goes away.
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Old 12-14-2012, 11:22 AM   #3 (permalink)
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Yes, the ratcheting sound does stop when temperature adjustment is set at maximum high or maximum low. There have been instances when lowering it just 2 degrees will stop the sound, as well as setting the blower fan on maximum for 10-20 seconds.
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Old 12-30-2012, 11:53 PM   #4 (permalink)
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Have this same problem with my 02 mdx when the AC or heat is on full blast, very annoying! How much is it to get it fixed?
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Old 12-31-2012, 10:35 AM   #5 (permalink)
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see following link.

Rattling Center Dash (Heater A/C Air Mix Motor)

good luck
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