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Old 11-03-2017, 11:49 PM   #1
Spacepope
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2007 AURA XE
2003 ION-2 Sedan
Default 07 XE dashboard knocking

Hi all,

Wife's Aura has a ventilation system knock under the dash. Manifests itself with fresh air selected, knocking goes away when recirc is selected. Curious what might be the cause (hoping I don't have to pull the whole dash off to get to it). Advice where to start?

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Old 11-04-2017, 01:19 PM   #2
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2000 L-Series 2.2L Sedan
Default Re: 07 XE dashboard knocking

Questions for clarification:
1) Is the blower fan running when this knock occurs? (If so, does the blower speed affect it?)
2) Will it occur at any time whether or not the fan is on?

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Old 11-14-2017, 11:44 AM   #3
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2007 AURA XE
2003 ION-2 Sedan
Default Re: 07 XE dashboard knocking

Sorry for the delay:

Will knock when fan is on off/zero speed when car is started. Knock is independent of blower speed, so assuming not fan-related. Perhaps a diverter door?

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2008 Acura MDX 109k
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2003 Silver Blue ION 2, 46k Traded "Manni"
1998 SL 63K RIP "Bewm"

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Old 11-14-2017, 01:01 PM   #4
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2000 L-Series 2.2L Sedan
Default Re: 07 XE dashboard knocking

I would agree and believe that this is not fan, or blower motor related. Looking at a parts breakdown of the HVAC case and components it seems unlikely that an extraneous noise would be generated from a part within it. Assuming all is normal, the case assembly's tolerances are such that there's not much room for a door within it to move, much less strike something to cause a noise, unless the actuator has initiated that movement. However, if part of a door had broken and was no longer firmly set with its actuator then this noise could be generated as a result of that from within the HVAC case.

Perhaps something else in the area is making contact with the case. Inspecting this will be a challenge. Keep us posted.

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