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Discussion Starter · #1 ·
I have a 2016 Tundra and just yesterday I noticed that when the defrost is on high and spools up to maximum a fairly loud harmonic sound can be heard from behind the dash. Has anyone else noticed this? It only happens when the system is set to defrost and the fan is at maximum. It's a minor irritation, but it's weird. It didn't happen on my 2009.
 
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