Question about 2003 Lincoln Aviator

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2004 Lincoln Aviator thumping sound

Behind left rear wheel there is a continual thumping sound that seems associated with the airconditioning system. This is all wheel drive and was their top of the line Aviator, if that adds any info or equipment. Everything seems to work ok except for the noise. It appears that turning the a/c up increases the volume but not the frequency of the thumping. This noise is whether stopped or moving.

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The problem is the rear thermostatic expansion valve (TXV).
It is behind the left rear quarter trim panel.You can pull the panel back to access the valve to make sure that that is the noise.If so you will nedd to have AC system evacuated and replace valve and recharge the system. The part number is YF2Z-19849-AA.

Posted on Mar 04, 2009

  • teddz1 Dec 10, 2010

    where is the "left rear quarter trim panel"?


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The problem is more than likely the blend door motor. Seems to be a common problem with these models.

Posted on Nov 05, 2009

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